61 lines
1.6 KiB
Plaintext
61 lines
1.6 KiB
Plaintext
import "graphics" for Canvas, Color, ImageData
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import "dome" for Window
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class MidpointCircle {
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construct new(width, height) {
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Window.title = "Midpoint Circle"
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Window.resize(width, height)
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Canvas.resize(width, height)
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_w = width
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_h = height
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_bmp = ImageData.create("midpoint circle", width, height)
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}
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init() {
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fill(Color.pink)
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drawCircle(200, 200, 100, Color.black)
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drawCircle(200, 200, 50, Color.white)
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_bmp.draw(0, 0)
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}
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fill(col) {
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for (x in 0..._w) {
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for (y in 0..._h) pset(x, y, col)
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}
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}
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drawCircle(centerX, centerY, radius, circleColor) {
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var d = ((5 - radius * 4)/4).truncate
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var x = 0
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var y = radius
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while (true) {
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pset(centerX + x, centerY + y, circleColor)
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pset(centerX + x, centerY - y, circleColor)
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pset(centerX - x, centerY + y, circleColor)
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pset(centerX - x, centerY - y, circleColor)
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pset(centerX + y, centerY + x, circleColor)
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pset(centerX + y, centerY - x, circleColor)
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pset(centerX - y, centerY + x, circleColor)
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pset(centerX - y, centerY - x, circleColor)
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if (d < 0) {
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d = d + 2 * x + 1
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} else {
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d = d + 2 * (x - y) + 1
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y = y - 1
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}
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x = x + 1
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if (x > y) break
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}
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}
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pset(x, y, col) { _bmp.pset(x, y, col) }
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pget(x, y) { _bmp.pget(x, y) }
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update() {}
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draw(alpha) {}
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}
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var Game = MidpointCircle.new(400, 400)
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