Very slow drawing operation, Im trying to draw points on a grid
| ABlueEyedMonkey |
 Sep 13 2008, 05:01 PM
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 Advanced Member  Group: Members Posts: 31 Joined: 13-August 08 Member No.: 1176  |
Hi guys - im trying to draw points and lines on my control which is being used like a canvas grid. But the drawing operation is taking very long and it has totally slowed down the application. Here is how im drawing the points on the canvas - this was the slowest one.
CODE Rect view = context->getViewableBounds(); int width = view.getRight(); int height = view.getBottom(); if ( m_GridType == GRID_TYPE::GRID_POINTS ) { double pointSize = 2; for ( int x = 0; x < width; x += 10 ) // this size obviously changes the speed for ( int y = 0; y < height; y += 10 ) { context->rectangle( x - pointSize * 0.5f, y - pointSize * 0.5f, x + pointSize * 0.5f, y + pointSize * 0.5f ); context->fillPath(); } } What speed operations / limitations should I be aware of? because when i went into the code I could not see anything particularly slow... If you are curious what im trying to achieve - i am developing a diagramming solution (flowcharts etc) which when complete I will release for everyone to use. |
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Posts in this topic
ABlueEyedMonkey Very slow drawing operation Sep 13 2008, 05:01 PM
ABlueEyedMonkey Just as a quick aside - its drawing about 1500 rec... Sep 13 2008, 05:12 PM ddiego Try moving the fillPath()/strokePath outside of th... Sep 14 2008, 03:09 AM ABlueEyedMonkey Thanks ddiego, I already tried that and yes it sti... Sep 14 2008, 02:45 PM
ddiego Thanks for posting! I'll try and look into... Sep 15 2008, 01:28 PM ABlueEyedMonkey I havn't no - but i will give it a go and let ... Sep 15 2008, 02:07 PM ddiego Try updating to the latest code. I made a small ch... Sep 15 2008, 07:44 PM ABlueEyedMonkey Just as an aside - ive got to say that the drawing... Sep 15 2008, 04:22 PM ddiego
Thanks ! If you do like the way things are p... Sep 15 2008, 07:47 PM ABlueEyedMonkey Ok so i changed the code to work as was done in th... Sep 16 2008, 09:32 PM ddiego Here's my stats, running in Debug mode:
My mac... Sep 17 2008, 03:38 AM ABlueEyedMonkey Woah ok - so i added your code and this is what i ... Sep 17 2008, 01:13 PM ddiego
Can you try drawing using the GraphicsContext::r... Sep 18 2008, 02:04 AM ddiego Here's an alternate approach:
if ( m_G... Sep 20 2008, 03:22 AM ddiego If you update once more, I think I've fixed it... Sep 20 2008, 09:14 PM ABlueEyedMonkey Sure thing Jim :) Its a bit mental for me right no... Sep 21 2008, 04:18 PM ddiego
Not a problem! I'll miss by a few weeks... Sep 21 2008, 04:31 PM Fraggle Let us know what you think of our fair isle, eh?
... Sep 22 2008, 09:49 PM ABlueEyedMonkey Im actually still doing my course; as in Ive alrea... Sep 23 2008, 05:32 PM ABlueEyedMonkey Hey guys - ok ive done some reading and i think th... Sep 23 2008, 08:38 PM ddiego
OK that's insanely slow. Again, how are you ... Sep 23 2008, 09:25 PM   |
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