HTML5 Rectangle overlapt randen [opgelost]

Hoi,

Ik ben bezig met mijn eerste HTML5 game. Boter kaas en eieren. Nu ben ik zo ver dat als ik een veld aan klik dat het dan geel word. Maar deze werken alleen perfect in de hoeken:
De binnenste vlakken doen vreemd, ze overlappen de randen:

Met alles aangeklikt doet het nog vager?
Ik heb zelf geen idee wat ik fout heb gedaan, misschien weten jullie iets?

Code:

Codeblok (voorbeeld.php):

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(function() {

var canvas = document.getElementById("game")
, ctx = canvas.getContext("2d")
, width = canvas.width
, height = canvas.height
, frame = 0
, lineWidth = 8
, filledRect = []
, widthX = ((width / 3) - (lineWidth / 2))
, heightY = ((height / 3) - (lineWidth / 2))
, startPoints = {
"a1": [0, 0],
"b1": [ (widthX + 8), 0],
"c1": [ ((widthX * 2) + 12), 0],
"a2": [0, (heightY + 8)],
"b2": [(widthX + 8), (heightY + 8)],
"c2": [((widthX * 2) + 12), (heightY + 8)],
"a3": [0,(heightY*2 + 12)],
"b3": [(widthX + 8),(heightY*2 + 12)],
"c3": [((widthX * 2) + 12),(heightY*2 + 12)]
};

var game = {

drawField: function() {

var xAs = 1
, yAs = 1;

while(xAs < 3) {

ctx.beginPath();
ctx.moveTo( ((width / 3) * xAs), 0);
ctx.lineTo( ((width / 3) * xAs), height);
ctx.lineWidth = lineWidth;
ctx.stroke();
xAs++;

}

while(yAs < 3) {

ctx.beginPath();
ctx.moveTo(0, ((height / 3) * yAs));
ctx.lineTo(width, ((height / 3) * yAs));
ctx.lineWidth = lineWidth;
ctx.stroke();
yAs++;

}

},

followFrames: function() {

frame++;
console.info("frame: " + frame);

},

clickedField: function(event) {

var x = event.clientX - canvas.getBoundingClientRect().left
, y = event.clientY - canvas.getBoundingClientRect().top;

if(x >= 0 && x <= widthX) {

if(y >= 0 && y <= heightY) filledRect.push("a1");
if(y >= (heightY + 8) && y <= (heightY * 2)) filledRect.push("a2");
if(y >= ((heightY * 2) + 16) && y <= ((heightY * 3) + 16)) filledRect.push("a3");

}

if(x >= (widthX + 8) && x <= (widthX * 2)) {

if(y >= 0 && y <= heightY) filledRect.push("b1");
if(y >= (heightY + 8) && y <= (heightY * 2)) filledRect.push("b2");
if(y >= ((heightY * 2) + 16) && y <= ((heightY * 3) + 16)) filledRect.push("b3");

}

if(x >= ((widthX * 2) + 16) && x <= (widthX * 3) + 16) {

if(y >= 0 && y <= heightY) filledRect.push("c1");
if(y >= (heightY + 8) && y <= (heightY * 2)) filledRect.push("c2");
if(y >= ((heightY * 2) + 16) && y <= ((heightY * 3) + 16)) filledRect.push("c3");

}

},

fillRect: function() {

var filled = [];

for(var key in filledRect) {
if(filled.indexOf(key) === -1) {
ctx.beginPath();
ctx.rect(startPoints[filledRect[key]][0], startPoints[filledRect[key]][1], widthX, heightY);
ctx.fillStyle = "yellow";
ctx.fill();
filled.push(key);
}
}
}

};

/* Thanks to: http://www.paulirish.com/ */
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();

(function clock() {

requestAnimFrame(clock) ;
render();

})();

function render() {

ctx.clearRect(0,0, width, height);

game.drawField();
//game.followFrames();
game.fillRect();

}

canvas.addEventListener("click", function(event) {

game.clickedField(event);

});

})();

Alvast bedankt!

toevoeging op 22 november 2014, 17:38:29:
Opgelost door eerst de gele velden te renderen en daarna pas de randen!