bezierCurve.qml Example File

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  import QtQuick 2.0
  import "../contents"
  import "../../shared"

  Item {
      id:container
      width: 320
      height: 480

      Column {
          spacing:5
          anchors.fill: parent
          anchors.topMargin: 12

          Text {
              font.pointSize: 24
              font.bold: true
              text: "Bezier Curve"
              anchors.horizontalCenter: parent.horizontalCenter
              color: "#777"
          }

          Canvas {
              id:canvas
              width:320
              height:280
              property color strokeStyle:  Qt.darker(fillStyle, 1.4)
              property color fillStyle: "#b40000" // red
              property int lineWidth: lineWidthCtrl.value
              property bool fill: true
              property bool stroke: true
              property real alpha: 1.0
              property real scale : scaleCtrl.value
              property real rotate : rotateCtrl.value
              antialiasing: true

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

              onPaint: {
                  var ctx = canvas.getContext('2d');
                  var originX = 85
                  var originY = 75
                  ctx.save();
                  ctx.clearRect(0, 0, canvas.width, canvas.height);
                  ctx.translate(originX, originX);
                  ctx.globalAlpha = canvas.alpha;
                  ctx.strokeStyle = canvas.strokeStyle;
                  ctx.fillStyle = canvas.fillStyle;
                  ctx.lineWidth = canvas.lineWidth;

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

                  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();
                  if (canvas.fill)
                      ctx.fill();
                  if (canvas.stroke)
                      ctx.stroke();
                  ctx.restore();
              }
          }
      }
      Column {
          id: controls
          anchors.bottom: parent.bottom
          anchors.bottomMargin: 12
          Slider {id: lineWidthCtrl; min: 1; max: 10; init: 2; name: "Outline"}
          Slider {id: scaleCtrl; min: 0.1; max: 10; init: 1; name: "Scale"}
          Slider {id: rotateCtrl; min: 0; max: Math.PI*2; init: 0; name: "Rotate"}
      }
  }