Qt 5.7 | Qt Quick | Qt Quick Examples - Canvas

Qt 5.7.1 Reference Documentation

# Qt Quick Examples - Canvas

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, visit Building and Running an Example.

## 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();
          }
      }

Files:

- canvas/canvas.qml
- canvas/bezierCurve/bezierCurve.qml
- canvas/clip/clip.qml
- canvas/quadraticCurveTo/quadraticCurveTo.qml
- canvas/roundedrect/roundedrect.qml
- canvas/smile/smile.qml
- canvas/squircle/squircle.qml
- canvas/tiger/tiger.js
- canvas/tiger/tiger.qml
- canvas/main.cpp
- canvas/canvas.pro
- canvas/canvas.qrc