Different type of buttons and rotate
Blitz3D Forums/Blitz3D Programming/Different type of buttons and rotate
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| Graphics 800,600,16,2 SetBuffer BackBuffer() Color 255,0,255 Plot 0,0 LockBuffer() Global mask_color%=ReadPixelFast(0,0) UnlockBuffer() button_image=CreateImage(200,50) SetBuffer ImageBuffer(button_image) Color Rand(0,255),Rand(0,255),150 Rect 0,0,200,50 Color 255,0,255 Oval 10,10,180,30 SetBuffer BackBuffer() While KeyHit(1)=0 Cls x=200 y=200 DrawImage button_image,x,y overlapping=0 If MouseX()>x And MouseX()<x+200 And MouseY()>y And MouseY()<y+50 SetBuffer ImageBuffer(button_image) LockBuffer() If ReadPixelFast(MouseX()-x,MouseY()-y)<>mask_color Then overlapping=1 UnlockBuffer() SetBuffer BackBuffer() EndIf Color 255,255,255 If overlapping=1 Then Text 0,0,"overlapping" Flip Wend If i rotate the image with the RotateImage() -function, how can i check overlapping then? |
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| You could use the Command "ImagesCollide" to check if they are overlapping. You only have to use a little dummy image under the mousepointer, something like mous=createimage(1,1) MaskImage mous,255,255,255 To allow a button with a sensitive and an unsensitive zone you may need to use 2 button images layers, where one of them is holding the mask information only. Please note: rotating an image may be VERY slow. Here's an example. You'll also notice the shape of the button degenerates increasingly: Graphics 800,600,16,2 SetBuffer BackBuffer() Color 255,0,255 Plot 0,0 LockBuffer() Global mask_color%=ReadPixelFast(0,0) UnlockBuffer() TFormFilter 0 button_image=CreateImage(200,50) SetBuffer ImageBuffer(button_image) Color Rand(0,255),Rand(0,255),150 Rect 0,0,200,50 Color 255,0,255 Oval 10,10,180,30 button_image_masked=CopyImage(button_image) MaskImage button_image_masked, 255,0,255 mous=CreateImage(1,1) MaskImage mous, 255,255,255 SetBuffer BackBuffer() While KeyHit(1)=0 Cls a=(a +1) Mod 360 RotateImage button_image_masked, a RotateImage button_image, a x=200 y=200 mx=MouseX() my=MouseY() DrawImage button_image_masked,x,y DrawImage button_image,x,y DrawImage mous,mx,my overlapping=0 If ImagesCollide(mous,mx,my,0,button_image_masked,x,y,0) overlapping=1 EndIf Color 255,255,255 If overlapping=1 Then Text 0,0,"overlapping" VWait: Flip 0 Wend Here's the same code, only using a copy of the original button image for every rotation. This will not only prevent degeneration by stepwise rotation, it's also a lot faster for some reason: Graphics 800,600,16,2 SetBuffer BackBuffer() Color 255,0,255 Plot 0,0 LockBuffer() Global mask_color%=ReadPixelFast(0,0) UnlockBuffer() TFormFilter 0 button_image=CreateImage(200,50) SetBuffer ImageBuffer(button_image) Color Rand(0,255),Rand(0,255),150 Rect 0,0,200,50 Color 255,0,255 Oval 10,10,180,30 button_image_bk=CopyImage(button_image) button_image_masked=CopyImage(button_image) MaskImage button_image_masked, 255,0,255 button_image_masked_bk=CopyImage(button_image_masked) mous=CreateImage(1,1) MaskImage mous, 255,255,255 SetBuffer BackBuffer() While KeyHit(1)=0 Cls a=(a +1) Mod 360 FreeImage button_image_masked button_image_masked=CopyImage(button_image_masked_bk) FreeImage button_image button_image=CopyImage(button_image_bk) RotateImage button_image_masked, a RotateImage button_image, a x=200 y=200 mx=MouseX() my=MouseY() DrawImage button_image_masked,x,y DrawImage button_image,x,y DrawImage mous,mx,my overlapping=0 If ImagesCollide(mous,mx,my,0,button_image_masked,x,y,0) overlapping=1 EndIf Color 255,255,255 If overlapping=1 Then Text 0,0,"overlapping" VWait: Flip 0 Wend To get a bearable speed I'd suggest to stay away from realtime rotation and use precalculate rotated images instead. Or, much more elegant and ultrafast: use 3D quads and sprites to simulate 2D images. This way you can roatae, scale etc. thousands of "images" each frame. Tho it may tak some time to become familar with this "2D made of 3D" stuff. |
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| If you choose the 2d-in-3d route, you may well want to consider BlitzMax, as all that is done for you =] |
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