How to make a smooth animation using inline scripts?

Comments

• eduard

  February 2021

  Hi,

  You can use the command canvas.clear() , inside the while loop. That deletes the previous canvas on every iteration, so that only the current canvas appears. Can you try this? If it doesn't work nicely, there is another trick that smooth things out.

  Eduard

  
• gvh

  February 2021

  Dear @eduard ,

  
  

  When I use the canvas.clear() function it works, but it is quite "stuttery". I think the refresh rate is too low to create smooth movements. Any idea how I can increase the refresh rate aside from making the animation slower?
• gvh

  February 2021

  Dear @eduard ,

  I also get the following warnings sometimes:

  

  Which indicates that canvas.show() has sometimes troubles with consistent showing. This can also be seen in the original figure I posted where you can see that 2 times the ball "moved" further than usual.
• eduard

  February 2021

  The problem is that you call canvas.image() on every loop iteration. This is quite an expensive operation, so whenever possible try to avoid it. I attach an example that makes use of named canvas elements. I hope this helps.

  Eduard

  Newexperiment.osexp

  
  

  
• gvh

  February 2021

  Dear @eduard ,

  
  

  Quite a convincing example, I'll look into it.

  
  

  Many thanks!
• gvh

  February 2021 edited February 2021

  @eduard ,

  It works perfectly!

  I'll just copy my code here so that if somebody else has the same problem, they can look at it here.

  Step 1: Initialise the image:

  

  Step 2: Change the x and y coordinates of this image:

  

  Or, if you use a function for the animation:

  

  which can be called like this:

  
• lvanderlinden

  February 2021

  Hi @gvh , thank you very much for sharing! :)

  Did you like my answer? Feel free to
• gvh

  February 2021

  @lvanderlinden , nothing more frustrating than finding a thread with your exact problem where the last message is "Thanks, I fixed it!" with no explanation