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3 files changed, 227 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..94ab5da
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
+
+# gem "rails"
+
+gem "ruby2d", "~> 0.10.0"
+
+gem "ruby2d-camera", "~> 1.1"
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 0000000..8b212cb
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,16 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ruby2d (0.10.0)
+    ruby2d-camera (1.1.0)
+      ruby2d (~> 0.10)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  ruby2d (~> 0.10.0)
+  ruby2d-camera (~> 1.1)
+
+BUNDLED WITH
+   2.2.22
diff --git a/run.rb b/run.rb
new file mode 100644
index 0000000..35f1860
--- /dev/null
+++ b/run.rb
@@ -0,0 +1,200 @@
+require 'ruby2d'
+require 'ruby2d/camera'
+
+$colors = ['blue', 'teal', 'green', 'lime',
+           'yellow', 'orange', 'red', 'fuchsia']
+
+class DebugLines
+  class <<self
+    def [](index)
+      data[index] ||= Camera::Line.new(color: 'red', z: 99, width: 5)
+    end
+
+    def data
+      @data ||= []
+    end
+  end
+end
+
+sv1 = {x1: 275.0 - 275.0, y1: 175.0 - 175.0,
+       x2: 375.0 - 275.0, y2: 225.0 - 175.0,
+       x3: 300.0 - 275.0, y3: 350.0 - 175.0,
+       x4: 250.0 - 275.0, y4: 250.0 - 175.0}
+
+sv2 = {x1: 200.0, y1: 100.0,
+       x2: 200.0, y2: 200.0,
+       x3: 100.0, y3: 200.0,
+       x4: 100.0, y4: 100.0}
+
+s1 = Camera::Quad.new(
+  **sv1,
+  color: 'aqua',
+  z: 10
+)
+
+s2 = Camera::Quad.new(
+  **sv2,
+  color: 'olive',
+  z: 10
+)
+
+def build_inverted_edges(shape)
+  edges = []
+  shape.each_with_index do |vertex_start, index|
+    if index == shape.length - 1
+      vertex_end = shape[0]
+    else
+      vertex_end = shape[index + 1]
+    end
+    edges.push [-vertex_end[1] + vertex_start[1],
+                -vertex_end[0] + vertex_start[0]]
+  end
+  edges
+end
+
+def vecDotProd(a,b)
+  return (a[0] * b[0]) + (a[1] * b[1])
+end
+
+def hitbox_check(shape_a, shape_b)
+  inverted = build_inverted_edges(shape_b)
+  inverted.concat(build_inverted_edges(shape_a))
+  pp inverted if $i == 0
+  amax = amin = bmin = bmax = nil
+
+  inverted.each_with_index do |line, line_index|
+    amin = vecDotProd(shape_a.first, line)
+    amax = vecDotProd(shape_a.first, line)
+    bmin = vecDotProd(shape_b.first, line)
+    bmax = vecDotProd(shape_b.first, line)
+
+    shape_a.each_with_index do |vertex, vertex_index|
+      dot = vecDotProd(vertex, line)
+      if dot > amax
+        amax = dot
+      elsif dot < amin
+        amin = dot
+      end
+    end
+
+    shape_b.each_with_index do |vertex, vertex_index|
+      dot = vecDotProd(vertex, line)
+      if dot > bmax
+        bmax = dot
+      elsif dot < bmin
+        bmin = dot
+      end
+    end
+
+    if line_index < shape_a.length
+      DebugLines[line_index].x1 = shape_a[line_index][0]
+      DebugLines[line_index].y1 = shape_a[line_index][1]
+      if shape_a[line_index].nil?
+        DebugLines[line_index].x2 = shape_a[line_index + 1][0]
+        DebugLines[line_index].y2 = shape_a[line_index + 1][1]
+      else
+        DebugLines[line_index].x2 = shape_a[0][0]
+        DebugLines[line_index].y2 = shape_a[0][1]
+      end
+    else
+      DebugLines[line_index].x1 = shape_b[line_index - shape_a.length][0]
+      DebugLines[line_index].y1 = shape_b[line_index - shape_a.length][1]
+      if shape_a[line_index - shape_a.length + 1].nil?
+        DebugLines[line_index].x2 = shape_b[0][0]
+        DebugLines[line_index].y2 = shape_b[0][1]
+      else
+        DebugLines[line_index].x2 = shape_b[line_index - shape_a.length + 1][0]
+        DebugLines[line_index].y2 = shape_b[line_index - shape_a.length + 1][1]
+      end
+    end
+    DebugLines[line_index].color = $colors[line_index % $colors.length]
+    if $i == 0
+      puts
+      puts $colors[line_index % $colors.length]
+      puts line_index
+      puts "x1 #{DebugLines[line_index].x1}"
+      puts "y1 #{DebugLines[line_index].y1}"
+      puts "x2 #{DebugLines[line_index].x2}"
+      puts "y2 #{DebugLines[line_index].y2}"
+      puts "(((#{amin} < #{bmax}) && (#{amin} > #{bmin})) || ((#{bmin} < #{amax}) && (#{bmin} > #{amin})))"
+    end
+    if (((amin <= bmax) && (amin >= bmin)) || ((bmin <= amax) && (bmin >= amin)))
+      DebugLines[line_index].color.a = 0.2# = 'red'
+      #next
+    else
+      DebugLines[line_index].color.a = 1.0# = 'green'
+      #return false
+    end
+    tempx1 = DebugLines[line_index].x1
+    tempx2 = DebugLines[line_index].x2
+    tempy1 = DebugLines[line_index].y1
+    tempy2 = DebugLines[line_index].y2
+
+    DebugLines[line_index].x1 = (tempx1 *(1+1000)/2) + (tempx2 * (1-1000)/2)
+    DebugLines[line_index].y1 = (tempy1 *(1+1000)/2) + (tempy2 * (1-1000)/2)
+    DebugLines[line_index].x2 = (tempx2 *(1+1000)/2) + (tempx1 * (1-1000)/2)
+    DebugLines[line_index].y2 = (tempy2 *(1+1000)/2) + (tempy1 * (1-1000)/2)
+  end
+  true
+end
+
+#puts "should be false: #{hitbox(@sqr1, @tri1)}"
+#puts "should be true:  #{hitbox(@sqr2, @tri2)}"
+
+on :key_held do |event|
+  if event.key == 'w'
+    Camera.y -= 5
+  end
+  if event.key == 's'
+    Camera.y += 5
+  end
+  if event.key == 'a'
+    Camera.x -= 5
+  end
+  if event.key == 'd'
+    Camera.x += 5
+  end
+end
+
+$i = 0
+
+#$line = Camera::Line.new(color: 'red',
+#                         width: 5, z: 99)
+
+update do
+  $i += 1
+  $i %= 5
+  s1.x = Camera.coordinate_to_worldspace(get(:mouse_x),0)[0]
+  s1.y = Camera.coordinate_to_worldspace(0, get(:mouse_y))[1]
+  $x = s1.x
+  $y = s1.y
+  a = hitbox_check(
+    [[s2.x1, s2.y1],
+     [s2.x2, s2.y2],
+     [s2.x3, s2.y3],
+     [s2.x4, s2.y4]],
+  [[s1.x1 + s1.x, s1.y1 + s1.y],
+   [s1.x2 + s1.x, s1.y2 + s1.y],
+   [s1.x3 + s1.x, s1.y3 + s1.y],
+   [s1.x4 + s1.x, s1.y4 + s1.y]],
+  )
+  if a
+    #s1.color = 'orange'
+  else
+    s1.color = 'aqua'
+  end
+  if $i == 0
+    pp [[s2.x1, s2.y1],
+        [s2.x2, s2.y2],
+        [s2.x3, s2.y3],
+        [s2.x4, s2.y4]]
+    pp [[s1.x1 + s1.x, s1.y1 + s1.y],
+        [s1.x2 + s1.x, s1.y2 + s1.y],
+        [s1.x3 + s1.x, s1.y3 + s1.y],
+        [s1.x4 + s1.x, s1.y4 + s1.y]]
+    puts a
+  end
+
+end
+
+show