title: Delphi sprites (knob)
body: <p>I'm currently designing a GUI that should contain a knob. </p>
  
  <p>The png file is kind of like a "motion-picture"-stacked (in lack of better words).</p>
  
  <p>Let's assume the image is 32 in length,, and each knob is 32 in height: I need the code 
  to go down 32 per turn. So at default the Timage is showing 32x32 of the image, but when the knob is turned up (By mouseclick and moving the mouse upwards) it shows 32x64 of the png and so on. </p>
  
  <p>How would i proceed to do this ? I know I could render each image individually, and then change image one by one, but that seems like a bad way. </p>