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| /* spin.c */ |
| |
| |
| /* |
| * Spinning box. This program is in the public domain. |
| * |
| * Brian Paul |
| */ |
| |
| |
| #include <math.h> |
| #include <stdio.h> |
| |
| #include <GL/glx.h> |
| #include <GL/gl.h> |
| #include "ui.h" |
| |
| |
| |
| |
| static GLfloat Xrot, Xstep; |
| static GLfloat Yrot, Ystep; |
| static GLfloat Zrot, Zstep; |
| static GLfloat Step = 5.0; |
| static GLfloat Scale = 1.0; |
| static GLuint Object; |
| |
| |
| |
| |
| static GLuint make_object( void ) |
| { |
| GLuint list; |
| |
| list = glGenLists( 1 ); |
| |
| glNewList( list, GL_COMPILE ); |
| |
| glBegin( GL_LINE_LOOP ); |
| glColor3f( 1.0, 1.0, 1.0 ); |
| glVertex3f( 1.0, 0.5, -0.4 ); |
| glColor3f( 1.0, 0.0, 0.0 ); |
| glVertex3f( 1.0, -0.5, -0.4 ); |
| glColor3f( 0.0, 1.0, 0.0 ); |
| glVertex3f( -1.0, -0.5, -0.4 ); |
| glColor3f( 0.0, 0.0, 1.0 ); |
| glVertex3f( -1.0, 0.5, -0.4 ); |
| glEnd(); |
| |
| glColor3f( 1.0, 1.0, 1.0 ); |
| |
| glBegin( GL_LINE_LOOP ); |
| glVertex3f( 1.0, 0.5, 0.4 ); |
| glVertex3f( 1.0, -0.5, 0.4 ); |
| glVertex3f( -1.0, -0.5, 0.4 ); |
| glVertex3f( -1.0, 0.5, 0.4 ); |
| glEnd(); |
| |
| glBegin( GL_LINES ); |
| glVertex3f( 1.0, 0.5, -0.4 ); glVertex3f( 1.0, 0.5, 0.4 ); |
| glVertex3f( 1.0, -0.5, -0.4 ); glVertex3f( 1.0, -0.5, 0.4 ); |
| glVertex3f( -1.0, -0.5, -0.4 ); glVertex3f( -1.0, -0.5, 0.4 ); |
| glVertex3f( -1.0, 0.5, -0.4 ); glVertex3f( -1.0, 0.5, 0.4 ); |
| glEnd(); |
| |
| |
| glEndList(); |
| |
| return list; |
| } |
| |
| |
| |
| void reshape( int width, int height ) |
| { |
| glViewport(0, 0, (GLint)width, (GLint)height); |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 ); |
| glMatrixMode(GL_MODELVIEW); |
| } |
| |
| |
| GLenum key(int k, GLenum mask) |
| { |
| switch (k) { |
| case KEY_ESCAPE: |
| exit(0); |
| } |
| return GL_FALSE; |
| } |
| |
| |
| void draw( void ) |
| { |
| glClear( GL_COLOR_BUFFER_BIT ); |
| |
| glPushMatrix(); |
| |
| glTranslatef( 0.0, 0.0, -10.0 ); |
| glScalef( Scale, Scale, Scale ); |
| if (Xstep) { |
| glRotatef( Xrot, 1.0, 0.0, 0.0 ); |
| } |
| else if (Ystep) { |
| glRotatef( Yrot, 0.0, 1.0, 0.0 ); |
| } |
| else { |
| glRotatef( Zrot, 0.0, 0.0, 1.0 ); |
| } |
| |
| glCallList( Object ); |
| |
| glPopMatrix(); |
| |
| glFlush(); |
| tkSwapBuffers(); |
| } |
| |
| |
| void idle( void ) |
| { |
| Xrot += Xstep; |
| Yrot += Ystep; |
| Zrot += Zstep; |
| |
| if (Xrot>=360.0) { |
| Xrot = Xstep = 0.0; |
| Ystep = Step; |
| } |
| else if (Yrot>=360.0) { |
| Yrot = Ystep = 0.0; |
| Zstep = Step; |
| } |
| else if (Zrot>=360.0) { |
| Zrot = Zstep = 0.0; |
| Xstep = Step; |
| } |
| draw(); |
| } |
| |
| void init(void) |
| { |
| Object = make_object(); |
| glCullFace( GL_BACK ); |
| /* glEnable( GL_CULL_FACE );*/ |
| glDisable( GL_DITHER ); |
| glShadeModel( GL_FLAT ); |
| /* glEnable( GL_DEPTH_TEST ); */ |
| |
| Xrot = Yrot = Zrot = 0.0; |
| Xstep = Step; |
| Ystep = Zstep = 0.0; |
| } |
| |
| |
| int main( int argc, char *argv[] ) |
| { |
| return ui_loop(argc, argv, "spin"); |
| } |