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 (let 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()
    }
}

范例工程 @ code.qt.io