qt-everywhere-src-5.15.1/qtbase/examples/opengl/legacy/grabber/glwidget.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 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."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "glwidget.h"

 #include <QMouseEvent>
 #include <QTimer>
 #include <qmath.h>

 GLWidget::GLWidget(QWidget *parent)
     : QGLWidget(parent)
 {
     gear1 = 0;
     gear2 = 0;
     gear3 = 0;
     xRot = 0;
     yRot = 0;
     zRot = 0;
     gear1Rot = 0;

     QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(advanceGears()));
     timer->start(20);
 }

 GLWidget::~GLWidget()
 {
     makeCurrent();
     glDeleteLists(gear1, 1);
     glDeleteLists(gear2, 1);
     glDeleteLists(gear3, 1);
 }

 void GLWidget::setXRotation(int angle)
 {
     normalizeAngle(&angle);
     if (angle != xRot) {
         xRot = angle;
         emit xRotationChanged(angle);
         updateGL();
     }
 }

 void GLWidget::setYRotation(int angle)
 {
     normalizeAngle(&angle);
     if (angle != yRot) {
         yRot = angle;
         emit yRotationChanged(angle);
         updateGL();
     }
 }

 void GLWidget::setZRotation(int angle)
 {
     normalizeAngle(&angle);
     if (angle != zRot) {
         zRot = angle;
         emit zRotationChanged(angle);
         updateGL();
     }
 }

 void GLWidget::initializeGL()
 {
     static const GLfloat lightPos[4] = { 5.0f, 5.0f, 10.0f, 1.0f };
     static const GLfloat reflectance1[4] = { 0.8f, 0.1f, 0.0f, 1.0f };
     static const GLfloat reflectance2[4] = { 0.0f, 0.8f, 0.2f, 1.0f };
     static const GLfloat reflectance3[4] = { 0.2f, 0.2f, 1.0f, 1.0f };

     glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
     glEnable(GL_LIGHTING);
     glEnable(GL_LIGHT0);
     glEnable(GL_DEPTH_TEST);

     gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20);
     gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10);
     gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10);

     glEnable(GL_NORMALIZE);
     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 }

 void GLWidget::paintGL()
 {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glPushMatrix();
     glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
     glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
     glRotated(zRot / 16.0, 0.0, 0.0, 1.0);

     drawGear(gear1, -3.0, -2.0, 0.0, gear1Rot / 16.0);
     drawGear(gear2, +3.1, -2.0, 0.0, -2.0 * (gear1Rot / 16.0) - 9.0);

     glRotated(+90.0, 1.0, 0.0, 0.0);
     drawGear(gear3, -3.1, -1.8, -2.2, +2.0 * (gear1Rot / 16.0) - 2.0);

     glPopMatrix();
 }

 void GLWidget::resizeGL(int width, int height)
 {
     int side = qMin(width, height);
     glViewport((width - side) / 2, (height - side) / 2, side, side);

     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0);
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
     glTranslated(0.0, 0.0, -40.0);
 }

 void GLWidget::mousePressEvent(QMouseEvent *event)
 {
     lastPos = event->pos();
 }

 void GLWidget::mouseMoveEvent(QMouseEvent *event)
 {
     int dx = event->x() - lastPos.x();
     int dy = event->y() - lastPos.y();

     if (event->buttons() & Qt::LeftButton) {
         setXRotation(xRot + 8 * dy);
         setYRotation(yRot + 8 * dx);
     } else if (event->buttons() & Qt::RightButton) {
         setXRotation(xRot + 8 * dy);
         setZRotation(zRot + 8 * dx);
     }
     lastPos = event->pos();
 }

 void GLWidget::advanceGears()
 {
     gear1Rot += 2 * 16;
     updateGL();
 }

 GLuint GLWidget::makeGear(const GLfloat *reflectance, GLdouble innerRadius,
                           GLdouble outerRadius, GLdouble thickness,
                           GLdouble toothSize, GLint toothCount)
 {
     GLuint list = glGenLists(1);
     glNewList(list, GL_COMPILE);
     glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance);

     GLdouble r0 = innerRadius;
     GLdouble r1 = outerRadius - toothSize / 2.0;
     GLdouble r2 = outerRadius + toothSize / 2.0;
     GLdouble toothAngle = 2 * M_PI / toothCount;
     GLdouble delta = toothAngle / 4.0;
     GLdouble z = thickness / 2.0;

     glShadeModel(GL_FLAT);

     for (int i = 0; i < 2; ++i) {
         GLdouble sign = (i == 0) ? +1.0 : -1.0;

         glNormal3d(0.0, 0.0, sign);

         glBegin(GL_QUAD_STRIP);
         for (int j = 0; j <= toothCount; ++j) {
             GLdouble angle = j * toothAngle;
             glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
             glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
             glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
             glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
         }
         glEnd();

         glBegin(GL_QUADS);
         for (int j = 0; j < toothCount; ++j) {
             GLdouble angle = j * toothAngle;
             glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
             glVertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta), sign * z);
             glVertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta), sign * z);
             glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
         }
         glEnd();
     }

     glBegin(GL_QUAD_STRIP);
     for (int i = 0; i < toothCount; ++i) {
         for (int j = 0; j < 2; ++j) {
             GLdouble angle = (i + j / 2.0) * toothAngle;
             GLdouble s1 = r1;
             GLdouble s2 = r2;
             if (j == 1)
                 qSwap(s1, s2);

             glNormal3d(cos(angle), sin(angle), 0.0);
             glVertex3d(s1 * cos(angle), s1 * sin(angle), +z);
             glVertex3d(s1 * cos(angle), s1 * sin(angle), -z);

             glNormal3d(s2 * sin(angle + delta) - s1 * sin(angle),
                        s1 * cos(angle) - s2 * cos(angle + delta), 0.0);
             glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z);
             glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z);
         }
     }
     glVertex3d(r1, 0.0, +z);
     glVertex3d(r1, 0.0, -z);
     glEnd();

     glShadeModel(GL_SMOOTH);

     glBegin(GL_QUAD_STRIP);
     for (int i = 0; i <= toothCount; ++i) {
         GLdouble angle = i * toothAngle;
         glNormal3d(-cos(angle), -sin(angle), 0.0);
         glVertex3d(r0 * cos(angle), r0 * sin(angle), +z);
         glVertex3d(r0 * cos(angle), r0 * sin(angle), -z);
     }
     glEnd();

     glEndList();

     return list;
 }

 void GLWidget::drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
                         GLdouble angle)
 {
     glPushMatrix();
     glTranslated(dx, dy, dz);
     glRotated(angle, 0.0, 0.0, 1.0);
     glCallList(gear);
     glPopMatrix();
 }

 void GLWidget::normalizeAngle(int *angle)
 {
     while (*angle < 0)
         *angle += 360 * 16;
     while (*angle > 360 * 16)
         *angle -= 360 * 16;
 }
	/****************************************************************************
	**
	** Copyright (C) 2016 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."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "glwidget.h"

	#include <QMouseEvent>
	#include <QTimer>
	#include <qmath.h>

	GLWidget::GLWidget(QWidget *parent)
	: QGLWidget(parent)
	{
	gear1 = 0;
	gear2 = 0;
	gear3 = 0;
	xRot = 0;
	yRot = 0;
	zRot = 0;
	gear1Rot = 0;

	QTimer *timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(advanceGears()));
	timer->start(20);
	}

	GLWidget::~GLWidget()
	{
	makeCurrent();
	glDeleteLists(gear1, 1);
	glDeleteLists(gear2, 1);
	glDeleteLists(gear3, 1);
	}

	void GLWidget::setXRotation(int angle)
	{
	normalizeAngle(&angle);
	if (angle != xRot) {
	xRot = angle;
	emit xRotationChanged(angle);
	updateGL();
	}
	}

	void GLWidget::setYRotation(int angle)
	{
	normalizeAngle(&angle);
	if (angle != yRot) {
	yRot = angle;
	emit yRotationChanged(angle);
	updateGL();
	}
	}

	void GLWidget::setZRotation(int angle)
	{
	normalizeAngle(&angle);
	if (angle != zRot) {
	zRot = angle;
	emit zRotationChanged(angle);
	updateGL();
	}
	}

	void GLWidget::initializeGL()
	{
	static const GLfloat lightPos[4] = { 5.0f, 5.0f, 10.0f, 1.0f };
	static const GLfloat reflectance1[4] = { 0.8f, 0.1f, 0.0f, 1.0f };
	static const GLfloat reflectance2[4] = { 0.0f, 0.8f, 0.2f, 1.0f };
	static const GLfloat reflectance3[4] = { 0.2f, 0.2f, 1.0f, 1.0f };

	glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glEnable(GL_DEPTH_TEST);

	gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20);
	gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10);
	gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10);

	glEnable(GL_NORMALIZE);
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	}

	void GLWidget::paintGL()
	{
	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);

	glPushMatrix();
	glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
	glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
	glRotated(zRot / 16.0, 0.0, 0.0, 1.0);

	drawGear(gear1, -3.0, -2.0, 0.0, gear1Rot / 16.0);
	drawGear(gear2, +3.1, -2.0, 0.0, -2.0 * (gear1Rot / 16.0) - 9.0);

	glRotated(+90.0, 1.0, 0.0, 0.0);
	drawGear(gear3, -3.1, -1.8, -2.2, +2.0 * (gear1Rot / 16.0) - 2.0);

	glPopMatrix();
	}

	void GLWidget::resizeGL(int width, int height)
	{
	int side = qMin(width, height);
	glViewport((width - side) / 2, (height - side) / 2, side, side);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glTranslated(0.0, 0.0, -40.0);
	}

	void GLWidget::mousePressEvent(QMouseEvent *event)
	{
	lastPos = event->pos();
	}

	void GLWidget::mouseMoveEvent(QMouseEvent *event)
	{
	int dx = event->x() - lastPos.x();
	int dy = event->y() - lastPos.y();

	if (event->buttons() & Qt::LeftButton) {
	setXRotation(xRot + 8 * dy);
	setYRotation(yRot + 8 * dx);
	} else if (event->buttons() & Qt::RightButton) {
	setXRotation(xRot + 8 * dy);
	setZRotation(zRot + 8 * dx);
	}
	lastPos = event->pos();
	}

	void GLWidget::advanceGears()
	{
	gear1Rot += 2 * 16;
	updateGL();
	}

	GLuint GLWidget::makeGear(const GLfloat *reflectance, GLdouble innerRadius,
	GLdouble outerRadius, GLdouble thickness,
	GLdouble toothSize, GLint toothCount)
	{
	GLuint list = glGenLists(1);
	glNewList(list, GL_COMPILE);
	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance);

	GLdouble r0 = innerRadius;
	GLdouble r1 = outerRadius - toothSize / 2.0;
	GLdouble r2 = outerRadius + toothSize / 2.0;
	GLdouble toothAngle = 2 * M_PI / toothCount;
	GLdouble delta = toothAngle / 4.0;
	GLdouble z = thickness / 2.0;

	glShadeModel(GL_FLAT);

	for (int i = 0; i < 2; ++i) {
	GLdouble sign = (i == 0) ? +1.0 : -1.0;

	glNormal3d(0.0, 0.0, sign);

	glBegin(GL_QUAD_STRIP);
	for (int j = 0; j <= toothCount; ++j) {
	GLdouble angle = j * toothAngle;
	glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
	glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
	glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
	glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
	}
	glEnd();

	glBegin(GL_QUADS);
	for (int j = 0; j < toothCount; ++j) {
	GLdouble angle = j * toothAngle;
	glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
	glVertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta), sign * z);
	glVertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta), sign * z);
	glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
	}
	glEnd();
	}

	glBegin(GL_QUAD_STRIP);
	for (int i = 0; i < toothCount; ++i) {
	for (int j = 0; j < 2; ++j) {
	GLdouble angle = (i + j / 2.0) * toothAngle;
	GLdouble s1 = r1;
	GLdouble s2 = r2;
	if (j == 1)
	qSwap(s1, s2);

	glNormal3d(cos(angle), sin(angle), 0.0);
	glVertex3d(s1 * cos(angle), s1 * sin(angle), +z);
	glVertex3d(s1 * cos(angle), s1 * sin(angle), -z);

	glNormal3d(s2 * sin(angle + delta) - s1 * sin(angle),
	s1 * cos(angle) - s2 * cos(angle + delta), 0.0);
	glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z);
	glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z);
	}
	}
	glVertex3d(r1, 0.0, +z);
	glVertex3d(r1, 0.0, -z);
	glEnd();

	glShadeModel(GL_SMOOTH);

	glBegin(GL_QUAD_STRIP);
	for (int i = 0; i <= toothCount; ++i) {
	GLdouble angle = i * toothAngle;
	glNormal3d(-cos(angle), -sin(angle), 0.0);
	glVertex3d(r0 * cos(angle), r0 * sin(angle), +z);
	glVertex3d(r0 * cos(angle), r0 * sin(angle), -z);
	}
	glEnd();

	glEndList();

	return list;
	}

	void GLWidget::drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
	GLdouble angle)
	{
	glPushMatrix();
	glTranslated(dx, dy, dz);
	glRotated(angle, 0.0, 0.0, 1.0);
	glCallList(gear);
	glPopMatrix();
	}

	void GLWidget::normalizeAngle(int *angle)
	{
	while (*angle < 0)
	angle += 360 16;
	while (angle > 360 16)
	angle -= 360 16;
	}