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/****************************************************************************
**
** Copyright (C) 2023 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
//![0]
import QtQuick
Canvas {
id: canvas
width: 800
height: 600
antialiasing: true
renderTarget: Canvas.FramebufferObject
property var points: []
onPaint: {
if (points.length < 2)
return
var ctx = canvas.getContext('2d');
ctx.save()
ctx.strokeStyle = stylusHandler.active ? "blue" : "white"
ctx.lineCap = "round"
ctx.beginPath()
ctx.moveTo(points[0].x, points[0].y)
for (var i = 1; i < points.length; i++)
ctx.lineTo(points[i].x, points[i].y)
ctx.lineWidth = 3
ctx.stroke()
points = points.slice(points.length - 2, 1)
ctx.restore()
}
PointHandler {
id: stylusHandler
acceptedPointerTypes: PointerDevice.Pen
onPointChanged: {
canvas.points.push(point.position)
canvas.requestPaint()
}
}
PointHandler {
id: eraserHandler
acceptedPointerTypes: PointerDevice.Eraser
onPointChanged: {
canvas.points.push(point.position)
canvas.requestPaint()
}
}
Rectangle {
width: 10; height: 10
color: stylusHandler.active ? "green" : eraserHandler.active ? "red" : "beige"
}
}
//![0]
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