[bmx] DrawImageRect like function by Dreamora [ 1+ years ago ]

[BlitzBot]

Title : DrawImageRect like function
Author : Dreamora
Posted : 1+ years ago

Description : This source is meant for an own file to import and not as stand alone code (will result in an error) that will compile this way (it would fail because of import but no framework)

Code :

Code (blitzmax) Select Expand

Rem
image: handle of the image you want to draw
x , y: Position at which you want to draw the imagerect
dw,dh: Drawing height and width of the image part you want do draw.
l,t: top left position on the image you want to start drawing (in pixels)
w,h: width and height of the imagerect you want to draw
End Rem

Function DrawImageArea(image:TImage, x#, y#, dw#, dh#, l#, t#, w#, h#, frame:Int=0)
Local origin_x#,origin_y#
GetOrigin (origin_x , origin_y)
Local tw = Pow2Size(image.width)
Local th = Pow2Size(image.height)
Local l1# = l + w
Local h1# = t + h
Local x0#=-image.handle_x
Local y0# = - image.handle_y

If l1 > image.width
'x1 = x0 + rw + image.width - l1
l1 = image.width
EndIf

If h1 > image.height
'y1 = y0 + rh + image.height - h1
h1 = image.height
EndIf

If TGLImageFrame (image.frame(frame))
Local frame:TGLImageFrame = TGLImageFrame (image.frame(frame))

frame.u0 = l / tw
frame.v0 = t / th
frame.u1 = l1 / tw
frame.v1 = h1 / th
frame.Draw x0,y0,x0+dw,y0+dh,x+origin_x,y+origin_y

frame.u0 = 0
frame.v0 = 0
frame.u1 = 1
frame.v1 = 1
Else
Local frame:TD3D7ImageFrame = TD3D7ImageFrame(image.frame(frame))
frame.setUV (l/tw, t/th, l1 / tw, h1 / th)
frame.Draw x0,y0,x0+dw,y0+dh,x+origin_x,y+origin_y
frame.setUV (0,0,1,1)
EndIf

Function Pow2Size(n)
Local ry = 1

While ry < n
ry :* 2
Wend

Return ry
End Function
End Function

Comments :


hub(Posted 1+ years ago)

 .


Dreamora(Posted 1+ years ago)

 Extended the code a little by adding the possibility to define the drawn imagearea width through dw and dh.By using negative h and w you can even flip your image rect.Corrected a bug with non-power of 2 textures. was spoted and corrected by GeoffTheGyratingGiraffe (BM internaly is not saving the real image size in VRAM but the size of the originally loaded, which is not the same for non-power of 2)


Yan(Posted 1+ years ago)

 I've just noticed that you're not resetting the UVs correctly.