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#include <QtOpenGL>
#include <math.h>
#include "GLWidget.h"
#include "util.h"
void torus(int numc, int numt, double fraction = 1 , double R = 1, double r = 0.1) {
int i, j, k;
double s, t, x, y, z, twopi;
twopi = 2 * M_PI;
for (i = 0; i < numc; i++) {
glBegin(GL_QUAD_STRIP);
for (j = 0; j <= numt / fraction ; j++) {
for (k = 1; k >= 0; k--) {
s = (i + k) % numc + 0.5;
t = j % numt;
x = (R+r*cos(s*twopi/numc))*cos(t*twopi/numt);
y = (R+r*cos(s*twopi/numc))*sin(t*twopi/numt);
z = r * sin(s * twopi / numc);
glColor3d(0, s/numc, t/numc);
glVertex3f(x, y, z);
}
}
glEnd();
}
}
void axes() {
glBegin(GL_LINES);
glColor3d(1, 0, 0);
glVertex3d(0, 0, 0); // origin of the line
glVertex3d(100, 0, 0); // ending point of the line
glEnd();
glBegin(GL_LINES);
glColor3d(0, 1, 0);
glVertex3d(0, 0, 0); // origin of the line
glVertex3d(0, 100, 0); // ending point of the line
glEnd();
glBegin(GL_LINES);
glColor3d(0, 0, 1);
glVertex3d(0, 0, 0); // origin of the line
glVertex3d(0, 0, 100); // ending point of the line
glEnd();
}
GLWidget::GLWidget (QWidget* parent)
: QGLWidget (parent)
{
eyeX = 0;
eyeY = 0;
eyeZ = 10;
resize (sizeHint ());
}
GLWidget::~GLWidget () {}
QSize GLWidget::minimumSizeHint () const {
return QSize (50, 50);
}
QSize GLWidget::sizeHint () const {
return QSize (800, 600);
}
void GLWidget::initializeGL () {
glClearColor (0, 0, 0, 1.0);
glEnable (GL_DEPTH_TEST);
gluPerspective(65.0, 4.0/3, 1.0, 1000.0);
}
void GLWidget::paintGL () {
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity ();
gluLookAt(eyeX,eyeY,eyeZ,
0,0,0,
0,1000,0);
//glTranslated (0.0, 0.0, -10.0);
//glColor3d (0.0, 0.0, 1.0);
//glScaled (300.0, 300.0, 300.0);
glBegin (GL_POLYGON);
glColor3d(1,0,0);
glVertex3d (-300, -300, 0.0);
glColor3d(0,1,0);
glVertex3d (300 + 10, -300, 0.0);
glColor3d(0,0,1);
glVertex3d (0, 300, 0.0);
glColor3d(1,1,1);
glVertex3d (0, 0, 100);
glColor3d(0,1,0);
glVertex3d (300 + 10, -300, 0.0);
glEnd ();
axes();
glColor3d(0,0,1);
glScaled(300,300,300);
glPolygonMode(GL_FRONT, GL_LINE);
glPolygonMode(GL_BACK, GL_LINE);
torus(12, 20, 4, 1, 0.1);
vhc::util::cylinder(0.1, 0, 2, 12, 20);
glPolygonMode(GL_FRONT, GL_FILL);
glPolygonMode(GL_BACK, GL_FILL);
}
void GLWidget::resizeGL (int width, int height) {
glViewport (0, 0, width, height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glOrtho (-width, width, -height, height, -1000.0, 1000.0);
glMatrixMode (GL_MODELVIEW);
}
void GLWidget::mousePressEvent (QMouseEvent* event) {
}
void GLWidget::mouseReleaseEvent (QMouseEvent* event) {
}
void GLWidget::keyPressEvent (QKeyEvent* event) {
switch (event->key()) {
case Qt::Key_Escape:
qApp->quit();
break;
case Qt::Key_Up:
eyeZ += 10;
break;
case Qt::Key_Down:
eyeZ -= 10;
break;
case Qt::Key_Right:
eyeX += 10;
break;
case Qt::Key_Left:
eyeX -= 10;
break;
case Qt::Key_R:
eyeX = 0;
eyeY = 0;
eyeZ = 10;
break;
default:
break;
}
repaint();
}
void GLWidget::keyReleaseEvent (QKeyEvent* event) {
}
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