// Center of tree
void centerBranch(int depth) {
int terminatingBranch = 0;
if (depth == 0) {
translateBy(0, 5 * (1.0 / scaleFactor), 0);
terminatingLeaf();
return;
} // if
if (depth == 1) {
terminatingBranch = TERM;
} // if
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(CENTER, depth);
// Left branch
pushMatrix();
turnLeft();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(LEFT | terminatingBranch, depth);
leftBranch(depth - 1);
popMatrix();
// 3D left branch
pushMatrix();
rotateBy(90, 0, 1, 0);
rotateBy(15, 0, 0, 1);
translateBy(1, 0, 0);
turnLeft();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(LEFT | terminatingBranch, depth);
leftBranch(depth - 1);
popMatrix();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(CENTER, depth);
// Right branch
pushMatrix();
turnRight();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(RIGHT | terminatingBranch, depth);
rightBranch(depth - 1);
popMatrix();
// 3D right branch
pushMatrix();
rotateBy(90, 0, 1, 0);
rotateBy(-15, 0, 0, 1);
translateBy(-1, 0, 0);
turnRight();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(RIGHT | terminatingBranch, depth);
rightBranch(depth - 1);
popMatrix();
translateBy(0, 6 * (depth * 1.0 / scaleFactor), 0);
drawBranch(CENTER | TERM, depth);
centerBranch(depth - 1);
} // centerBranch
/**
* Before calling the recursive L-system, draws the tree trunk to the screen.
* It's supposed to resemble a hexagonal cylinder (which is more realistic
* than a box!)
*/
void initialize(void) {
// Draw the trunk
GLfloat vertices[] = { 1.0, 0.0, -2.0,
2.0, 0.0, 0.0,
1.0, 0.0, 2.0,
-1.0, 0.0, 2.0,
-2.0, 0.0, 0.0,
-1.0, 0.0, -2.0,
// top vertices
1.0, 18.0, -1.0,
1.0, 18.0, 0.0,
1.0, 18.0, 1.0,
-1.0, 18.0, 1.0,
-1.0, 18.0, 0.0,
-1.0, 18.0, -1.0 };
GLuint indices[] = { 0, 1, 2, 3, 4, 5, // top
6, 7, 8, 9, 10, 11,// bottom
1, 7, 6, 0,
2, 8, 7, 1,
3, 9, 8, 2,
4, 10, 9, 3,
5, 11, 10, 4,
0, 6, 11, 5 };
translateBy(0, -39, 0);
int i;
int v1, v2, v3;
glColor3f(treeRed, treeGreen, treeBlue);
glBegin(GL_QUADS);
for (i = 0; i < 36; i++) {
v1 = indices[i] * 3;
v2 = indices[i] * 3 + 1;
v3 = indices[i] * 3 + 2;
glVertex3f(vertices[v1], vertices[v2], vertices[v3]);
} // for
glEnd();
translateBy(0, 12, 0);
} // initialize
void CC3Matrix::populateToLookAt( const CC3Vector& targetLocation, const CC3Vector& eyeLocation, const CC3Vector& upDirection )
{
CC3Vector fwdDir = targetLocation.difference( eyeLocation );
populateToPointTowards( fwdDir, upDirection );
transpose();
translateBy( eyeLocation.negate() );
m_isIdentity = false;
m_isRigid = true;
}
void ModelShow::mouseMoveEvent(QMouseEvent *event)
{
int dx=event->x()-lastPos.x();
int dy=event->y()-lastPos.y();
if(event->buttons() & Qt::LeftButton){
rotateBy(-8*dy,8*dx,0);
}
else if(event->buttons() & Qt::RightButton){
zoomBy(-0.01*dx);
}
else if(event->buttons() & Qt::MiddleButton){
translateBy(0.01*dx,0.01*dy,0);
}
lastPos=event->pos();
}
// Draw an apple! An apple's a fruit!
void drawFruit(void) {
translateBy(0, -2.5, 0);
glColor3f(1.0, 0.2, 0.04);
glutSolidSphere(1.5, 30, 30);
} // drawFruit
