synced samples

52 files changed, 2618 insertions, 0 deletions

diff --git a/samples/99_genre_platformer/the_little_probe/app/main.rb b/samples/99_genre_platformer/the_little_probe/app/main.rb
new file mode 100644
index 0000000..1c90218
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/app/main.rb
@@ -0,0 +1,887 @@
+class FallingCircle
+  attr_gtk
+
+  def tick
+    fiddle
+    defaults
+    render
+    input
+    calc
+  end
+
+  def fiddle
+    state.gravity     = -0.02
+    circle.radius     = 15
+    circle.elasticity = 0.4
+    camera.follow_speed = 0.4 * 0.4
+  end
+
+  def render
+    render_stage_editor
+    render_debug
+    render_game
+  end
+
+  def defaults
+    if state.tick_count == 0
+      outputs.sounds << "sounds/bg.ogg"
+    end
+
+    state.storyline ||= [
+      { text: "<- -> to aim, hold space to charge",                            distance_gate: 0 },
+      { text: "the little probe - by @amirrajan, made with DragonRuby Game Toolkit", distance_gate: 0 },
+      { text: "mission control, this is sasha. landing on europa successful.", distance_gate: 0 },
+      { text: "operation \"find earth 2.0\", initiated at 8-29-2036 14:00.",   distance_gate: 0 },
+      { text: "jupiter's sure is beautiful...",   distance_gate: 4000 },
+      { text: "hmm, it seems there's some kind of anomoly in the sky",   distance_gate: 7000 },
+      { text: "dancing lights, i'll call them whisps.",   distance_gate: 8000 },
+      { text: "#todo... look i ran out of time -_-",   distance_gate: 9000 },
+      { text: "there's never enough time",   distance_gate: 9000 },
+      { text: "the game jam was fun though ^_^",   distance_gate: 10000 },
+    ]
+
+    load_level force: args.state.tick_count == 0
+    state.line_mode            ||= :terrain
+
+    state.sound_index          ||= 1
+    circle.potential_lift      ||= 0
+    circle.angle               ||= 90
+    circle.check_point_at      ||= -1000
+    circle.game_over_at        ||= -1000
+    circle.x                   ||= -485
+    circle.y                   ||= 12226
+    circle.check_point_x       ||= circle.x
+    circle.check_point_y       ||= circle.y
+    circle.dy                  ||= 0
+    circle.dx                  ||= 0
+    circle.previous_dy         ||= 0
+    circle.previous_dx         ||= 0
+    circle.angle               ||= 0
+    circle.after_images        ||= []
+    circle.terrains_to_monitor ||= {}
+    circle.impact_history      ||= []
+
+    camera.x                   ||= 0
+    camera.y                   ||= 0
+    camera.target_x            ||= 0
+    camera.target_y            ||= 0
+    state.snaps                ||= { }
+    state.snap_number            = 10
+
+    args.state.storyline_x ||= -1000
+    args.state.storyline_y ||= -1000
+  end
+
+  def render_game
+    outputs.background_color = [0, 0, 0]
+    outputs.sprites << [-circle.x + 1100,
+                        -circle.y - 100,
+                        2416 * 4,
+                        3574 * 4,
+                        'sprites/jupiter.png']
+    outputs.sprites << [-circle.x,
+                        -circle.y,
+                        2416 * 4,
+                        3574 * 4,
+                        'sprites/level.png']
+    outputs.sprites << state.whisp_queue
+    render_aiming_retical
+    render_circle
+    render_notification
+  end
+
+  def render_notification
+    toast_length = 500
+    if circle.game_over_at.elapsed_time < toast_length
+      label_text = "..."
+    elsif circle.check_point_at.elapsed_time > toast_length
+      args.state.current_storyline = nil
+      return
+    end
+    if circle.check_point_at &&
+       circle.check_point_at.elapsed_time == 1 &&
+       !args.state.current_storyline
+       if args.state.storyline.length > 0 && args.state.distance_traveled > args.state.storyline[0][:distance_gate]
+         args.state.current_storyline = args.state.storyline.shift[:text]
+         args.state.distance_traveled ||= 0
+         args.state.storyline_x = circle.x
+         args.state.storyline_y = circle.y
+       end
+      return unless args.state.current_storyline
+    end
+    label_text = args.state.current_storyline
+    return unless label_text
+    x = circle.x + camera.x
+    y = circle.y + camera.y - 40
+    w = 900
+    h = 30
+    outputs.primitives << [x - w.idiv(2), y - h, w, h, 255, 255, 255, 255].solid
+    outputs.primitives << [x - w.idiv(2), y - h, w, h, 0, 0, 0, 255].border
+    outputs.labels << [x, y - 4, label_text, 1, 1, 0, 0, 0, 255]
+  end
+
+  def render_aiming_retical
+    outputs.sprites << [state.camera.x + circle.x + circle.angle.vector_x(circle.potential_lift * 10) - 5,
+                        state.camera.y + circle.y + circle.angle.vector_y(circle.potential_lift * 10) - 5,
+                        10, 10, 'sprites/circle-orange.png']
+    outputs.sprites << [state.camera.x + circle.x + circle.angle.vector_x(circle.radius * 3) - 5,
+                        state.camera.y + circle.y + circle.angle.vector_y(circle.radius * 3) - 5,
+                        10, 10, 'sprites/circle-orange.png', 0, 128]
+    if rand > 0.9
+      outputs.sprites << [state.camera.x + circle.x + circle.angle.vector_x(circle.radius * 3) - 5,
+                          state.camera.y + circle.y + circle.angle.vector_y(circle.radius * 3) - 5,
+                          10, 10, 'sprites/circle-white.png', 0, 128]
+    end
+  end
+
+  def render_circle
+    outputs.sprites << circle.after_images.map do |ai|
+      ai.merge(x: ai.x + state.camera.x - circle.radius,
+               y: ai.y + state.camera.y - circle.radius,
+               w: circle.radius * 2,
+               h: circle.radius * 2,
+               path: 'sprites/circle-white.png')
+    end
+
+    outputs.sprites << [(circle.x - circle.radius) + state.camera.x,
+                        (circle.y - circle.radius) + state.camera.y,
+                        circle.radius * 2,
+                        circle.radius * 2,
+                        'sprites/probe.png']
+  end
+
+  def render_debug
+    return unless state.debug_mode
+
+    outputs.labels << [10, 30, state.line_mode, 0, 0, 0, 0, 0]
+    outputs.labels << [12, 32, state.line_mode, 0, 0, 255, 255, 255]
+
+    args.outputs.lines << trajectory(circle).line.to_hash.tap do |h|
+      h[:x] += state.camera.x
+      h[:y] += state.camera.y
+      h[:x2] += state.camera.x
+      h[:y2] += state.camera.y
+    end
+
+    outputs.primitives << state.terrain.find_all do |t|
+      circle.x.between?(t.x - 640, t.x2 + 640) || circle.y.between?(t.y - 360, t.y2 + 360)
+    end.map do |t|
+      [
+        t.line.associate(r: 0, g: 255, b: 0) do |h|
+          h.x  += state.camera.x
+          h.y  += state.camera.y
+          h.x2 += state.camera.x
+          h.y2 += state.camera.y
+          if circle.rect.intersect_rect? t[:rect]
+            h[:r] = 255
+            h[:g] = 0
+          end
+          h
+        end,
+        t[:rect].border.associate(r: 255, g: 0, b: 0) do |h|
+          h.x += state.camera.x
+          h.y += state.camera.y
+          h.b = 255 if line_near_rect? circle.rect, t
+          h
+        end
+      ]
+    end
+
+    outputs.primitives << state.lava.find_all do |t|
+      circle.x.between?(t.x - 640, t.x2 + 640) || circle.y.between?(t.y - 360, t.y2 + 360)
+    end.map do |t|
+      [
+        t.line.associate(r: 0, g: 0, b: 255) do |h|
+          h.x  += state.camera.x
+          h.y  += state.camera.y
+          h.x2 += state.camera.x
+          h.y2 += state.camera.y
+          if circle.rect.intersect_rect? t[:rect]
+            h[:r] = 255
+            h[:b] = 0
+          end
+          h
+        end,
+        t[:rect].border.associate(r: 255, g: 0, b: 0) do |h|
+          h.x += state.camera.x
+          h.y += state.camera.y
+          h.b = 255 if line_near_rect? circle.rect, t
+          h
+        end
+      ]
+    end
+
+    if state.god_mode
+      border = circle.rect.merge(x: circle.rect.x + state.camera.x,
+                                 y: circle.rect.y + state.camera.y,
+                                 g: 255)
+    else
+      border = circle.rect.merge(x: circle.rect.x + state.camera.x,
+                                 y: circle.rect.y + state.camera.y,
+                                 b: 255)
+    end
+
+    outputs.borders << border
+
+    overlapping ||= {}
+
+    circle.impact_history.each do |h|
+      label_mod = 300
+      x = (h[:body][:x].-(150).idiv(label_mod)) * label_mod + camera.x
+      y = (h[:body][:y].+(150).idiv(label_mod)) * label_mod + camera.y
+      10.times do
+        if overlapping[x] && overlapping[x][y]
+          y -= 52
+        else
+          break
+        end
+      end
+
+      overlapping[x] ||= {}
+      overlapping[x][y] ||= true
+      outputs.primitives << [x, y - 25, 300, 50, 0, 0, 0, 128].solid
+      outputs.labels << [x + 10, y + 24, "dy: %.2f" % h[:body][:new_dy], -2, 0, 255, 255, 255]
+      outputs.labels << [x + 10, y +  9, "dx: %.2f" % h[:body][:new_dx], -2, 0, 255, 255, 255]
+      outputs.labels << [x + 10, y -  5, " ?: #{h[:body][:new_reason]}", -2, 0, 255, 255, 255]
+
+      outputs.labels << [x + 100, y + 24, "angle: %.2f" % h[:impact][:angle], -2, 0, 255, 255, 255]
+      outputs.labels << [x + 100, y + 9, "m(l): %.2f" % h[:terrain][:slope], -2, 0, 255, 255, 255]
+      outputs.labels << [x + 100, y - 5, "m(c): %.2f" % h[:body][:slope], -2, 0, 255, 255, 255]
+
+      outputs.labels << [x + 200, y + 24, "ray: #{h[:impact][:ray]}", -2, 0, 255, 255, 255]
+      outputs.labels << [x + 200, y +  9, "nxt: #{h[:impact][:ray_next]}", -2, 0, 255, 255, 255]
+      outputs.labels << [x + 200, y -  5, "typ: #{h[:impact][:type]}", -2, 0, 255, 255, 255]
+    end
+
+    if circle.floor
+      outputs.labels << [circle.x + camera.x + 30, circle.y + camera.y + 100, "point: #{circle.floor_point.slice(:x, :y).values}", -2, 0]
+      outputs.labels << [circle.x + camera.x + 31, circle.y + camera.y + 101, "point: #{circle.floor_point.slice(:x, :y).values}", -2, 0, 255, 255, 255]
+      outputs.labels << [circle.x + camera.x + 30, circle.y + camera.y +  85, "circle: #{circle.hash.slice(:x, :y).values}", -2, 0]
+      outputs.labels << [circle.x + camera.x + 31, circle.y + camera.y +  86, "circle: #{circle.hash.slice(:x, :y).values}", -2, 0, 255, 255, 255]
+      outputs.labels << [circle.x + camera.x + 30, circle.y + camera.y +  70, "rel: #{circle.floor_relative_x} #{circle.floor_relative_y}", -2, 0]
+      outputs.labels << [circle.x + camera.x + 31, circle.y + camera.y +  71, "rel: #{circle.floor_relative_x} #{circle.floor_relative_y}", -2, 0, 255, 255, 255]
+    end
+  end
+
+  def render_stage_editor
+    return unless state.god_mode
+    return unless state.point_one
+    args.lines << [state.point_one, inputs.mouse.point, 0, 255, 255]
+  end
+
+  def trajectory body
+    [body.x + body.dx,
+     body.y + body.dy,
+     body.x + body.dx * 1000,
+     body.y + body.dy * 1000,
+     0, 255, 255]
+  end
+
+  def lengthen_line line, num
+    line = normalize_line(line)
+    slope = geometry.line_slope(line, replace_infinity: 10).abs
+    if slope < 2
+      [line.x - num, line.y, line.x2 + num, line.y2].line.to_hash
+    else
+      [line.x, line.y, line.x2, line.y2].line.to_hash
+    end
+  end
+
+  def normalize_line line
+    if line.x > line.x2
+      x  = line.x2
+      y  = line.y2
+      x2 = line.x
+      y2 = line.y
+    else
+      x  = line.x
+      y  = line.y
+      x2 = line.x2
+      y2 = line.y2
+    end
+    [x, y, x2, y2]
+  end
+
+  def rect_for_line line
+    if line.x > line.x2
+      x  = line.x2
+      y  = line.y2
+      x2 = line.x
+      y2 = line.y
+    else
+      x  = line.x
+      y  = line.y
+      x2 = line.x2
+      y2 = line.y2
+    end
+
+    w = x2 - x
+    h = y2 - y
+
+    if h < 0
+      y += h
+      h = h.abs
+    end
+
+    if w < circle.radius
+      x -= circle.radius
+      w = circle.radius * 2
+    end
+
+    if h < circle.radius
+      y -= circle.radius
+      h = circle.radius * 2
+    end
+
+    { x: x, y: y, w: w, h: h }
+  end
+
+  def snap_to_grid x, y, snaps
+    snap_number = 10
+    x = x.to_i
+    y = y.to_i
+
+    x_floor = x.idiv(snap_number) * snap_number
+    x_mod   = x % snap_number
+    x_ceil  = (x.idiv(snap_number) + 1) * snap_number
+
+    y_floor = y.idiv(snap_number) * snap_number
+    y_mod   = y % snap_number
+    y_ceil  = (y.idiv(snap_number) + 1) * snap_number
+
+    if snaps[x_floor]
+      x_result = x_floor
+    elsif snaps[x_ceil]
+      x_result = x_ceil
+    elsif x_mod < snap_number.idiv(2)
+      x_result = x_floor
+    else
+      x_result = x_ceil
+    end
+
+    snaps[x_result] ||= {}
+
+    if snaps[x_result][y_floor]
+      y_result = y_floor
+    elsif snaps[x_result][y_ceil]
+      y_result = y_ceil
+    elsif y_mod < snap_number.idiv(2)
+      y_result = y_floor
+    else
+      y_result = y_ceil
+    end
+
+    snaps[x_result][y_result] = true
+    return [x_result, y_result]
+
+  end
+
+  def snap_line line
+    x, y, x2, y2 = line
+  end
+
+  def string_to_line s
+    x, y, x2, y2 = s.split(',').map(&:to_f)
+
+    if x > x2
+      x2, x = x, x2
+      y2, y = y, y2
+    end
+
+    x, y = snap_to_grid x, y, state.snaps
+    x2, y2 = snap_to_grid x2, y2, state.snaps
+    [x, y, x2, y2].line.to_hash
+  end
+
+  def load_lines file
+    data = gtk.read_file(file) || ""
+    data.each_line
+        .reject { |l| l.strip.length == 0 }
+        .map { |l| string_to_line l }
+        .map { |h| h.merge(rect: rect_for_line(h))  }
+  end
+
+  def load_terrain
+    load_lines 'level.txt'
+  end
+
+  def load_lava
+    load_lines 'level_lava.txt'
+  end
+
+  def load_level force: false
+    if force
+      state.snaps = {}
+      state.terrain = load_terrain
+      state.lava = load_lava
+    else
+      state.terrain ||= load_terrain
+      state.lava ||= load_lava
+    end
+  end
+
+  def save_lines lines, file
+    s = lines.map do |l|
+      "#{l.x1},#{l.y1},#{l.x2},#{l.y2}"
+    end.join("\n")
+    gtk.write_file(file, s)
+  end
+
+  def save_level
+    save_lines(state.terrain, 'level.txt')
+    save_lines(state.lava, 'level_lava.txt')
+    load_level force: true
+  end
+
+  def line_near_rect? rect, terrain
+    geometry.intersect_rect?(rect, terrain[:rect])
+  end
+
+  def point_within_line? point, line
+    return false if !point
+    return false if !line
+    return true
+  end
+
+  def calc_impacts x, dx, y, dy, radius
+    results = { }
+    results[:x] = x
+    results[:y] = y
+    results[:dx] = x
+    results[:dy] = y
+    results[:point] = { x: x, y: y }
+    results[:rect] = { x: x - radius, y: y - radius, w: radius * 2, h: radius * 2 }
+    results[:trajectory] = trajectory(results)
+    results[:impacts] = terrain.find_all { |t| line_near_rect? results[:rect], t }.map do |t|
+      {
+        terrain: t,
+        point: geometry.line_intersect(results[:trajectory], t),
+        type: :terrain
+      }
+    end.reject { |t| !point_within_line? t[:point], t[:terrain] }
+
+    results[:impacts] += lava.find_all { |t| line_near_rect? results[:rect], t }.map do |t|
+      {
+        terrain: t,
+        point: geometry.line_intersect(results[:trajectory], t),
+        type: :lava
+      }
+    end.reject { |t| !point_within_line? t[:point], t[:terrain] }
+
+    results
+  end
+
+  def calc_potential_impacts
+    impact_results = calc_impacts circle.x, circle.dx, circle.y, circle.dy, circle.radius
+    circle.rect = impact_results[:rect]
+    circle.trajectory = impact_results[:trajectory]
+    circle.impacts = impact_results[:impacts]
+  end
+
+  def calc_terrains_to_monitor
+    circle.impact = nil
+    circle.impacts.each do |i|
+      circle.terrains_to_monitor[i[:terrain]] ||= {
+        ray_start: geometry.ray_test(circle, i[:terrain]),
+      }
+
+      circle.terrains_to_monitor[i[:terrain]][:ray_current] = geometry.ray_test(circle, i[:terrain])
+      if circle.terrains_to_monitor[i[:terrain]][:ray_start] != circle.terrains_to_monitor[i[:terrain]][:ray_current]
+        if circle.x.between?(i[:terrain].x, i[:terrain].x2) || circle.y.between?(i[:terrain].y, i[:terrain].y2)
+          circle.impact = i
+          circle.ray_current = circle.terrains_to_monitor[i[:terrain]][:ray_current]
+        end
+      end
+    end
+  end
+
+  def impact_result body, impact
+    infinity_alias = 1000
+    r = {
+      body: {},
+      terrain: {},
+      impact: {}
+    }
+
+    r[:body][:line] = body.trajectory.dup
+    r[:body][:slope] = geometry.line_slope(body.trajectory, replace_infinity: infinity_alias)
+    r[:body][:slope_sign] = r[:body][:slope].sign
+    r[:body][:x] = body.x
+    r[:body][:y] = body.y
+    r[:body][:dy] = body.dy
+    r[:body][:dx] = body.dx
+
+    r[:terrain][:line] = impact[:terrain].dup
+    r[:terrain][:slope] = geometry.line_slope(impact[:terrain], replace_infinity: infinity_alias)
+    r[:terrain][:slope_sign] = r[:terrain][:slope].sign
+
+    r[:impact][:angle] = geometry.angle_between_lines(body.trajectory, impact[:terrain], replace_infinity: infinity_alias)
+    r[:impact][:point] = { x: impact[:point].x, y: impact[:point].y }
+    r[:impact][:same_slope_sign] = r[:body][:slope_sign] == r[:terrain][:slope_sign]
+    r[:impact][:ray] = body.ray_current
+    r[:body][:new_on_floor] = body.on_floor
+    r[:body][:new_floor] = r[:terrain][:line]
+
+    if r[:impact][:angle].abs < 90 && r[:terrain][:slope].abs < 3
+      play_sound
+      r[:body][:new_dy] = r[:body][:dy] * circle.elasticity * -1
+      r[:body][:new_dx] = r[:body][:dx] * circle.elasticity
+      r[:impact][:type] = :horizontal
+      r[:body][:new_reason] = "-"
+    elsif r[:impact][:angle].abs < 90 && r[:terrain][:slope].abs > 3
+      play_sound
+      r[:body][:new_dy] = r[:body][:dy] * 1.1
+      r[:body][:new_dx] = r[:body][:dx] * -circle.elasticity
+      r[:impact][:type] = :vertical
+      r[:body][:new_reason] = "|"
+    else
+      play_sound
+      r[:body][:new_dx] = r[:body][:dx] * -circle.elasticity
+      r[:body][:new_dy] = r[:body][:dy] * -circle.elasticity
+      r[:impact][:type] = :slanted
+      r[:body][:new_reason] = "/"
+    end
+
+    r[:impact][:energy] = r[:body][:new_dx].abs + r[:body][:new_dy].abs
+
+    if r[:impact][:energy] <= 0.3 && r[:terrain][:slope].abs < 4
+      r[:body][:new_dx] = 0
+      r[:body][:new_dy] = 0
+      r[:impact][:energy] = 0
+      r[:body][:new_on_floor] = true
+      r[:body][:new_floor] = r[:terrain][:line]
+      r[:body][:new_reason] = "0"
+    end
+
+    r[:impact][:ray_next] = geometry.ray_test({ x: r[:body][:x] - (r[:body][:dx] * 1.1) + r[:body][:new_dx],
+                                                y: r[:body][:y] - (r[:body][:dy] * 1.1) + r[:body][:new_dy] + state.gravity },
+                                              r[:terrain][:line])
+
+    if r[:impact][:ray_next] == r[:impact][:ray]
+      r[:body][:new_dx] *= -1
+      r[:body][:new_dy] *= -1
+      r[:body][:new_reason] = "clip"
+    end
+
+    r
+  end
+
+  def game_over!
+    circle.x = circle.check_point_x
+    circle.y = circle.check_point_y
+    circle.dx = 0
+    circle.dy = 0
+    circle.game_over_at = state.tick_count
+  end
+
+  def not_game_over!
+    impact_history_entry = impact_result circle, circle.impact
+    circle.impact_history << impact_history_entry
+    circle.x -= circle.dx * 1.1
+    circle.y -= circle.dy * 1.1
+    circle.dx = impact_history_entry[:body][:new_dx]
+    circle.dy = impact_history_entry[:body][:new_dy]
+    circle.on_floor = impact_history_entry[:body][:new_on_floor]
+
+    if circle.on_floor
+      circle.check_point_at = state.tick_count
+      circle.check_point_x = circle.x
+      circle.check_point_y = circle.y
+    end
+
+    circle.previous_floor = circle.floor || {}
+    circle.floor = impact_history_entry[:body][:new_floor] || {}
+    circle.floor_point = impact_history_entry[:impact][:point]
+    if circle.floor.slice(:x, :y, :x2, :y2) != circle.previous_floor.slice(:x, :y, :x2, :y2)
+      new_relative_x = if circle.dx > 0
+                         :right
+                       elsif circle.dx < 0
+                         :left
+                       else
+                         nil
+                       end
+
+      new_relative_y = if circle.dy > 0
+                         :above
+                       elsif circle.dy < 0
+                         :below
+                       else
+                         nil
+                       end
+
+      circle.floor_relative_x = new_relative_x
+      circle.floor_relative_y = new_relative_y
+    end
+
+    circle.impact = nil
+    circle.terrains_to_monitor.clear
+  end
+
+  def calc_physics
+    if args.state.god_mode
+      calc_potential_impacts
+      calc_terrains_to_monitor
+      return
+    end
+
+    if circle.y < -700
+      game_over
+      return
+    end
+
+    return if state.game_over
+    return if circle.on_floor
+    circle.previous_dy = circle.dy
+    circle.previous_dx = circle.dx
+    circle.x  += circle.dx
+    circle.y  += circle.dy
+    args.state.distance_traveled ||= 0
+    args.state.distance_traveled += circle.dx.abs + circle.dy.abs
+    circle.dy += state.gravity
+    calc_potential_impacts
+    calc_terrains_to_monitor
+    return unless circle.impact
+    if circle.impact && circle.impact[:type] == :lava
+      game_over!
+    else
+      not_game_over!
+    end
+  end
+
+  def input_god_mode
+    state.debug_mode = !state.debug_mode if inputs.keyboard.key_down.forward_slash
+
+    # toggle god mode
+    if inputs.keyboard.key_down.g
+      state.god_mode = !state.god_mode
+      state.potential_lift = 0
+      circle.floor = nil
+      circle.floor_point = nil
+      circle.floor_relative_x = nil
+      circle.floor_relative_y = nil
+      circle.impact = nil
+      circle.terrains_to_monitor.clear
+      return
+    end
+
+    return unless state.god_mode
+
+    circle.x = circle.x.to_i
+    circle.y = circle.y.to_i
+
+    # move god circle
+    if inputs.keyboard.left || inputs.keyboard.a
+      circle.x -= 20
+    elsif inputs.keyboard.right || inputs.keyboard.d || inputs.keyboard.f
+      circle.x += 20
+    end
+
+    if inputs.keyboard.up || inputs.keyboard.w
+      circle.y += 20
+    elsif inputs.keyboard.down || inputs.keyboard.s
+      circle.y -= 20
+    end
+
+    # delete terrain
+    if inputs.keyboard.key_down.x
+      calc_terrains_to_monitor
+      state.terrain = state.terrain.reject do |t|
+        t[:rect].intersect_rect? circle.rect
+      end
+
+      state.lava = state.lava.reject do |t|
+        t[:rect].intersect_rect? circle.rect
+      end
+
+      calc_potential_impacts
+      save_level
+    end
+
+    # change terrain type
+    if inputs.keyboard.key_down.l
+      if state.line_mode == :terrain
+        state.line_mode = :lava
+      else
+        state.line_mode = :terrain
+      end
+    end
+
+    if inputs.mouse.click && !state.point_one
+      state.point_one = inputs.mouse.click.point
+    elsif inputs.mouse.click && state.point_one
+      l = [*state.point_one, *inputs.mouse.click.point]
+      l = [l.x  - state.camera.x,
+           l.y  - state.camera.y,
+           l.x2 - state.camera.x,
+           l.y2 - state.camera.y].line.to_hash
+      l[:rect] = rect_for_line l
+      if state.line_mode == :terrain
+        state.terrain << l
+      else
+        state.lava << l
+      end
+      save_level
+      next_x = inputs.mouse.click.point.x - 640
+      next_y = inputs.mouse.click.point.y - 360
+      circle.x += next_x
+      circle.y += next_y
+      state.point_one = nil
+    elsif inputs.keyboard.one
+      state.point_one = [circle.x + camera.x, circle.y+ camera.y]
+    end
+
+    # cancel chain lines
+    if inputs.keyboard.key_down.nine || inputs.keyboard.key_down.escape || inputs.keyboard.key_up.six || inputs.keyboard.key_up.one
+      state.point_one = nil
+    end
+  end
+
+  def play_sound
+    return if state.sound_debounce > 0
+    state.sound_debounce = 5
+    outputs.sounds << "sounds/03#{"%02d" % state.sound_index}.wav"
+    state.sound_index += 1
+    if state.sound_index > 21
+      state.sound_index = 1
+    end
+  end
+
+  def input_game
+    if inputs.keyboard.down || inputs.keyboard.space
+      circle.potential_lift += 0.03
+      circle.potential_lift = circle.potential_lift.lesser(10)
+    elsif inputs.keyboard.key_up.down || inputs.keyboard.key_up.space
+      play_sound
+      circle.dy += circle.angle.vector_y circle.potential_lift
+      circle.dx += circle.angle.vector_x circle.potential_lift
+
+      if circle.on_floor
+        if circle.floor_relative_y == :above
+          circle.y += circle.potential_lift.abs * 2
+        elsif circle.floor_relative_y == :below
+          circle.y -= circle.potential_lift.abs * 2
+        end
+      end
+
+      circle.on_floor = false
+      circle.potential_lift = 0
+      circle.terrains_to_monitor.clear
+      circle.impact_history.clear
+      circle.impact = nil
+      calc_physics
+    end
+
+    # aim probe
+    if inputs.keyboard.right || inputs.keyboard.a
+      circle.angle -= 2
+    elsif inputs.keyboard.left || inputs.keyboard.d
+      circle.angle += 2
+    end
+  end
+
+  def input
+    input_god_mode
+    input_game
+  end
+
+  def calc_camera
+    state.camera.target_x = 640 - circle.x
+    state.camera.target_y = 360 - circle.y
+    xdiff = state.camera.target_x - state.camera.x
+    ydiff = state.camera.target_y - state.camera.y
+    state.camera.x += xdiff * camera.follow_speed
+    state.camera.y += ydiff * camera.follow_speed
+  end
+
+  def calc
+    state.sound_debounce ||= 0
+    state.sound_debounce -= 1
+    state.sound_debounce = 0 if state.sound_debounce < 0
+    if state.god_mode
+      circle.dy *= 0.1
+      circle.dx *= 0.1
+    end
+    calc_camera
+    state.whisp_queue ||= []
+    if state.tick_count.mod_zero?(4)
+      state.whisp_queue << {
+        x: -300,
+        y: 1400 * rand,
+        speed: 2.randomize(:ratio) + 3,
+        w: 20,
+        h: 20, path: 'sprites/whisp.png',
+        a: 0,
+        created_at: state.tick_count,
+        angle: 0,
+        r: 100,
+        g: 128 + 128 * rand,
+        b: 128 + 128 * rand
+      }
+    end
+
+    state.whisp_queue.each do |w|
+      w.x += w[:speed] * 2
+      w.x -= circle.dx * 0.3
+      w.y -= w[:speed]
+      w.y -= circle.dy * 0.3
+      w.angle += w[:speed]
+      w.a = w[:created_at].ease(30) * 255
+    end
+
+    state.whisp_queue = state.whisp_queue.reject { |w| w[:x] > 1280 }
+
+    if state.tick_count.mod_zero?(2) && (circle.dx != 0 || circle.dy != 0)
+      circle.after_images << {
+        x: circle.x,
+        y: circle.y,
+        w: circle.radius,
+        h: circle.radius,
+        a: 255,
+        created_at: state.tick_count
+      }
+    end
+
+    circle.after_images.each do |ai|
+      ai.a = ai[:created_at].ease(10, :flip) * 255
+    end
+
+    circle.after_images = circle.after_images.reject { |ai| ai[:created_at].elapsed_time > 10 }
+    calc_physics
+  end
+
+  def circle
+    state.circle
+  end
+
+  def camera
+    state.camera
+  end
+
+  def terrain
+    state.terrain
+  end
+
+  def lava
+    state.lava
+  end
+end
+
+# $gtk.reset
+
+def tick args
+  args.outputs.background_color = [0, 0, 0]
+  if args.inputs.keyboard.r
+    args.gtk.reset
+    return
+  end
+  # uncomment the line below to slow down the game so you
+  # can see each tick as it passes
+  # args.gtk.slowmo! 30
+  $game ||= FallingCircle.new
+  $game.args = args
+  $game.tick
+end
+
+def reset
+  $game = nil
+end
diff --git a/samples/99_genre_platformer/the_little_probe/level.txt b/samples/99_genre_platformer/the_little_probe/level.txt
new file mode 100644
index 0000000..62caf2d
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/level.txt
@@ -0,0 +1,1481 @@
+640,8840,1180,8840
+-60,10220,0,9960
+-60,10220,0,10500
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+100,11120,240,11100
+0,11180,100,11120
+-160,11220,0,11180
+-260,11240,-160,11220
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+960,13300,1280,13060
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+0,9700,0,9960
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\ No newline at end of file
diff --git a/samples/99_genre_platformer/the_little_probe/level_lava.txt b/samples/99_genre_platformer/the_little_probe/level_lava.txt
new file mode 100644
index 0000000..e2bc2bd
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/level_lava.txt
@@ -0,0 +1,235 @@
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\ No newline at end of file
diff --git a/samples/99_genre_platformer/the_little_probe/license-for-sample.txt b/samples/99_genre_platformer/the_little_probe/license-for-sample.txt
new file mode 100644
index 0000000..b1005ed
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/license-for-sample.txt
@@ -0,0 +1,9 @@
+Copyright 2019 DragonRuby LLC, Amir Rajan
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/samples/99_genre_platformer/the_little_probe/metadata/game_metadata.txt b/samples/99_genre_platformer/the_little_probe/metadata/game_metadata.txt
new file mode 100644
index 0000000..cba2788
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/metadata/game_metadata.txt
@@ -0,0 +1,6 @@
+devid=amirrajan
+devtitle=Amir Rajan
+gameid=the-little-probe
+gametitle=The Little Probe
+version=1.0
+icon=sprites/probe.png
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0301.wav b/samples/99_genre_platformer/the_little_probe/sounds/0301.wav
new file mode 100644
index 0000000..13bdf5a
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0301.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0302.wav b/samples/99_genre_platformer/the_little_probe/sounds/0302.wav
new file mode 100644
index 0000000..b3e5849
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0302.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0303.wav b/samples/99_genre_platformer/the_little_probe/sounds/0303.wav
new file mode 100644
index 0000000..0871983
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0303.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0304.wav b/samples/99_genre_platformer/the_little_probe/sounds/0304.wav
new file mode 100644
index 0000000..9ee599e
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0304.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0305.wav b/samples/99_genre_platformer/the_little_probe/sounds/0305.wav
new file mode 100644
index 0000000..d2f919f
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0305.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0306.wav b/samples/99_genre_platformer/the_little_probe/sounds/0306.wav
new file mode 100644
index 0000000..4f15476
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0306.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0307.wav b/samples/99_genre_platformer/the_little_probe/sounds/0307.wav
new file mode 100644
index 0000000..ffb55f9
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0307.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0308.wav b/samples/99_genre_platformer/the_little_probe/sounds/0308.wav
new file mode 100644
index 0000000..86cae87
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0308.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0309.wav b/samples/99_genre_platformer/the_little_probe/sounds/0309.wav
new file mode 100644
index 0000000..1dd2a65
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0309.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0310.wav b/samples/99_genre_platformer/the_little_probe/sounds/0310.wav
new file mode 100644
index 0000000..cc0df6f
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0310.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0311.wav b/samples/99_genre_platformer/the_little_probe/sounds/0311.wav
new file mode 100644
index 0000000..0e85a2d
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0311.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0312.wav b/samples/99_genre_platformer/the_little_probe/sounds/0312.wav
new file mode 100644
index 0000000..0680440
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0312.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0313.wav b/samples/99_genre_platformer/the_little_probe/sounds/0313.wav
new file mode 100644
index 0000000..466851b
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0313.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0314.wav b/samples/99_genre_platformer/the_little_probe/sounds/0314.wav
new file mode 100644
index 0000000..81784c6
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0314.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0315.wav b/samples/99_genre_platformer/the_little_probe/sounds/0315.wav
new file mode 100644
index 0000000..f6d0036
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0315.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0316.wav b/samples/99_genre_platformer/the_little_probe/sounds/0316.wav
new file mode 100644
index 0000000..942c6d3
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0316.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0317.wav b/samples/99_genre_platformer/the_little_probe/sounds/0317.wav
new file mode 100644
index 0000000..75e35ed
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0317.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0318.wav b/samples/99_genre_platformer/the_little_probe/sounds/0318.wav
new file mode 100644
index 0000000..1fff907
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0318.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0319.wav b/samples/99_genre_platformer/the_little_probe/sounds/0319.wav
new file mode 100644
index 0000000..016a76f
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0319.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0320.wav b/samples/99_genre_platformer/the_little_probe/sounds/0320.wav
new file mode 100644
index 0000000..a41bafe
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0320.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/0321.wav b/samples/99_genre_platformer/the_little_probe/sounds/0321.wav
new file mode 100644
index 0000000..dede4f1
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/0321.wav
diff --git a/samples/99_genre_platformer/the_little_probe/sounds/bg.ogg b/samples/99_genre_platformer/the_little_probe/sounds/bg.ogg
new file mode 100644
index 0000000..8a02a75
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sounds/bg.ogg
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/area_one.png b/samples/99_genre_platformer/the_little_probe/sprites/area_one.png
new file mode 100644
index 0000000..afd2f46
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/area_one.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-black.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-black.png
new file mode 100644
index 0000000..c98e23d
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-black.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-blue.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-blue.png
new file mode 100644
index 0000000..1726d2a
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-blue.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-gray.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-gray.png
new file mode 100644
index 0000000..960f191
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-gray.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-green.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-green.png
new file mode 100644
index 0000000..43cf7ee
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-green.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-indigo.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-indigo.png
new file mode 100644
index 0000000..598e240
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-indigo.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-orange.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-orange.png
new file mode 100644
index 0000000..5604a42
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-orange.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-red.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-red.png
new file mode 100644
index 0000000..7f17ca6
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-red.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-violet.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-violet.png
new file mode 100644
index 0000000..681d210
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-violet.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-white.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-white.png
new file mode 100644
index 0000000..bd32155
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-white.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/circle-yellow.png b/samples/99_genre_platformer/the_little_probe/sprites/circle-yellow.png
new file mode 100644
index 0000000..94992eb
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/circle-yellow.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/jupiter.png b/samples/99_genre_platformer/the_little_probe/sprites/jupiter.png
new file mode 100644
index 0000000..7982713
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/jupiter.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/level.png b/samples/99_genre_platformer/the_little_probe/sprites/level.png
new file mode 100644
index 0000000..1ce0f1a
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/level.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/probe.png b/samples/99_genre_platformer/the_little_probe/sprites/probe.png
new file mode 100644
index 0000000..e29b144
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/probe.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-black.png b/samples/99_genre_platformer/the_little_probe/sprites/square-black.png
new file mode 100644
index 0000000..cea7bd7
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-black.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-blue.png b/samples/99_genre_platformer/the_little_probe/sprites/square-blue.png
new file mode 100644
index 0000000..b840849
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-blue.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-gray.png b/samples/99_genre_platformer/the_little_probe/sprites/square-gray.png
new file mode 100644
index 0000000..2142b30
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-gray.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-green.png b/samples/99_genre_platformer/the_little_probe/sprites/square-green.png
new file mode 100644
index 0000000..5ef7f75
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-green.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-indigo.png b/samples/99_genre_platformer/the_little_probe/sprites/square-indigo.png
new file mode 100644
index 0000000..2384108
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-indigo.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-orange.png b/samples/99_genre_platformer/the_little_probe/sprites/square-orange.png
new file mode 100644
index 0000000..bb1eee7
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-orange.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-red.png b/samples/99_genre_platformer/the_little_probe/sprites/square-red.png
new file mode 100644
index 0000000..3ed5f13
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-red.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-violet.png b/samples/99_genre_platformer/the_little_probe/sprites/square-violet.png
new file mode 100644
index 0000000..333540c
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-violet.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-white.png b/samples/99_genre_platformer/the_little_probe/sprites/square-white.png
new file mode 100644
index 0000000..378c565
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-white.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/square-yellow.png b/samples/99_genre_platformer/the_little_probe/sprites/square-yellow.png
new file mode 100644
index 0000000..0edeeec
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/square-yellow.png
diff --git a/samples/99_genre_platformer/the_little_probe/sprites/whisp.png b/samples/99_genre_platformer/the_little_probe/sprites/whisp.png
new file mode 100644
index 0000000..07154ee
--- /dev/null
+++ b/samples/99_genre_platformer/the_little_probe/sprites/whisp.png