73 lines
2.6 KiB
Plaintext
73 lines
2.6 KiB
Plaintext
\ Bitmap width in pixels, height in pixels
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\ Return a group object with some lambda as members: SetPixel, GetPixel, Image$
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\ copyimage
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\ using Copy x, y Use Image$ we can display image$ to x, y as twips
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\ we can use x*twipsx, y*twipsy for x,y as pixels
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Function Bitmap (x as long, y as long) {
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if x<1 or y<1 then Error "Wrong dimensions"
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structure rgb {
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red as byte
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green as byte
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blue as byte
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}
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m=len(rgb)*x mod 4
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if m>0 then m=4-m ' add some bytes to raster line
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m+=len(rgb) *x
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Structure rasterline {
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{
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pad as byte*m
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}
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\\ union pad+hline
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hline as rgb*x
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}
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Structure Raster {
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magic as integer*4
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w as integer*4
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h as integer*4
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lines as rasterline*y
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}
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Buffer Clear Image1 as Raster
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\\ 24 chars as header to be used from bitmap render build in functions
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Return Image1, 0!magic:="cDIB", 0!w:=Hex$(x,2), 0!h:=Hex$(y, 2)
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\\ fill white (all 255)
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\\ Str$(string) convert to ascii, so we get all characters from words width to byte width
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Return Image1, 0!lines:=Str$(String$(chrcode$(255), Len(rasterline)*y))
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Buffer Clear Pad as Byte*4
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SetPixel=Lambda Image1, Pad,aLines=Len(Raster)-Len(Rasterline), blines=-Len(Rasterline) (x, y, c) ->{
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where=alines+3*x+blines*y
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if c>0 then c=color(c)
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c-!
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Return Pad, 0:=c as long
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Return Image1, 0!where:=Eval(Pad, 2) as byte, 0!where+1:=Eval(Pad, 1) as byte, 0!where+2:=Eval(Pad, 0) as byte
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}
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GetPixel=Lambda Image1,aLines=Len(Raster)-Len(Rasterline), blines=-Len(Rasterline) (x,y) ->{
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where=alines+3*x+blines*y
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=color(Eval(image1, where+2 as byte), Eval(image1, where+1 as byte), Eval(image1, where as byte))
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}
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StrDib$=Lambda$ Image1, Raster -> {
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=Eval$(Image1, 0, Len(Raster))
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}
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CopyImage=Lambda Image1 (image$) -> {
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if left$(image$,12)=Eval$(Image1, 0, 24 ) Then {
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Return Image1, 0:=Image$
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} Else Error "Can't Copy Image"
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}
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Group Bitmap {
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SetPixel=SetPixel
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GetPixel=GetPixel
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Image$=StrDib$
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Copy=CopyImage
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}
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=Bitmap
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}
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A=Bitmap(100,100)
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Call A.SetPixel(50,50, color(128,0,255))
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Print A.GetPixel(50,50)=color(128,0,255)
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\\ display image to screen at 100, 50 pixel
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copy 100*twipsx,50*twipsy use A.Image$()
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A1=Bitmap(100,100)
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Call A1.copy(A.Image$())
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copy 500*twipsx,50*twipsy use A1.Image$()
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