- Qt 5.3
- Qt Quick
- Qt Quick Examples - Canvas
- smile.qml Example File
- Qt 5.3.2 Reference Documentation

# smile.qml Example File

canvas/smile/smile.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** 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:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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: "Smile with arcs"
                anchors.horizontalCenter: parent.horizontalCenter
                color: "#777"
            }

            Canvas {
                id: canvas
                width: 320
                height: parent.height - controls.height
                antialiasing: true

                property color strokeStyle:  Qt.darker(fillStyle, 1.6)
                property color fillStyle: "#e0c31e" // yellow
                property int lineWidth: lineWidthCtrl.value
                property bool fill: true
                property bool stroke: true
                property real scale : scaleCtrl.value
                property real rotate : rotateCtrl.value

                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 + 50  * Math.cos(0),
                               75 - 50  * Math.sin(Math.PI*2));
                    ctx.arc(75,75,50,0,Math.PI*2,true); // Outer circle
                    ctx.moveTo(75,70);
                    ctx.arc(75,70,35,0,Math.PI,false);   // Mouth (clockwise)
                    ctx.moveTo(60,65);
                    ctx.arc(60,65,5,0,Math.PI*2,true);  // Left eye
                    ctx.moveTo(90 + 5  * Math.cos(0),
                               65 - 5  * Math.sin(Math.PI*2));
                    ctx.moveTo(90,65);
                    ctx.arc(90,65,5,0,Math.PI*2,true);  // Right eye
                    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"}
        }
    }