Qt Quick Examples - Canvas

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.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, see Qt Creator: Tutorial: Build and run.

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()
    }
}

Example project @ code.qt.io

© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.