function plot(X, Y, cc) {
	cc.fillRect(X,Y,1,1);
}

function plotLineLow(firstX, firstY, secondX, secondY, cc) {
	//Dessine la ligne dans le cas où l'écart entre les abscisses est plus grand que l'écart entre les ordonnées.
	var dx = secondX - firstX;
	var dy = secondY - firstY;
	var yi = 1;
	if (dy < 0) { yi = -1; dy = -dy; }
	if (dx < 0) { dx = -dx; }
	var D = 2*dy - dx;
	/*console.log ("dx = " + dx + " | dy = " + dy + " | D = " + D);*/
	var y = firstY;
	if (firstX > secondX) {
		for (var x = firstX; x >= secondX; x--) {
			plot(x, y, cc);
			if (D > 0) {
				y += yi;
				D -= 2*dx;
			}
			D += 2 * dy;
		}
	} else {
		for (var x = firstX; x <= secondX; x++) {
			plot(x, y, cc);
			if (D > 0) {
				y += yi;
				D -= 2*dx;
			}
			D += 2 * dy;
		}
	}
}

function plotLineHigh(firstX, firstY, secondX, secondY, cc) {
	//Dans le cas où ... ?
	var dx = secondX - firstX;
	var dy = secondY - firstY;
	var xi = 1;
	if (dx < 0) { xi = -1; dx = -dx; }
	if (dy < 0) { dy = -dy;}
	var D = 2*dx - dy;
	/*console.log ("dx = " + dx + " | dy = " + dy + " | D = " + D);*/
	var x = firstX;
	if (firstY > secondY) {
		for (var y = firstY; y >= secondY; y--) {
			plot(x, y, cc);
			if (D > 0) { 
				x += xi;
				D -= 2*dy;
			}
			D += 2*dx;
		}
	} else {
		for (var y = firstY; y <= secondY; y++) {
			plot(x, y, cc);
			if (D > 0) { 
				x += xi;
				D -= 2*dy;
			}
			D += 2*dx;
		}
	}
}

function plotLine(firstX, firstY, secondX, secondY, cc) {
	if (Math.abs(secondY - firstY) < Math.abs(secondX - firstX)) {
		//Si la différence entre les abscisses est plus grandes que la différence entre les ordonnées...
		plotLineLow(firstX, firstY, secondX, secondY, cc);
			
	} else {
		//Autrement, on utilise plotLineHigh.
		plotLineHigh(firstX, firstY, secondX, secondY,cc);
		/*plotLineHigh(secondX, secondY, firstX, firstY, cc);*/
	}
}