qt QOpenGLWidget QGLWidget 描画线段

/**************************************************************************** ** ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the QtCore module 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, ** 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 "mainwidget.h" #include <QMouseEvent> #include <math.h> MainWidget::MainWidget(QWidget *parent) #ifdef GEELY_CMA_PROJECT_PC :QGLWidget(parent), #else :QOpenGLWidget(parent), #endif line1(0), line2(0), line3(0), line4(0), texture(0), angularSpeed(0) { } MainWidget::~MainWidget() { // Make sure the context is current when deleting the texture // and the buffers. makeCurrent(); delete texture; delete line1; delete line2; delete line3; delete line4; doneCurrent(); } //! [0] void MainWidget::mousePressEvent(QMouseEvent *e) { // Save mouse press position mousePressPosition = QVector2D(e->localPos()); } void MainWidget::mouseReleaseEvent(QMouseEvent *e) { // Mouse release position - mouse press position QVector2D diff = QVector2D(e->localPos()) - mousePressPosition; // Rotation axis is perpendicular to the mouse position difference // vector QVector3D n = QVector3D(diff.y(), diff.x(), 0.0).normalized(); // Accelerate angular speed relative to the length of the mouse sweep qreal acc = diff.length() / 100.0; // Calculate new rotation axis as weighted sum rotationAxis = (rotationAxis * angularSpeed + n * acc).normalized(); // Increase angular speed angularSpeed += acc; } //! [0] //! [1] void MainWidget::timerEvent(QTimerEvent *) { // Decrease angular speed (friction) // angularSpeed *= 0.99; angularSpeed *= 0.95; // Stop rotation when speed goes below threshold if (angularSpeed < 0.01) { angularSpeed = 0.0; } else { // Update rotation rotation = QQuaternion::fromAxisAndAngle(rotationAxis, angularSpeed) * rotation; // Request an update update(); } } //! [1] void MainWidget::initializeGL() { initializeOpenGLFunctions(); // setGeometry(0,0,1092,656); // resize(1092,656); glClearColor(214.0f/255, 217.0f/255, 224.0f/255, 1); initShaders(); initTextures(); //! [2] // Enable depth buffer //glEnable(GL_DEPTH_TEST); // Enable back face culling glEnable(GL_CULL_FACE); //! [2] line1 = new GeometryLine; line1->initLine(QVector2D(100,700),QVector2D(1092,900),6.0f,QVector4D(1.0f,0,0,1.0)); line2 = new GeometryLine; line2->initLine(QVector2D(100,700),QVector2D(1092,900),4.0f,QVector4D(1.0,1.0f,1.0,1.0)); line3 = new GeometryLine; line3->initLine(QVector2D(100,500),QVector2D(1092,700),6.0f,QVector4D(1.0f,0,0,1.0)); line4 = new GeometryLine; line4->initLine(QVector2D(100,500),QVector2D(1092,700),4.0f,QVector4D(1.0,1.0f,1.0,1.0)); line5 = new GeometryLine; line5->initLine(QVector2D(100,300),QVector2D(1092,500),6.0f,QVector4D(1.0f,0,0,1.0)); line6 = new GeometryLine; line6->initLine(QVector2D(100,300),QVector2D(1092,500),4.0f,QVector4D(1.0,1.0,1.0,1.0)); // Use QBasicTimer because its faster than QTimer timer.start(12, this); } //! [3] void MainWidget::initShaders() { // Compile vertex shader if (!program.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/vshader.glsl")) close(); // Compile fragment shader if (!program.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/fshader.glsl")) close(); // Link shader pipeline if (!program.link()) close(); // Bind shader pipeline for use if (!program.bind()) close(); } //! [3] //! [4] void MainWidget::initTextures() { // Load cube.png image texture = new QOpenGLTexture(QImage(":/cube.png").mirrored()); // Set nearest filtering mode for texture minification texture->setMinificationFilter(QOpenGLTexture::Nearest); // Set bilinear filtering mode for texture magnification texture->setMagnificationFilter(QOpenGLTexture::Linear); // Wrap texture coordinates by repeating // f.ex. texture coordinate (1.1, 1.2) is same as (0.1, 0.2) texture->setWrapMode(QOpenGLTexture::Repeat); } //! [4] //! [5] void MainWidget::resizeGL(int w, int h) { glViewport(0,0,(GLsizei)w,(GLsizei)h); #ifdef GEELY_CMA_PROJECT_PC //投影变换 glMatrixMode(GL_PROJECTION); #endif // Calculate aspect ratio qreal aspect = qreal(w) / qreal(h ? h : 1); // Reset projection projection.setToIdentity(); // Set perspective projection projection.perspective(50, aspect, 0.1, 10000); view.setToIdentity(); float midx = w/2; float midy = h/2; QVector3D eye = QVector3D(midx,midy - 300, 100); QVector3D center = QVector3D(midx,midy,0); QVector3D up = QVector3D(0,0,1); view.lookAt(eye,center,up); } //! [5] void MainWidget::paintGL() { // Clear color and depth buffer glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // glClearColor(1.0, 1.0, 1.0, 1.0); glDisable(GL_DEPTH); texture->bind(); //! [6] // Calculate model view transformation QMatrix4x4 matrix; matrix.translate(0.0, 0.0, -5.0); matrix.rotate(rotation); // Set modelview-projection matrix program.setUniformValue("mvp_matrix", projection * view); //! [6] // Use texture unit 0 which contains cube.png program.setUniformValue("texture", 0); // Draw line geometry line1->drawCubeGeometry(&program); line2->drawCubeGeometry(&program); line3->drawCubeGeometry(&program); line4->drawCubeGeometry(&program); line5->drawCubeGeometry(&program); line6->drawCubeGeometry(&program); }