58 lines
1.6 KiB
Plaintext
58 lines
1.6 KiB
Plaintext
import "graphics" for Canvas, ImageData, Color
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import "dome" for Window
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class Game {
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static bmpCreate(name, w, h) { ImageData.create(name, w, h) }
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static bmpFill(name, col) {
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var image = ImageData[name]
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for (x in 0...image.width) {
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for (y in 0...image.height) image.pset(x, y, col)
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}
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}
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static bmpPset(name, x, y, col) { ImageData[name].pset(x, y, col) }
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static bmpPget(name, x, y) { ImageData[name].pget(x, y) }
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static bmpLine(name, x0, y0, x1, y1, col) {
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var dx = (x1 - x0).abs
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var dy = (y1 - y0).abs
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var sx = (x0 < x1) ? 1 : -1
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var sy = (y0 < y1) ? 1 : -1
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var err = ((dx > dy ? dx : - dy) / 2).floor
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while (true) {
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bmpPset(name, x0, y0, col)
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if (x0 == x1 && y0 == y1) break
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var e2 = err
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if (e2 > -dx) {
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err = err - dy
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x0 = x0 + sx
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}
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if (e2 < dy) {
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err = err + dx
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y0 = y0 + sy
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}
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}
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}
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static init() {
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Window.title = "Bresenham's line algorithm"
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var size = 200
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Window.resize(size, size)
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Canvas.resize(size, size)
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var name = "bresenham"
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var bmp = bmpCreate(name, size, size)
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bmpFill(name, Color.white)
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bmpLine(name, 50, 100, 100, 190, Color.black)
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bmpLine(name, 100, 190, 150, 100, Color.black)
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bmpLine(name, 150, 100, 100, 10, Color.black)
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bmpLine(name, 100, 10, 50, 100, Color.black)
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bmp.draw(0, 0)
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}
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static update() {}
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static draw(alpha) {}
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}
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