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git-svn-id: svn://anubis/misc/hilbert@15 bd8a9e45-a331-0410-811e-c64571078777
This commit is contained in:
josh 2007-10-26 02:56:50 +00:00
parent 270a1ac5a7
commit a8702d3528
1 changed files with 118 additions and 24 deletions
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142
hilbert.c
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@ -6,26 +6,36 @@
#include <SDL/SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <math.h>
/* constants */
#define SEGMENTS 16
#define WIDTH 800
#define HEIGHT 600
/* macros */
#define keepingMatrix(x) { glPushMatrix(); x; glPopMatrix(); }
/* functions */
void usage(void);
void initgl(void);
void display(void);
void mainloop(void);
void drawHilbert();
void initLists(void);
void tlRtDrwCyl(float x, float y, float z, float a, float u, float v, float w);
void drawHilbert(int level, float size, int cap1, int cap2);
void drawHilbert1(int cap1, int cap2);
/* global variables */
int level = 2;
int level = 1;
float size = 0.4;
SDL_Surface * sdlScreen;
int winWidth = WIDTH;
int winHeight = HEIGHT;
int displayList = -1;
int hilbertList = -1;
int sphereList = -1;
int cylList = -1;
const float diffuse[4] = {0.9f, 0.6f, 0.1f, 1.0f};
int main(int argc, char *argv[])
{
@ -68,6 +78,7 @@ int main(int argc, char *argv[])
SDL_WM_SetCaption(argv[0], argv[0]);
initgl();
initLists();
mainloop();
return 0;
@ -102,42 +113,125 @@ void initgl(void)
{
glClearColor (0.0, 0.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glShadeModel(GL_SMOOTH);
glViewport(0, 0, winWidth, winHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, (GLfloat)winHeight/(GLfloat)winWidth, 1.0, 30.0);
gluPerspective(60.0, 1, 0.01, 3000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -3.6);
gluLookAt(10, -10, 10,
0, 0, 0,
0, 0, 1);
/* set up materials */
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, diffuse);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (displayList >= 0)
{
glCallList(displayList);
}
else
{
displayList = glGenLists(1);
if (displayList < 0)
{
fprintf(stderr, "Error allocating display list!\n");
exit(132);
}
glNewList(displayList, GL_COMPILE_AND_EXECUTE);
drawHilbert();
glEndList();
}
glCallList(hilbertList);
SDL_GL_SwapBuffers();
}
void drawHilbert()
void drawHilbert(int level, float size, int cap1, int cap2)
{
if (level == 1)
{
drawHilbert1(cap1, cap2);
}
}
void drawHilbert1(int cap1, int cap2)
{
if (cap1)
{
keepingMatrix(
glTranslatef(-0.5f, -0.5f, -0.5f);
glCallList(sphereList);
)
}
else
{
tlRtDrwCyl(-0.5, -1.0, -0.5, 90, 1.0, 0.0, 0.0);
tlRtDrwCyl(-0.5, -0.5, -0.5, 90, 1.0, 0.0, 0.0);
}
if (cap2)
{
keepingMatrix(
glTranslatef(0.5f, 0.5f, 0.5f);
glCallList(sphereList);
)
}
else
{
tlRtDrwCyl(-0.5, -1.0, 0.5, 90, 1.0, 0.0, 0.0);
tlRtDrwCyl(-0.5, -0.5, 0.5, 90, 1.0, 0.0, 0.0);
}
glColor3f(0.2, 0.2, 1.0);
glDisable(GL_LIGHTING);
glBegin(GL_LINE_STRIP);
glVertex3f(-0.5, -0.5, -0.5);
glVertex3f(-0.5, 0.5, -0.5);
glVertex3f(0.5, 0.5, -0.5);
glVertex3f(0.5, -0.5, -0.5);
glVertex3f(0.5, -0.5, 0.5);
glVertex3f(0.5, 0.5, 0.5);
glVertex3f(-0.5, 0.5, 0.5);
glVertex3f(-0.5, -0.5, 0.5);
glEnd();
glEnable(GL_LIGHTING);
}
void tlRtDrwCyl(float x, float y, float z, float a, float u, float v, float w)
{
keepingMatrix(
glTranslatef(x, y, z);
glRotatef(a, u, v, w);
glCallList(cylList);
)
}
void initLists(void)
{
GLUquadric * q;
hilbertList = glGenLists(1);
sphereList = glGenLists(1);
cylList = glGenLists(1);
if (hilbertList < 0 || sphereList < 0 || cylList < 0)
{
fprintf(stderr, "Error allocating display list!\n");
exit(132);
}
/* get a quadric object to draw with */
q = gluNewQuadric();
/* draw a sphere */
glNewList(sphereList, GL_COMPILE);
gluSphere(q, size, SEGMENTS, SEGMENTS/2);
glEndList();
/* draw a cylinder */
glNewList(cylList, GL_COMPILE);
gluCylinder(q, size, size, 0.25, SEGMENTS, SEGMENTS/4);
glEndList();
/* draw Hilbert curve */
glNewList(hilbertList, GL_COMPILE);
drawHilbert(level, size, 1, 1);
glEndList();
/* free quadric memory */
gluDeleteQuadric(q);
}
void usage(void)