void Tree::FractalTree(int branch, int depth, int x, int y, int z)
{
if(depth < MaxDepth)
{
glColor3f(0.4, 0.2, 0);
glRotatef(data[branch][depth][0], data[branch][depth][1], data[branch][depth][2], 0);
glTranslatef(x, y, z - height);
glutSolidCylinder(0.05, height, 5, 2);
glPushMatrix();
glRotatef(rand() / (float)RAND_MAX * 10, 0, rand() / (float)RAND_MAX, 0);
for(int i = 0; i < MaxLeaf; i++)
{
glPushMatrix();
glColor3f(0, rand()/(float)RAND_MAX * 0.5 + 0.5, 0);
float pos = leafData[branch][depth][i][0];
glTranslatef(leafData[branch][depth][i][1], leafData[branch][depth][i][2], -pos);
glutSolidSphere(LeafWidth, 3, 2);
glPopMatrix();
}
glPopMatrix();
FractalTree(branch, depth + 1, x, y, z);
}
}
/*
* recursive tree drawing thing, fleshed out from class notes pseudocode
*/
void FractalTree(int level)
{
long savedseed; /* need to save seeds while building tree too */
if (level == Level) {
glPushMatrix();
glRotatef(drand48()*180, 0, 1, 0);
glCallList(STEMANDLEAVES);
glPopMatrix();
} else {
glCallList(STEM);
glPushMatrix();
glRotatef(drand48()*180, 0, 1, 0);
glTranslatef(0, 1, 0);
glScalef(0.7, 0.7, 0.7);
savedseed = (long) drand48()*ULONG_MAX; /* recurse on a 3-way branching */
glPushMatrix();
glRotatef(110 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
glPopMatrix();
srand48(savedseed);
savedseed = (long) drand48()*ULONG_MAX;
glPushMatrix();
glRotatef(-130 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
glPopMatrix();
srand48(savedseed);
glPushMatrix();
glRotatef(-20 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
glPopMatrix();
glPopMatrix();
}
}
/*
* draw and build display list for tree
*/
void CreateTree(void)
{
srand48(TreeSeed);
glNewList(TREE, GL_COMPILE);
glPushMatrix();
glPushAttrib(GL_LIGHTING_BIT);
glCallList(TREE_MAT);
glTranslatef(0, 0, 0);
FractalTree(2);
glPopAttrib();
glPopMatrix();
glEndList();
}
void Tree::Render()
{
glColor3f(0.4, 0.2, 0);
glRotatef(90, 1, 0, 0);
glTranslatef(0, 0, -height);
glutSolidCylinder(0.05, height, 5, 2);
for(int i = 0; i < MaxBranch; i++)
{
glPushMatrix();
FractalTree(i, 0, 0, height, 0);
glPopMatrix();
}
glEnd();
}
