Qt 5.9 | Qt Quick | Qt Quick Examples - Canvas | tiger.qml Example File

Qt 5.9.9 Reference Documentation

# tiger.qml Example File

canvas/tiger/tiger.qml

      /****************************************************************************
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      import QtQuick 2.0
      import "../contents"
      import "../../shared"
      import "tiger.js" as Tiger

      Item {
          id: container
          width: 320
          height: 480

          Column {
              spacing: 6
              anchors.fill: parent
              anchors.topMargin: 12

              Text {
                  font.pointSize: 24
                  font.bold: true
                  text: "Tiger with SVG path"
                  anchors.horizontalCenter: parent.horizontalCenter
                  color: "#777"
              }

              Canvas {
                  id: canvas
                  width: 320
                  height: 280
                  antialiasing: true

                  property string strokeStyle: "steelblue"
                  property string fillStyle: "yellow"
                  property bool fill: true
                  property bool stroke: true
                  property real alpha: alphaCtrl.value
                  property real scale: scaleCtrl.value
                  property real rotate: rotateCtrl.value
                  property int frame: 0

                  onFillChanged: requestPaint();
                  onStrokeChanged: requestPaint();
                  onAlphaChanged: requestPaint();
                  onScaleChanged: requestPaint();
                  onRotateChanged: requestPaint();

                  onPaint: {
                      var ctx = canvas.getContext('2d');
                      var originX = canvas.width/2 + 30
                      var originY = canvas.height/2 + 60

                      ctx.save();
                      ctx.clearRect(0, 0, canvas.width, canvas.height);
                      ctx.globalAlpha = canvas.alpha;
                      ctx.globalCompositeOperation = "source-over";

                      ctx.translate(originX, originY)
                      ctx.scale(canvas.scale, canvas.scale);
                      ctx.rotate(canvas.rotate);
                      ctx.translate(-originX, -originY)

                      ctx.strokeStyle = Qt.rgba(.3, .3, .3,1);
                      ctx.lineWidth = 1;

                      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();
                          }
                      }
                      ctx.restore();
                  }
              }
          }
          Column {
              id: controls
              anchors.bottom: parent.bottom
              anchors.bottomMargin: 12
              Slider {id: scaleCtrl ; min: 0.1 ; max: 1 ; init: 0.3 ; name: "Scale"}
              Slider {id: rotateCtrl ; min: 0 ; max: Math.PI*2 ; init: 0 ; name: "Rotate"}
              Slider {id: alphaCtrl ; min: 0 ; max: 1 ; init: 1 ; name: "Alpha"}
          }
      }