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author | Haoyi Li <haoyi@haoyi-mbp.corp.dropbox.com> | 2014-11-26 00:44:45 -0800 |
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committer | Haoyi Li <haoyi@haoyi-mbp.corp.dropbox.com> | 2014-11-26 00:44:45 -0800 |
commit | f2f03076c55939e454b8e3ce71408c1fd9cd1994 (patch) | |
tree | ce3b70765a84549c73e198b667548516f4b8b1ec /src/main/scala/example/ScalaJSExample.scala | |
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Squashed 'examples/workbench-example-app/' content from commit ab2adb3
git-subtree-dir: examples/workbench-example-app
git-subtree-split: ab2adb3d7eef35deee9685236f5aac4f06c2241c
Diffstat (limited to 'src/main/scala/example/ScalaJSExample.scala')
-rw-r--r-- | src/main/scala/example/ScalaJSExample.scala | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/main/scala/example/ScalaJSExample.scala b/src/main/scala/example/ScalaJSExample.scala new file mode 100644 index 0000000..e7e5326 --- /dev/null +++ b/src/main/scala/example/ScalaJSExample.scala @@ -0,0 +1,43 @@ +package example +import scala.scalajs.js.annotation.JSExport +import org.scalajs.dom +import scala.util.Random + +case class Point(x: Int, y: Int){ + def +(p: Point) = Point(x + p.x, y + p.y) + def /(d: Int) = Point(x / d, y / d) +} + +@JSExport +object ScalaJSExample { + @JSExport + def main(canvas: dom.HTMLCanvasElement): Unit = { + val ctx = canvas.getContext("2d") + .asInstanceOf[dom.CanvasRenderingContext2D] + + var count = 0 + var p = Point(0, 0) + val corners = Seq(Point(255, 255), Point(0, 255), Point(128, 0)) + + def clear() = { + ctx.fillStyle = "black" + ctx.fillRect(0, 0, 255, 255) + } + + def run = for (i <- 0 until 10){ + if (count % 3000 == 0) clear() + count += 1 + p = (p + corners(Random.nextInt(3))) / 2 + + val height = 512.0 / (255 + p.y) + val r = (p.x * height).toInt + val g = ((255-p.x) * height).toInt + val b = p.y + ctx.fillStyle = s"rgb($g, $r, $b)" + + ctx.fillRect(p.x, p.y, 1, 1) + } + + dom.setInterval(() => run, 50) + } +} |