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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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126
hilbert.c
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@ -6,26 +6,36 @@
#include <SDL/SDL.h> #include <SDL/SDL.h>
#include <GL/gl.h> #include <GL/gl.h>
#include <GL/glu.h> #include <GL/glu.h>
#include <math.h>
/* constants */ /* constants */
#define SEGMENTS 16 #define SEGMENTS 16
#define WIDTH 800 #define WIDTH 800
#define HEIGHT 600 #define HEIGHT 600
/* macros */
#define keepingMatrix(x) { glPushMatrix(); x; glPopMatrix(); }
/* functions */ /* functions */
void usage(void); void usage(void);
void initgl(void); void initgl(void);
void display(void); void display(void);
void mainloop(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 */ /* global variables */
int level = 2; int level = 1;
float size = 0.4; float size = 0.4;
SDL_Surface * sdlScreen; SDL_Surface * sdlScreen;
int winWidth = WIDTH; int winWidth = WIDTH;
int winHeight = HEIGHT; 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[]) int main(int argc, char *argv[])
{ {
@ -68,6 +78,7 @@ int main(int argc, char *argv[])
SDL_WM_SetCaption(argv[0], argv[0]); SDL_WM_SetCaption(argv[0], argv[0]);
initgl(); initgl();
initLists();
mainloop(); mainloop();
return 0; return 0;
@ -102,42 +113,125 @@ void initgl(void)
{ {
glClearColor (0.0, 0.0, 0.0, 0.0); glClearColor (0.0, 0.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST); glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glShadeModel(GL_SMOOTH); glShadeModel(GL_SMOOTH);
glViewport(0, 0, winWidth, winHeight); glViewport(0, 0, winWidth, winHeight);
glMatrixMode(GL_PROJECTION); glMatrixMode(GL_PROJECTION);
glLoadIdentity(); glLoadIdentity();
gluPerspective(60.0, (GLfloat)winHeight/(GLfloat)winWidth, 1.0, 30.0); gluPerspective(60.0, 1, 0.01, 3000.0);
glMatrixMode(GL_MODELVIEW); glMatrixMode(GL_MODELVIEW);
glLoadIdentity(); 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) void display(void)
{ {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glCallList(hilbertList);
SDL_GL_SwapBuffers();
}
if (displayList >= 0) void drawHilbert(int level, float size, int cap1, int cap2)
{ {
glCallList(displayList); 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 else
{ {
displayList = glGenLists(1); tlRtDrwCyl(-0.5, -1.0, -0.5, 90, 1.0, 0.0, 0.0);
if (displayList < 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"); fprintf(stderr, "Error allocating display list!\n");
exit(132); exit(132);
} }
glNewList(displayList, GL_COMPILE_AND_EXECUTE);
drawHilbert(); /* get a quadric object to draw with */
q = gluNewQuadric();
/* draw a sphere */
glNewList(sphereList, GL_COMPILE);
gluSphere(q, size, SEGMENTS, SEGMENTS/2);
glEndList(); glEndList();
}
SDL_GL_SwapBuffers(); /* draw a cylinder */
} glNewList(cylList, GL_COMPILE);
gluCylinder(q, size, size, 0.25, SEGMENTS, SEGMENTS/4);
glEndList();
void drawHilbert() /* draw Hilbert curve */
{ glNewList(hilbertList, GL_COMPILE);
drawHilbert(level, size, 1, 1);
glEndList();
/* free quadric memory */
gluDeleteQuadric(q);
} }
void usage(void) void usage(void)