int main()
{
struct Coord top, left, right;
left.x = -1;
left.y = 1;
top.x = 0;
top.y = -1;
right.x = 1;
right.y = 1;
drawSierpinski(0, left, top, right);
printf("index = %d, %d\n", index, rand_interval(0,255));
int tri = 0;
for (int i = 0; i < 120; i++){
for (int j = 0; j < 2; j++){
printf("(%f,%f,%d) ", verticesX[i][j], verticesY[i][j], rand_interval(0, 255));
}
printf("\nColor = (%f,%f,%f)", colors[i][0], colors[i][1], colors[i][2]);
getch();
printf("\n");
}
getch();
}
void drawSierpinski(int iter, struct Coord a, struct Coord b, struct Coord c)
{
if (iter >= 8) // if lines are only 2 pixels in length
{
return;
}
else
{
drawSierpinski(iter + 1, a, mid(a, b), mid(a, c));
verticesX[index][0] = a.x;
verticesX[index][1] = mid(a, b).x;
verticesX[index][2] = mid(a, c).x;
verticesY[index][0] = a.y;
verticesY[index][1] = mid(a, b).y;
verticesY[index][2] = mid(a, c).y;
colors[index][0] = scale(rand_interval(0, 255),0,255,0,1);
colors[index][1] = scale(rand_interval(0, 255), 0, 255, 0, 1);
colors[index][2] = scale(rand_interval(0, 255), 0, 255, 0, 1);
drawSierpinski(iter + 1, mid(a, b), b, mid(b, c));
index++;
verticesX[index][0] = mid(a, b).x;
verticesX[index][1] = b.x;
verticesX[index][2] = mid(b, c).x;
verticesY[index][0] = mid(a, b).y;
verticesY[index][1] = b.y;
verticesY[index][2] = mid(b, c).y;
colors[index][0] = scale(rand_interval(0, 255), 0, 255, 0, 1);
colors[index][1] = scale(rand_interval(0, 255), 0, 255, 0, 1);
colors[index][2] = scale(rand_interval(0, 255), 0, 255, 0, 1);
drawSierpinski(iter + 1, mid(a, c), mid(b, c), c);
index++;
verticesX[index][0] = mid(a, c).x;
verticesX[index][1] = mid(b, c).x;
verticesX[index][2] = c.x;
verticesY[index][0] = mid(a, c).y;
verticesY[index][1] = mid(b, c).y;
verticesY[index][2] = c.y;
colors[index][0] = scale(rand_interval(0, 255), 0, 255, 0, 1);
colors[index][1] = scale(rand_interval(0, 255), 0, 255, 0, 1);
colors[index][2] = scale(rand_interval(0, 255), 0, 255, 0, 1);
}
}
void drawSierpinski(Point a, Point b, Point c, int level)
{ Point m0, m1, m2;
//Example rendering function
if (level > 0)
{
m0.x = (a.x+b.x) /2.0;
m0.y = (a.y+b.y) /2.0;
m1.x = (a.x+c.x) /2.0;
m1.y = (a.y+c.y) /2.0;
m2.x = (b.x+c.x) /2.0;
m2.y = (c.y+b.y) /2.0;
drawSierpinski(a,m0,m1,level-1);
drawSierpinski(b,m2,m0,level-1);
drawSierpinski(c,m1,m2,level-1);
}
else
drawTriangle(a,b,c);
} // end draw Sierpinski
void myMouse(int button, int state, int x, int y){
const int size = 3;
static int clickCount = 0;
static GLIntPoint points[size];
if(button == GLUT_LEFT_BUTTON &&
state == GLUT_DOWN &&
clickCount < size){
points[clickCount].x = x;
points[clickCount].y = HEIGHT - y;
drawDot(points[clickCount]);
clickCount++;
if(clickCount == size){
drawSierpinski(points,size);
}
}
}
GLuint makeObject()
{
//Preparing example rendering
GLuint list;
list = glGenLists(1);
glNewList(list, GL_COMPILE);
// set the initial color
glColor3f( 1.0, 0.0, 0.0 );
// points for triangle to draw Sierpinski Gasket
Point a, b, c;
a.x=-0.8f;
a.y=-0.8f;
b.x=0.8f;
b.y=-0.8f;
c.x=0.0f;
c.y=0.8f;
drawSierpinski(a,b,c,4);
glEndList();
return list;
} // end make object
void GLDraw::drawSierpinski(int depth, float size, float modifier)
{
glPushMatrix();
if ( depth > 0 )
{
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
glTranslatef(size/3.0, 0.0f, modifier);
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
glTranslatef(size/3.0, 0.0f, modifier);
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
glTranslatef( -size + 0.5 * size, (sqrt(3) * size/3.0) / 2.0, modifier);
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
glTranslatef( size/3.0, 0.0f, modifier);
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
glTranslatef( -0.5 * size/3.0, (sqrt(3) * size/3.0) / 2.0, modifier);
drawTriangle(size/3.0);
drawSierpinski(depth-1, size/3.0, modifier);
depth--;
}
glPopMatrix();
}
