pacman-cx/ghost-graphic.cx at master · corpusc/pacman-cx · GitHub

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package graphical2d

func drawGhost (position Position2D, radius f32, color Color, frame f32) {
  var full_angle f32
  full_angle = f32.mul(2.0, 3.141592654)

  var x f32
  var y f32

  gl.Begin(gl.POLYGON)

  gl.Color3f(color.red, color.green, color.blue)

  // head
  var i f32
  for i = 0.0; f32.lteq(i, 10.0); i = f32.add(i, 1.0) {
    x = f32.add(position.x, f32.mul(radius, f32.cos(f32.div(f32.mul(i, full_angle), 20.0))))
    y = f32.add(position.y, f32.mul(radius, f32.sin(f32.div(f32.mul(i, full_angle), 20.0))))

    gl.Vertex2f(x, y)
  }

  // body
  if f32.lteq(frame, 1.0) {
  	drawBody1(x, y, radius)
  } else {
  	drawBody2(x, y, radius)
  }

  gl.End()

  drawEyes(position, radius)
}

func drawBody1 (x f32, y f32, radius f32) {
    for i := 0.0; f32.lt(i, 4.0); i = f32.add(i, 2.0) {
      gl.Vertex2f(f32.add(x, f32.mul(i, f32.div(radius, 2.0))), f32.sub(y, radius))
      gl.Vertex2f(f32.add(x, f32.mul(f32.add(i, 1.0), f32.div(radius, 2.0))), f32.sub(y, f32.div(radius, 2.0)))
    }

    gl.Vertex2f(f32.add(x, f32.mul(4.0, f32.div(radius, 2.0))), f32.sub(y, radius))
}

func drawBody2 (x f32, y f32, radius f32) {
	gl.Vertex2f(f32.add(x, f32.mul(0.0, f32.div(radius, 2.0))), f32.sub(y, f32.div(radius, 2.0)))

	for i := 1.0; f32.lteq(i, 4.0); i = f32.add(i, 2.0) {
	  gl.Vertex2f(f32.add(x, f32.mul(i, f32.div(radius, 2.0))), f32.sub(y, radius))
	  gl.Vertex2f(f32.add(x, f32.mul(f32.add(i, 1.0), f32.div(radius, 2.0))), f32.sub(y, f32.div(radius, 2.0)))
	}
}

func drawEyes (position Position2D, radius f32) {
  // left
  drawCircle(newPosition2D(f32.sub(position.x, f32.div(radius, 2.0)), f32.add(position.y, f32.div(radius, 2.0))), 0.0075, newColor(1.0, 1.0, 1.0))
  drawCircle(newPosition2D(f32.sub(position.x, f32.div(radius, 2.0)), f32.add(position.y, f32.div(radius, 2.0))), 0.005, newColor(0.0, 0.0, 0.0))

  // right
  drawCircle(newPosition2D(f32.add(position.x, f32.div(radius, 2.0)), f32.add(position.y, f32.div(radius, 2.0))), 0.0075, newColor(1.0, 1.0, 1.0))
  drawCircle(newPosition2D(f32.add(position.x, f32.div(radius, 2.0)), f32.add(position.y, f32.div(radius, 2.0))), 0.005, newColor(0.0, 0.0, 0.0))
}