Qt 5.11 | Qt Quick | Qt Quick Examples - Canvas | roundedrect.qml Example File

Qt 5.11.3 Reference Documentation

# roundedrect.qml Example File

canvas/roundedrect/roundedrect.qml

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

      Item {
          id:container
          width: 320
          height: 480

          Column {
              spacing: 6
              anchors.fill: parent
              anchors.topMargin: 12
              Text {
                  font.pointSize: 24
                  font.bold: true
                  text: "Rounded rectangle"
                  anchors.horizontalCenter: parent.horizontalCenter
                  color: "#777"
              }
              Canvas {
                  id: canvas
                  width: 320
                  height: 280
                  antialiasing: true

                  property int radius: rCtrl.value
                  property int rectx: 60
                  property int recty: 60
                  property int rectWidth: width - 2*rectx
                  property int rectHeight: height - 2*recty
                  property color strokeStyle:  Qt.darker(fillStyle, 1.4)
                  property color fillStyle: "#ae32a0" // purple
                  property int lineWidth: lineWidthCtrl.value
                  property bool fill: true
                  property bool stroke: true
                  property real alpha: 1.0

                  onLineWidthChanged:requestPaint();
                  onFillChanged:requestPaint();
                  onStrokeChanged:requestPaint();
                  onRadiusChanged:requestPaint();

                  onPaint: {
                      var ctx = getContext("2d");
                      ctx.save();
                      ctx.clearRect(0,0,canvas.width, canvas.height);
                      ctx.strokeStyle = canvas.strokeStyle;
                      ctx.lineWidth = canvas.lineWidth
                      ctx.fillStyle = canvas.fillStyle
                      ctx.globalAlpha = canvas.alpha
                      ctx.beginPath();
                      ctx.moveTo(rectx+radius,recty);                 // top side
                      ctx.lineTo(rectx+rectWidth-radius,recty);
                      // draw top right corner
                      ctx.arcTo(rectx+rectWidth,recty,rectx+rectWidth,recty+radius,radius);
                      ctx.lineTo(rectx+rectWidth,recty+rectHeight-radius);    // right side
                      // draw bottom right corner
                      ctx.arcTo(rectx+rectWidth,recty+rectHeight,rectx+rectWidth-radius,recty+rectHeight,radius);
                      ctx.lineTo(rectx+radius,recty+rectHeight);              // bottom side
                      // draw bottom left corner
                      ctx.arcTo(rectx,recty+rectHeight,rectx,recty+rectHeight-radius,radius);
                      ctx.lineTo(rectx,recty+radius);                 // left side
                      // draw top left corner
                      ctx.arcTo(rectx,recty,rectx+radius,recty,radius);
                      ctx.closePath();
                      if (canvas.fill)
                          ctx.fill();
                      if (canvas.stroke)
                          ctx.stroke();
                      ctx.restore();
                  }
              }
          }
          Column {
              anchors.bottom: parent.bottom
              anchors.bottomMargin: 12
              Slider {id: lineWidthCtrl ; min: 1 ; max: 10; init: 2 ; name: "Outline"}
              Slider {id: rCtrl ; min: 10 ; max: 80 ; init: 40 ; name: "Radius"}
          }
      }