HTML5 Canvas实现绘制一个像素宽的细线

ctx.lineWidth = 1;

ctx.beginPath();

ctx.moveTo(10, 100);

ctx.lineTo(300,100);

ctx.stroke();

/**

* <p> draw one pixel line </p>

* @param fromX

* @param formY

* @param toX

* @param toY

* @param backgroundColor - default is white

* @param vertical - boolean

*/

CanvasRenderingContext2D.prototype.onePixelLineTo = function(fromX, fromY, toX, toY, backgroundColor, vertical) {

var currentStrokeStyle = this.strokeStyle;

this.beginPath();

this.moveTo(fromX, fromY);

this.lineTo(toX, toY);

this.closePath();

this.lineWidth=2;

this.stroke();

this.beginPath();

if(vertical) {

this.moveTo(fromX+1, fromY);

this.lineTo(toX+1, toY);

} else {

this.moveTo(fromX, fromY+1);

this.lineTo(toX, toY+1);

}

this.closePath();

this.lineWidth=2;

this.strokeStyle=backgroundColor;

this.stroke();

this.strokeStyle = currentStrokeStyle;

};

ctx.save();

ctx.translate(0.5,0.5);

ctx.lineWidth = 1;

ctx.beginPath();

ctx.moveTo(10, 100);

ctx.lineTo(300,100);

ctx.stroke();

ctx.restore();