- Qt 5.5
- Qt Quick
- Qt Quick Examples - Canvas
- roundedrect.qml Example File
- Qt 5.5.1 Reference Documentation

# roundedrect.qml Example File

canvas/roundedrect/roundedrect.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    **     from this software without specific prior written permission.
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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"}
        }
    }