Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Tree: f06b0e9d96
Fetching contributors…

Cannot retrieve contributors at this time

78 lines (60 sloc) 1.579 kB
var width = 800;
var height = 600;
function getCanvas() {
return document.getElementById('canvas');
}
window.addEventListener('load', function() {
var canvas = getCanvas();
if(canvas && canvas.getContext) {
var context = canvas.getContext('2d');
if (context) {
context.fillStyle = '#fff';
context.fillRect(0, 0, width, height);
}
}
canvas.addEventListener('mousemove', mouseMove, false);
canvas.addEventListener('mousedown', mouseDown, false);
}, false);
function getEventXCoord(ev){
if(ev.layerX){ //Firefox
return ev.layerX;
}
return ev.offsetX; //Opera
}
function getEventYCoord(ev){
if(ev.layerY){ //Firefox
return ev.layerY;
}
return ev.offsetY; //Opera
}
function mouseDown(ev){
var canvas = getCanvas();
context = canvas.getContext('2d');
debug = 1;
}
function getLine2(){
return new Segment(new Vector(0, 100), new Vector(150, 50));
}
var debug = 1;
function mouseMove(ev) {
var canvas = getCanvas();
context = canvas.getContext('2d');
context.fillStyle = '#fff';
context.fillRect(0, 0, width, height);
context.fillStyle = '#f00'; //red
context.strokeStyle = '#000'; //green
context.lineWidth = 4;
var x = getEventXCoord(ev);
var y = getEventYCoord(ev);
var p1 = new Vector(0, 200);
var p2 = new Vector(150, 150);
var p3 = new Vector(x, y);
var seg1 = new Segment(p2, p3);
var seg2 = new Segment(p1, p2);
if(leftTurn(p1, p2, p3)){
seg1.color = '#f00';
seg2.color = '#f00';
}
seg1.draw(getCanvas());
seg2.draw(getCanvas());
};
Jump to Line
Something went wrong with that request. Please try again.