winforms - How to smoothly move image automatically? in c# -

i want implement code image flows in endless loop background. this. prepared 2 image object(picture box).

i implement move-image-code below. ( cleaned inessential code in topic)

private void initializecomponent() {     this.p1.image = ((system.drawing.image)(resources.getobject("picture")));     this.p1.location = new system.drawing.point(0, -1000); // 0,0 // 0, -1000     this.p1.size = new system.drawing.size(1000, 1000);      this.p2.image = ((system.drawing.image)(resources.getobject("picture")));     this.p2.location = new system.drawing.point(0, 1000); // 0,0 // 0, -1000     this.p2.size = new system.drawing.size(1000, 1000);      t1 = new thread(new parameterizedthreadstart(loop));     t1.start(); }  private void loop(object o) {     ctmethod cttest = new ctmethod(movepicturebox);     while (true)     {         try         {             this.invoke(cttest);             thread.sleep(10); // updated..         } catch(exception e) {             break;        }     } }  private void movepicturebox() {      if (p1.top == 0)     {         p2.top = p1.top-p2.height;     }      if (p2.top == 0)     {         p1.top = p2.top-p1.height;     }      p1.top++; } 

this code works well. i've encountered problems. link line(connected line) of 2 images looks stuttering or shaking occasionally. don't know why images move that. have relations lerp(interpolation)? if knows reason, me please?

this might because you're using system.drawing.point

http://msdn.microsoft.com/en-us/library/system.drawing.point%28v=vs.110%29.aspx

this means position determined system.drawing.point snap whole numbers, causing one-pixel jumps during animations.

you might want use system.drawing.pointf (since uses floating point numbers rather integers)

the same goes system.drawing.size, describes width , height in integers

msdn on system.drawing.size

unfortunately, winforms controls (as rotem pointed out) use system.drawing.point, making them inherently unsuitable smooth animation.

you're better off drawing pictures right graphics object.