I am having trouble re-setting glPointSize. That is, when the program reaches the first glPointSize(x) it keeps that point size setting throughout the program. It doesn't matter where I place the next glPointSize() statement or what size I choose the program creates points based on that first setting. Here is my code.. the first point size is set to 5.0 under the curMode == OPENGL if block. If I change modes to DDA or BESENHAM instead of drawing the points at 1.0 they are drawn at 5.0. Thanks for any advice. void doDisplay (void) { int iX, iCount, dX, dY, iSteps; float xIncrement, yIncrement, x, y; glClear(GL_COLOR_BUFFER_BIT); if (curMode == OPENGL) { glColor3f(0.0, 1.0, 0.0); glLineWidth(3.0); glBegin(GL_LINE_STRIP); for (iX = 0;iX < curPos; iX++) { glVertex2i(gx[iX], gy[iX]); } glEnd(); glColor3f(1.0, 0.0, 0.0); glPointSize(5.0); glBegin(GL_POINTS); for (iX = 0;iX < curPos; iX++) { glVertex2i(gx[iX], gy[iX]); } glEnd(); } if (curMode == DDA) { glViewport(0,0,600,400); glBegin(GL_POINTS); glColor3f(0.0, 1.0, 0.0); glPointSize(1.0); if (curPos > 1) { for (iCount=0;iCount<curPos-1;iCount++) { dX = gx[iCount+1] - gx[iCount]; dY = gy[iCount+1] - gy[iCount]; x = gx[iCount]; y = gy[iCount]; if ( fabs(dX) > fabs(dY) ) iSteps = fabs(dX); else iSteps = fabs(dY); xIncrement = float(dX) / float(iSteps); yIncrement = float(dY) / float(iSteps); for (iX=0;iX<iSteps;iX++) { x += xIncrement; y += yIncrement; glVertex2i( round(x), round(y) ); } } } glColor3f(1.0, 0.0, 0.0); glPointSize(5.0); for (iX=0;iX<curPos;iX++) { glVertex2i( gx[iX], gy[iX] ); } glEnd(); } if (curMode == BRESENHAM) { glViewport(0,0,600,400); glBegin(GL_POINTS); glColor3f(0.0, 1.0, 0.0); glPointSize(1.0); if (curPos > 1) { for (iX=0;iX<curPos-1;iX++) { doBresenham(gx[iX], gy[iX], gx[iX+1], gy[iX+1]); } } glColor3f(1.0, 0.0, 0.0); glPointSize(5.0); for (iX=0;iX<curPos;iX++) { glVertex2i( gx[iX], gy[iX] ); } glEnd(); } glFlush(); }

Thanks.. that worked.

Now I'm trying to fix this damn Besenham's algorithm to work with steep slopes. Would be great if someone new whats missing. Thanks.