Qt Quick 范例 - 画布

This is a collection of QML Canvas examples.

Canvas is a collection of small QML examples relating to the Canvas type. Each example is a small QML file emphasizing a particular type or feature.

运行范例

要运行范例从 Qt Creator ，打开欢迎模式，然后选择范例从范例。更多信息，拜访构建和运行范例 .

Red Heart

Red heart uses the bezier curve API to stroke and fill a red heart.

ctx.beginPath();
ctx.moveTo(75,40);
ctx.bezierCurveTo(75,37,70,25,50,25);
ctx.bezierCurveTo(20,25,20,62.5,20,62.5);
ctx.bezierCurveTo(20,80,40,102,75,120);
ctx.bezierCurveTo(110,102,130,80,130,62.5);
ctx.bezierCurveTo(130,62.5,130,25,100,25);
ctx.bezierCurveTo(85,25,75,37,75,40);
ctx.closePath();

Talk Bubble

Talk bubble uses the quadraticCurveTo() API to stroke and fill a customized talk bubble:

ctx.beginPath();
ctx.moveTo(75,25);
ctx.quadraticCurveTo(25,25,25,62.5);
ctx.quadraticCurveTo(25,100,50,100);
ctx.quadraticCurveTo(50,120,30,125);
ctx.quadraticCurveTo(60,120,65,100);
ctx.quadraticCurveTo(125,100,125,62.5);
ctx.quadraticCurveTo(125,25,75,25);
ctx.closePath();

This example also demonstrates the fillText() API:

ctx.fillStyle = "white";
ctx.font = "bold 17px sans-serif";
ctx.fillText("Qt Quick", 40, 70);

Squircle

Squircle uses a collection of simple moveTo() and lineTo() path APIs to draw a smooth squircle.

Rounded Rectangle

Rounded rectangle uses a collection of lineTo() and arcTo() path APIs to draw a rounded rectangle.

Smile Face

Smile face uses several paths to draw and fill a smiling face.

Clip

Clip uses the clip API to clip a given image.

ctx.clip();
ctx.drawImage(canvas.imagefile, 0, 0);

Tiger

Tiger uses the SVG path API to draw a tiger with a collection of SVG path strings.

for (var i = 0; i < Tiger.tiger.length; i++) {
    if (Tiger.tiger[i].width != undefined)
        ctx.lineWidth = Tiger.tiger[i].width;
    if (Tiger.tiger[i].path != undefined)
        ctx.path = Tiger.tiger[i].path;
    if (Tiger.tiger[i].fill != undefined) {
        ctx.fillStyle = Tiger.tiger[i].fill;
        ctx.fill();
    }
    if (Tiger.tiger[i].stroke != undefined) {
        ctx.strokeStyle = Tiger.tiger[i].stroke;
        ctx.stroke();
    }
}

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图像：