Qt：自己修改的VowelCube

#include <QtGui> #include <QtOpenGL> #include <cmath> #ifndef GL_MULTISAMPLE #define GL_MULTISAMPLE 0x809D #endif #include "vowelcube.h" VowelCube::VowelCube(QWidget *parent) : QGLWidget(parent) { // 必须注释掉 //setFormat(QGLFormat(QGL::SampleBuffers)); rotationX = -38.0; rotationY = -58.0; rotationZ = 0.0; scaling = 1.0; // 后面添加的 setAutoBufferSwap( false ); setAutoFillBackground( false ); createGradient(); createGLObject(); } VowelCube::~VowelCube() { makeCurrent(); glDeleteLists(glObject, 1); } void VowelCube::paintEvent(QPaintEvent * /* event */) { /* 这是原有的代码 QPainter painter(this); drawBackground(&painter); drawCube(); drawLegend(&painter); */ // 这是后面添加的代码 QPainter painter(this); drawBackground(&painter); painter.end(); drawCube(); painter.begin(this); drawLegend(&painter); painter.end(); swapBuffers(); } void VowelCube::mousePressEvent(QMouseEvent *event) { lastPos = event->pos(); } void VowelCube::mouseMoveEvent(QMouseEvent *event) { GLfloat dx = GLfloat(event->x() - lastPos.x()) / width(); GLfloat dy = GLfloat(event->y() - lastPos.y()) / height(); if (event->buttons() & Qt::LeftButton) { rotationX += 180 * dy; rotationY += 180 * dx; update(); } else if (event->buttons() & Qt::RightButton) { rotationX += 180 * dy; rotationZ += 180 * dx; update(); } lastPos = event->pos(); } void VowelCube::wheelEvent(QWheelEvent *event) { double numDegrees = -event->delta() / 8.0; double numSteps = numDegrees / 15.0; scaling *= std::pow(1.125, numSteps); update(); } void VowelCube::createGradient() { gradient.setCoordinateMode(QGradient::ObjectBoundingMode); gradient.setCenter(0.45, 0.50); gradient.setFocalPoint(0.40, 0.45); gradient.setColorAt(0.0, QColor(105, 146, 182)); gradient.setColorAt(0.4, QColor(81, 113, 150)); gradient.setColorAt(0.8, QColor(16, 56, 121)); } void VowelCube::createGLObject() { makeCurrent(); glShadeModel(GL_FLAT); glObject = glGenLists(1); glNewList(glObject, GL_COMPILE); qglColor(QColor(255, 239, 191)); glLineWidth(1.0); glBegin(GL_LINES); glVertex3f(+1.0, +1.0, -1.0); glVertex3f(-1.0, +1.0, -1.0); glVertex3f(+1.0, -1.0, -1.0); glVertex3f(-1.0, -1.0, -1.0); glVertex3f(+1.0, -1.0, +1.0); glVertex3f(-1.0, -1.0, +1.0); glEnd(); glBegin(GL_LINE_LOOP); glVertex3f(+1.0, +1.0, +1.0); glVertex3f(+1.0, +1.0, -1.0); glVertex3f(+1.0, -1.0, -1.0); glVertex3f(+1.0, -1.0, +1.0); glVertex3f(+1.0, +1.0, +1.0); glVertex3f(-1.0, +1.0, +1.0); glVertex3f(-1.0, +1.0, -1.0); glVertex3f(-1.0, -1.0, -1.0); glVertex3f(-1.0, -1.0, +1.0); glVertex3f(-1.0, +1.0, +1.0); glEnd(); glEndList(); } void VowelCube::drawBackground(QPainter *painter) { painter->setPen(Qt::NoPen); painter->setBrush(gradient); painter->drawRect(rect()); } void VowelCube::drawCube() { makeCurrent(); glPushAttrib(GL_ALL_ATTRIB_BITS); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); GLfloat x = 3.0 * GLfloat(width()) / height(); glOrtho(-x, +x, -3.0, +3.0, 4.0, 15.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTranslatef(0.0, 0.0, -10.0); glScalef(scaling, scaling, scaling); glRotatef(rotationX, 1.0, 0.0, 0.0); glRotatef(rotationY, 0.0, 1.0, 0.0); glRotatef(rotationZ, 0.0, 0.0, 1.0); glEnable(GL_MULTISAMPLE); glCallList(glObject); setFont(QFont("Times", 24)); qglColor(QColor(255, 223, 127)); renderText(+1.1, +1.1, +1.1, QChar('a')); renderText(-1.1, +1.1, +1.1, QChar('e')); renderText(+1.1, +1.1, -1.1, QChar('o')); renderText(-1.1, +1.1, -1.1, QChar(0x00F6)); renderText(+1.1, -1.1, +1.1, QChar(0x0131)); renderText(-1.1, -1.1, +1.1, QChar('i')); renderText(+1.1, -1.1, -1.1, QChar('u')); renderText(-1.1, -1.1, -1.1, QChar(0x00FC)); glMatrixMode(GL_MODELVIEW); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glPopAttrib(); } void VowelCube::drawLegend(QPainter *painter) { const int Margin = 11; const int Padding = 6; QTextDocument textDocument; textDocument.setDefaultStyleSheet("* { color: #FFEFEF }"); textDocument.setHtml("<h4 align=\"center\">Vowel Categories</h4>" "<p align=\"center\"><table width=\"100%\">" "<tr><td>Open:<td>a<td>e<td>o<td>&ouml;" "<tr><td>Close:<td>&#305;<td>i<td>u<td>&uuml;" "<tr><td>Front:<td>e<td>i<td>&ouml;<td>&uuml;" "<tr><td>Back:<td>a<td>&#305;<td>o<td>u" "<tr><td>Round:<td>o<td>&ouml;<td>u<td>&uuml;" "<tr><td>Unround:<td>a<td>e<td>&#305;<td>i" "</table>"); textDocument.setTextWidth(textDocument.size().width()); QRect rect(QPoint(0, 0), textDocument.size().toSize() + QSize(2 * Padding, 2 * Padding)); painter->translate(width() - rect.width() - Margin, height() - rect.height() - Margin); painter->setPen(QColor(255, 239, 239)); painter->setBrush(QColor(255, 0, 0, 31)); painter->drawRect(rect); painter->translate(Padding, Padding); textDocument.drawContents(painter); }