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Fixed 'Fractal' demo. Tree's were not random at all.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7961 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Matthias Melcher 2010-12-06 15:39:31 +00:00
parent 2da2153c77
commit 52fcab2607
1 changed files with 8 additions and 9 deletions
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17
test/fractals.cxx
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@ -312,7 +312,7 @@ long TreeSeed; /* for srand48 - remember so we can build "same tree"
/*
* recursive tree drawing thing, fleshed out from class notes pseudocode
*/
void FractalTree(int level)
void FractalTree(int level, long level_seed)
{
long savedseed; /* need to save seeds while building tree too */
@ -328,26 +328,25 @@ void FractalTree(int level)
glTranslatef(0, 1, 0);
glScalef(0.7, 0.7, 0.7);
savedseed = (long)((ulong)drand48()*ULONG_MAX);
srand48(level_seed+1);
glPushMatrix();
glRotatef(110 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
FractalTree(level + 1, level_seed+4);
glPopMatrix();
srand48(savedseed);
savedseed = (long)((ulong)drand48()*ULONG_MAX);
srand48(level_seed+2);
glPushMatrix();
glRotatef(-130 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
FractalTree(level + 1, level_seed+5);
glPopMatrix();
srand48(savedseed);
srand48(level_seed+3);
glPushMatrix();
glRotatef(-20 + drand48()*40, 0, 1, 0);
glRotatef(30 + drand48()*20, 0, 0, 1);
FractalTree(level + 1);
FractalTree(level + 1, level_seed+6);
glPopMatrix();
glPopMatrix();
@ -421,7 +420,7 @@ void CreateTree(void)
glPushAttrib(GL_LIGHTING_BIT);
glCallList(TREE_MAT);
glTranslatef(0, -1, 0);
FractalTree(0);
FractalTree(0, TreeSeed);
glPopAttrib();
glPopMatrix();
glEndList();