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Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..7825a2d --- /dev/null +++ b/src/main.c @@ -0,0 +1,231 @@ +// 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; +} |