//fungsi rekursif hilbert dengan pola-pola tertentu
void drawHilbert(int *x, int *y, int lengthX, int lengthY, int lvl){
if(lvl>0){
drawHilbert (x, y, lengthY, lengthX, lvl-1);
lineForward (x, y, lengthX, -lengthY, BLACK);
drawHilbert (x, y, lengthX, lengthY, lvl-1);
lineForward (x, y, lengthY, -lengthX, BLACK);
drawHilbert (x, y, lengthX, lengthY, lvl-1);
lineForward (x, y, -lengthX, lengthY, BLACK);
drawHilbert (x, y, -lengthY, -lengthX, lvl-1);
}
}
void display(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
drawText();
glCallList(textList);
if (displayFFT) {
glPushMatrix();
glCallList(fftList);
glPopMatrix();
glPointSize(pSize);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_DOUBLE, sizeof(point), fftPointList);
glColorPointer(4, GL_FLOAT, sizeof(point), &fftPointList[0].r);
glDrawArrays(GL_LINES, 0, fftN);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
}
if (displayHilbert) {
drawHilbert();
}
glPushMatrix();
glTranslatef(xx, yy, -zoom);
glRotatef(rotx, 1.0, 0.0, 0.0);
glRotatef(roty, 0.0, 1.0, 0.0);
glRotatef(rotz, 0.0, 0.0, 1.0);
GLfloat ambient1[] = {0.15f, 0.15f, 0.15f, 1.0f};
GLfloat diffuse1[] = {0.8f, 0.8f, 0.8f, 1.0f};
GLfloat specular1[] = {1.0f, 1.0f, 1.0f, 1.0f};
GLfloat position1[] = {0.0f, 0.0f, 24.0f, 1.0f};
glLightfv(GL_LIGHT1, GL_AMBIENT, ambient1);
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse1);
glLightfv(GL_LIGHT1, GL_DIFFUSE, specular1);
glLightfv(GL_LIGHT1, GL_POSITION, position1);
glEnable(GL_LIGHT1);
drawAxes();
glPointSize(pSize);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_DOUBLE, sizeof(point), pointsList);
glColorPointer(4, GL_FLOAT, sizeof(point), &pointsList[0].r);
glDrawArrays(GL_POINTS, 0, sampleSize);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
glutPostRedisplay();
glutSwapBuffers();
}
int main(){
init();
char title[22] = "Hilbert Curve Level 1"; //title window
int x, y, length;
int lvl = 1; //level mula-mula 1
set_window_title("Hilbert Curve");
allegro_message("Hilbert Curve\n(C) 2008 by A Ninja @ Junior IT");
allegro_message("Press UP / DOWN to change level\nPress ESC to Exit");
do{
//koordinat awal adalah (10, 590) dan mula-mula panjang per garis
//lurus adalah 512 px
x = 10, y = 590, length = 512;
//panjang akan dibagi dua sebanyak lvl kali
//jika lebih dari atau sama dengan 8 px
for(int i=1; i<=lvl; i++)
if(length >= 8) length /= 2;
title[20] = lvl+48;
title[21] = '\0';
set_window_title(title);
//bersihkan layar menjadi putih
clear_to_color(screen, WHITE);
drawHilbert(&x, &y, 0, length, lvl);
do{
readkey();
}while(!key[KEY_UP] && !key[KEY_DOWN] && !key[KEY_ESC]);
//jika tombol UP ditekan, maka level akan bertambah
if(key[KEY_UP] && lvl<9) lvl++;
//jika tombol DOWN ditekan, maka level akan berkurang
else if(key[KEY_DOWN] && lvl>1) lvl--;
}while(!key[KEY_ESC]);
allegro_message("Thanks and good-bye ^_^");
deinit();
return 0;
}
