| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the demonstration applications 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." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "beziercurve.h" |
| |
| #include <QtQuick/qsgnode.h> |
| #include <QtQuick/qsgflatcolormaterial.h> |
| |
| //! [1] |
| BezierCurve::BezierCurve(QQuickItem *parent) |
| : QQuickItem(parent) |
| , m_p1(0, 0) |
| , m_p2(1, 0) |
| , m_p3(0, 1) |
| , m_p4(1, 1) |
| , m_segmentCount(32) |
| { |
| setFlag(ItemHasContents, true); |
| } |
| //! [1] |
| |
| //! [2] |
| BezierCurve::~BezierCurve() |
| { |
| } |
| //! [2] |
| |
| //! [3] |
| void BezierCurve::setP1(const QPointF &p) |
| { |
| if (p == m_p1) |
| return; |
| |
| m_p1 = p; |
| emit p1Changed(p); |
| update(); |
| } |
| //! [3] |
| |
| void BezierCurve::setP2(const QPointF &p) |
| { |
| if (p == m_p2) |
| return; |
| |
| m_p2 = p; |
| emit p2Changed(p); |
| update(); |
| } |
| |
| void BezierCurve::setP3(const QPointF &p) |
| { |
| if (p == m_p3) |
| return; |
| |
| m_p3 = p; |
| emit p3Changed(p); |
| update(); |
| } |
| |
| void BezierCurve::setP4(const QPointF &p) |
| { |
| if (p == m_p4) |
| return; |
| |
| m_p4 = p; |
| emit p4Changed(p); |
| update(); |
| } |
| |
| void BezierCurve::setSegmentCount(int count) |
| { |
| if (m_segmentCount == count) |
| return; |
| |
| m_segmentCount = count; |
| emit segmentCountChanged(count); |
| update(); |
| } |
| |
| //! [4] |
| QSGNode *BezierCurve::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *) |
| { |
| QSGGeometryNode *node = nullptr; |
| QSGGeometry *geometry = nullptr; |
| |
| if (!oldNode) { |
| node = new QSGGeometryNode; |
| //! [4] //! [5] |
| geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), m_segmentCount); |
| geometry->setLineWidth(2); |
| geometry->setDrawingMode(QSGGeometry::DrawLineStrip); |
| node->setGeometry(geometry); |
| node->setFlag(QSGNode::OwnsGeometry); |
| //! [5] //! [6] |
| QSGFlatColorMaterial *material = new QSGFlatColorMaterial; |
| material->setColor(QColor(255, 0, 0)); |
| node->setMaterial(material); |
| node->setFlag(QSGNode::OwnsMaterial); |
| //! [6] //! [7] |
| } else { |
| node = static_cast<QSGGeometryNode *>(oldNode); |
| geometry = node->geometry(); |
| geometry->allocate(m_segmentCount); |
| } |
| //! [7] |
| |
| //! [8] |
| QSizeF itemSize = size(); |
| QSGGeometry::Point2D *vertices = geometry->vertexDataAsPoint2D(); |
| for (int i = 0; i < m_segmentCount; ++i) { |
| qreal t = i / qreal(m_segmentCount - 1); |
| qreal invt = 1 - t; |
| |
| QPointF pos = invt * invt * invt * m_p1 |
| + 3 * invt * invt * t * m_p2 |
| + 3 * invt * t * t * m_p3 |
| + t * t * t * m_p4; |
| |
| float x = pos.x() * itemSize.width(); |
| float y = pos.y() * itemSize.height(); |
| |
| vertices[i].set(x, y); |
| } |
| node->markDirty(QSGNode::DirtyGeometry); |
| //! [8] |
| |
| |
| //! [9] |
| return node; |
| } |
| //! [9] |
| |