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fix various canvas range/index errors

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root 2009-05-07 18:20:06 +02:00
parent bad1b62696
commit 22e084a600
1 changed files with 20 additions and 2 deletions
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22
actions/pointillize.js
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@ -20,6 +20,8 @@ Pixastic.Actions.pointillize = {
var y = h;
var ctx = params.canvas.getContext("2d");
var canvasWidth = params.canvas.width;
var canvasHeight = params.canvas.height;
var pixel = document.createElement("canvas");
pixel.width = pixel.height = 1;
@ -50,11 +52,27 @@ Pixastic.Actions.pointillize = {
if (pixX < 0) pixX = 0;
if (pixY < 0) pixY = 0;
pixelCtx.drawImage(copy, pixX, pixY, diameter, diameter, 0, 0, 1, 1);
var cx = rndX + rect.left;
var cy = rndY + rect.top;
if (cx < 0) cx = 0;
if (cx > canvasWidth) cx = canvasWidth;
if (cy < 0) cy = 0;
if (cy > canvasHeight) cy = canvasHeight;
var diameterX = diameter;
var diameterY = diameter;
if (diameterX + pixX > w)
diameterX = w - pixX;
if (diameterY + pixY > h)
diameterY = h - pixY;
pixelCtx.drawImage(copy, pixX, pixY, diameterX, diameterY, 0, 0, 1, 1);
var data = pixelCtx.getImageData(0,0,1,1).data;
ctx.fillStyle = "rgb(" + data[0] + "," + data[1] + "," + data[2] + ")";
ctx.beginPath();
ctx.arc(rect.left + rndX,rect.top + rndY, radius, 0, Math.PI*2, true);
ctx.arc(cx, cy, radius, 0, Math.PI*2, true);
ctx.closePath();
ctx.fill();
}