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// A simple OpenGL graph renderer.
// -- norly.
#include <stdlib.h>
#include <GL/glut.h>
#include "graph.h"
#include "glancillary.h"
enum MOUSE_MODES {
MOUSE_IDLE,
MOUSE_ROTATING,
MOUSE_TRANSLATING,
MOUSE_TRANSLATING2,
MOUSE_DRAGGING
};
enum MOUSE_MODES mouse_mode = MOUSE_IDLE;
int mouse_x, mouse_y;
GLfloat cameramat[16];
// The graph itself.
grGraph *g = NULL;
/****************************
* GLUT window event handlers
***************************/
void on_display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set up the camera
glLoadMatrixf(cameramat);
// Draw the old example objects
glaDrawExample();
// Draw the graph
graphDrawGL(g);
glFlush();
glutSwapBuffers();
}
void on_reshape(int w, int h)
{
// Set up the Viewport transformation
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
// Set up the Projection transformation
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90, (GLfloat)w/(GLfloat)h, 0.0, 5.0);
// Switch to Model/view transformation for drawing objects
glMatrixMode(GL_MODELVIEW);
}
/****************************
* GLUT input event handlers
***************************/
void on_keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 27:
case 'Q':
case 'q':
exit(0);
break;
case 'a':
glaCameraTranslatef(cameramat, 1.0, 0.0, 0.0);
break;
case 'd':
glaCameraTranslatef(cameramat, -1.0, 0.0, 0.0);
break;
case 'w':
glaCameraTranslatef(cameramat, 0.0, 0.0, 1.0);
break;
case 's':
glaCameraTranslatef(cameramat, 0.0, 0.0, -1.0);
break;
case '=':
//glScalef(1.5, 1.5, 1.5);
break;
case '-':
//glScalef(1/1.5, 1/1.5, 1/1.5);
break;
}
glutPostRedisplay();
}
void on_specialKeyboard(int key, int x, int y)
{
switch (key)
{
case GLUT_KEY_LEFT:
glaCameraRotatef(cameramat, -15.0, 0.0, 1.0, 0.0);
break;
case GLUT_KEY_UP:
glaCameraTranslatef(cameramat, 0.0, -1.0, 0.0);
break;
case GLUT_KEY_RIGHT:
glaCameraRotatef(cameramat, 15.0, 0.0, 1.0, 0.0);
break;
case GLUT_KEY_DOWN:
glaCameraTranslatef(cameramat, 0.0, 1.0, 0.0);
break;
}
glutPostRedisplay();
}
void on_mousebutton(int button, int state, int x, int y)
{
if (state == GLUT_DOWN && button == GLUT_LEFT_BUTTON)
{
if (mouse_mode != MOUSE_IDLE)
return;
switch(glutGetModifiers())
{
case 0: // When no modifiers are pressed
//mouse_mode = MOUSE_DRAGGING;
//glaSelect(x, y);
//break;
case GLUT_ACTIVE_SHIFT:
mouse_mode = MOUSE_ROTATING;
break;
case GLUT_ACTIVE_SHIFT | GLUT_ACTIVE_CTRL:
mouse_mode = MOUSE_TRANSLATING;
break;
case GLUT_ACTIVE_CTRL:
mouse_mode = MOUSE_TRANSLATING2;
break;
}
mouse_x = x;
mouse_y = y;
}
else if (state == GLUT_UP)
mouse_mode = MOUSE_IDLE;
}
void on_mousemove(int x, int y)
{
int dx, dy;
if (mouse_mode != MOUSE_IDLE)
{
dx = x - mouse_x;
dy = y - mouse_y;
mouse_x = x;
mouse_y = y;
glPushMatrix();
glLoadIdentity();
switch(mouse_mode)
{
case MOUSE_TRANSLATING:
glTranslatef((0.1) * dx, (-0.1) * dy, 0.0);
break;
case MOUSE_TRANSLATING2:
glRotatef(dx, 0.0, 1.0, 0.0);
glTranslatef(0.0, 0.0, (-0.1) * dy);
break;
case MOUSE_ROTATING:
glRotatef(dx, 0.0, 1.0, 0.0);
glRotatef(dy, 1.0, 0.0, 0.0);
break;
case MOUSE_DRAGGING:
case MOUSE_IDLE:
break;
}
glMultMatrixf(cameramat);
glGetFloatv(GL_MODELVIEW_MATRIX, cameramat);
glPopMatrix();
}
glutPostRedisplay();
}
/****************************
* Main function
***************************/
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow (argv[0]);
// Init graph and GL
g = grAlloc(1000, 6000);
srand(0);
grGenRandom(g);
glaInit ();
// Init camera matrix
glMatrixMode(GL_MODELVIEW);
gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
glGetFloatv(GL_MODELVIEW_MATRIX, cameramat);
glLoadIdentity();
// Register callbacks
glutDisplayFunc(on_display);
glutReshapeFunc(on_reshape);
glutKeyboardFunc(on_keyboard);
glutSpecialFunc(on_specialKeyboard);
glutMouseFunc(on_mousebutton);
glutMotionFunc(on_mousemove);
glutMainLoop();
grFree(g);
return 0;
}
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