<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>quadraticCurveTo.qml Example File | Qt Quick 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-canvas-example.html">Qt Quick Examples - Canvas</a></td><td >quadraticCurveTo.qml Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">quadraticCurveTo.qml Example File</h1> <span class="subtitle">canvas/quadraticCurveTo/quadraticCurveTo.qml</span> <!-- $$$canvas/quadraticCurveTo/quadraticCurveTo.qml-description --> <div class="descr"> <a name="details"></a> <pre class="qml"> /**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ 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: "Quadratic Curve" anchors.horizontalCenter: parent.horizontalCenter color: "#777" } Canvas { id: canvas width: 320 height: 280 property color strokeStyle: Qt.darker(fillStyle, 1.3) property color fillStyle: "#14aaff" // blue 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 = 75 var originY = 75 ctx.save(); ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.translate(originX, originX); ctx.strokeStyle = canvas.strokeStyle; ctx.fillStyle = canvas.fillStyle; ctx.lineWidth = canvas.lineWidth; ctx.translate(originX, originY) ctx.rotate(canvas.rotate); ctx.scale(canvas.scale, canvas.scale); ctx.translate(-originX, -originY) // ![0] ctx.beginPath(); ctx.moveTo(75,25); ctx.quadraticCurveTo(25,25,25,62.5); ctx.quadraticCurveTo(25,100,50,100); ctx.quadraticCurveTo(50,120,30,125); ctx.quadraticCurveTo(60,120,65,100); ctx.quadraticCurveTo(125,100,125,62.5); ctx.quadraticCurveTo(125,25,75,25); ctx.closePath(); // ![0] if (canvas.fill) ctx.fill(); if (canvas.stroke) ctx.stroke(); // ![1] ctx.fillStyle = "white"; ctx.font = "bold 17px sans-serif"; ctx.fillText("Qt Quick", 40, 70); // ![1] ctx.restore(); } } } Column { 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"} } } </pre> </div> <!-- @@@canvas/quadraticCurveTo/quadraticCurveTo.qml --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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