MAYER-A@RICEVM1.BITNET (David Mayer) (11/02/90)
HELP!! I am writing an application which simulates analog instrument panel displays. A dynamic quickdrawn pointer sweeps across static parts of the display which is stored in a PICT resource. As the pointer moves across static stuff in the window, it erases it. I invalidate a region for updating and redraw the display in that region every time the pointer is moved. Trouble is that the pointer is moving quite often so updates are needed very frequently. Also, I determined from trial and error that rather than recalculate a new update region for each update, it is faster to store a region which encompasses all areas of the display which could ever need updating in a region and update that same region each update. Everything was great until I decided to reduce the size of my displays. Before I changed the size of the displays (and the associated update regions) updates were animation-smooth. Now, the displays are intolerably jerky. I can clearly see the update rectangles blinking each update. I have not changed anything in the code except the size of the rectangles that I store in the update region. Is there some secret to smooth updates that I need to know?? Any help would be appreciated. Thanks. David Mayer (MAYER-A@RICEVM1 Bitnet)
MAYER-A@RICEVM1.BITNET (David Mayer) (11/02/90)
HELP!! I am writing an application which simulates analog instrument panel displays. A dynamic quickdrawn pointer sweeps across static parts of the display which is stored in a PICT resource. As the pointer moves across static stuff in the window, it erases it. I invalidate a region for updating and redraw the display in that region every time the pointer is moved. Trouble is that the pointer is moving quite often so updates are needed very frequently. Also, I determined from trial and error that rather than recalculate a new update region for each update, it is faster to store a region which encompasses all areas of the display which could ever need updating in a region and update that same region each update. Everything was great until I decided to reduce the size of my displays. Before I changed the size of the displays (and the associated update regions) updates were animation-smooth. Now, the displays are intolerably jerky. I can clearly see the update rectangles blinking each update. I have not changed anything in the code except the size of the rectangles that I store in the update region. Is there some secret to smooth updates that I need to know?? Any help would be appreciated. Thanks. David Mayer (MAYER-A@RICEVM1 Bitnet)
mxmora@unix.SRI.COM (Matt Mora) (11/06/90)
In article <1774MAYER-A@RICEVM1> MAYER-A@RICEVM1.BITNET (David Mayer) writes: >I have not changed anything in the code except the size of the >rectangles that I store in the update region. Is there some secret to >smooth updates that I need to know?? You might want to try and set your rectangles sizes to some multiple of 8,16, or 32. This might help speed things up because the processor can move data around more efficently at even word boundries. Just a thought. If all else fails you can use offscreen buffers. >Any help would be appreciated. Thanks. > >David Mayer (MAYER-A@RICEVM1 Bitnet) -- ___________________________________________________________ Matthew Mora | my Mac Matt_Mora@sri.com SRI International | my unix mxmora@unix.sri.com ___________________________________________________________