photoshop style zoom tool
Blitz3D Forums/Blitz3D Programming/photoshop style zoom tool
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| I'm doing a basic 2d paint app and have got stuck trying to figure how to make a zoom tool. I've been drawing the pixels on to a buffer as the user does the painting. Trouble is I can't see how I could take a chunk of the buffer and expand it to fill the window. Is there a way? Is it blindingly obvious and I'm just being a donkey's arse? |
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| There are a few in 3d, I'd do it using 2d in 3d and z-positioning, however, Thisd be slow as you would be relying on a texture. In pure 2D, i dont know, but i do know resizing images is dog-slow. |
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| hmmm. did a quick test at work and seems i can draw to the buffer, do "EntityTexture" and assign tex to a mesh and then view in 3D. All this in real time doesn't seem noticably slower than merely displaying in 2D and i can zoom in to my hearts content. Thanks for the hint Cygnus. |
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| Ahh yes, modify the buffer, and transfer it to a texture.. Thatl work and be nice n speedy! |
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| The way I've done it in the past in 2D, is to not actually display the buffer you're drawing on, but read the pixels and draw a solid rect (same colour as pixel) for each one. The size of the rects can vary according to zoom level. I guess this method might not be ideal if you have a large zoom window, and you're redrawing the entire screen every frame. |
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