mirror of
https://github.com/lospec/pixel-editor.git
synced 2023-08-10 21:12:51 +03:00
21 lines
535 B
JavaScript
21 lines
535 B
JavaScript
//draw a line between two points on canvas
|
|
function line(x0,y0,x1,y1) {
|
|
|
|
var dx = Math.abs(x1-x0);
|
|
var dy = Math.abs(y1-y0);
|
|
var sx = (x0 < x1 ? 1 : -1);
|
|
var sy = (y0 < y1 ? 1 : -1);
|
|
var err = dx-dy;
|
|
var breaker = 0;
|
|
|
|
while (true) {
|
|
//set pixel
|
|
context.fillRect(x0-Math.floor(brushSize/2), y0-Math.floor(brushSize/2), brushSize, brushSize);
|
|
|
|
//if we've reached the end goal, exit the loop
|
|
if ((x0==x1) && (y0==y1)) break;
|
|
var e2 = 2*err;
|
|
if (e2 >-dy) {err -=dy; x0+=sx;}
|
|
if (e2 < dx) {err +=dx; y0+=sy;}
|
|
}
|
|
} |