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def tick args
# variables you can play around with
args.state.world.w ||= 1280
args.state.world.h ||= 720
args.state.player.x ||= 0
args.state.player.y ||= 0
args.state.player.size ||= 32
args.state.enemy.x ||= 700
args.state.enemy.y ||= 700
args.state.enemy.size ||= 16
args.state.camera.x ||= 640
args.state.camera.y ||= 300
args.state.camera.scale ||= 1.0
args.state.camera.show_empty_space ||= :yes
# instructions
args.outputs.primitives << { x: 0, y: 80.from_top, w: 360, h: 80, r: 0, g: 0, b: 0, a: 128 }.solid!
args.outputs.primitives << { x: 10, y: 10.from_top, text: "arrow keys to move around", r: 255, g: 255, b: 255}.label!
args.outputs.primitives << { x: 10, y: 30.from_top, text: "+/- to change zoom of camera", r: 255, g: 255, b: 255}.label!
args.outputs.primitives << { x: 10, y: 50.from_top, text: "tab to change camera edge behavior", r: 255, g: 255, b: 255}.label!
# render scene
args.outputs[:scene].w = args.state.world.w
args.outputs[:scene].h = args.state.world.h
args.outputs[:scene].solids << { x: 0, y: 0, w: args.state.world.w, h: args.state.world.h, r: 20, g: 60, b: 80 }
args.outputs[:scene].solids << { x: args.state.player.x, y: args.state.player.y,
w: args.state.player.size, h: args.state.player.size, r: 80, g: 155, b: 80 }
args.outputs[:scene].solids << { x: args.state.enemy.x, y: args.state.enemy.y,
w: args.state.enemy.size, h: args.state.enemy.size, r: 155, g: 80, b: 80 }
# render camera
scene_position = calc_scene_position args
args.outputs.sprites << { x: scene_position.x,
y: scene_position.y,
w: scene_position.w,
h: scene_position.h,
path: :scene }
# move player
if args.inputs.directional_angle
args.state.player.x += args.inputs.directional_angle.vector_x * 5
args.state.player.y += args.inputs.directional_angle.vector_y * 5
args.state.player.x = args.state.player.x.clamp(0, args.state.world.w - args.state.player.size)
args.state.player.y = args.state.player.y.clamp(0, args.state.world.h - args.state.player.size)
end
# +/- to zoom in and out
if args.inputs.keyboard.plus && args.state.tick_count.zmod?(3)
args.state.camera.scale += 0.05
elsif args.inputs.keyboard.hyphen && args.state.tick_count.zmod?(3)
args.state.camera.scale -= 0.05
elsif args.inputs.keyboard.key_down.tab
if args.state.camera.show_empty_space == :yes
args.state.camera.show_empty_space = :no
else
args.state.camera.show_empty_space = :yes
end
end
args.state.camera.scale = args.state.camera.scale.greater(0.1)
end
def calc_scene_position args
result = { x: args.state.camera.x - (args.state.player.x * args.state.camera.scale),
y: args.state.camera.y - (args.state.player.y * args.state.camera.scale),
w: args.state.world.w * args.state.camera.scale,
h: args.state.world.h * args.state.camera.scale,
scale: args.state.camera.scale }
return result if args.state.camera.show_empty_space == :yes
if result.w < args.grid.w
result.merge!(x: (args.grid.w - result.w).half)
elsif (args.state.player.x * result.scale) < args.grid.w.half
result.merge!(x: 10)
elsif (result.x + result.w) < args.grid.w
result.merge!(x: - result.w + (args.grid.w - 10))
end
if result.h < args.grid.h
result.merge!(y: (args.grid.h - result.h).half)
elsif (result.y) > 10
result.merge!(y: 10)
elsif (result.y + result.h) < args.grid.h
result.merge!(y: - result.h + (args.grid.h - 10))
end
result
end
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