Texture Filled Triangle Function

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Andy_A	Created : 13 June 2011 Edited : 20 June 2011 System : Windows Language : Blitz Texture Filled Triangle Function Fill any triangle with any texture
The textures in the demo are... erm, f'ugly but!, you can use any texture you have on your hard drive ; Title: Textured Triangle Fill ;Programmer: Andy Amaya ; Date: 2011.06.12 AppTitle "Texture Filled Triangle Function" Global sw%, sh% sw = 640 : sh = 480 Graphics sw, sh, 32, 2 SeedRnd MilliSecs() ClsColor 32, 192, 255 ; these are procedurally generated textures but, ; you can use any texture you have on your hard drive img1% = makeTexture1() img2% = makeTexture2() img3% = makeTexture3() img4% = makeTexture4() ;to display the textures being used change to 1 showTextures = 0 While MouseHit(1) = 0 Cls If showTextures = 1 Then DrawBlock img1, 10,10 DrawBlock img2, 40,10 DrawBlock img3, 70,10 DrawBlock img4, 100,10 Color 0,0,0 Text 144,16,"<=== These are the textures used" End If st = MilliSecs() For i = 1 To 4 x1 = Rand(50,sw-50) : y1 = Rand(50,sh-50) x2 = Rand(50,sw-50) : y2 = Rand(50,sh-50) x3 = Rand(50,sw-50) : y3 = Rand(50,sh-50) Select i Case 1 textureFill(x1,y1,x2,y2,x3,y3,img1) Case 2 textureFill(x1,y1,x2,y2,x3,y3,img2) Case 3 textureFill(x1,y1,x2,y2,x3,y3,img3) Case 4 textureFill(x1,y1,x2,y2,x3,y3,img4) End Select Next et = MilliSecs()-st Color 0,0,0 Text 5, sh-20,"et: "+et Text sw/2, sh-20,"R-click to repeat L-click to exit",True Flip WaitMouse() ;L-click to exit ..... R-click to repeat Wend FreeImage img1 FreeImage img2 FreeImage img3 FreeImage img4 End Function textureFill(x1#, y1#, x2#, y2#, x3#, y3#, imageHandle%) Local slope1#, slope2#, slope3#, x#, y# Local imgW%, imgH%, tx%, sy%, ey%, ix%, iy%, vLen%, tLen% imgW = ImageWidth(imageHandle) imgH = ImageHeight(imageHandle) ;triangle coordinates must be ordered: where x1 < x2 < x3 If x2 < x1 Then x = x2 : y = y2 : x2 = x1 : y2 = y1 : x1 = x : y1 = y ;swap x1, y1, with x3, y3 If x3 < x1 Then x = x3 : y = y3 : x3 = x1 : y3 = y1 : x1 = x : y1 = y ;swap x2, y2 with x3, y3 If x3 < x2 Then x = x3 : y = y3 : x3 = x2 : y3 = y2 : x2 = x : y2 = y If x1 <> x3 Then slope1 = (y3-y1)/(x3-x1) ;draw the first half of the triangle length = x2 - x1 If length <> 0 Then slope2 = (y2-y1)/(x2-x1) For x = 0 To length ;add x to coord x1 tx = x+x1 ;find modulus of x coord on texture ix = tx Mod imgW ;calc the starting y pos sy = Int(xslope1+y1) ;calc the ending y pos ey = Int(xslope2+y1) ;make sure starting y pos is less than ending y pos If ey < sy Then tmp=sy: sy = ey: ey = tmp ;vLen (vertical length) is delta of starting y pos and ending y pos vLen = ey-sy ;while vertical length is non-zero add slices of texture (vLen = zero at vertex) While vLen > 0 ;find the modulus of starting y pos to grab a slice of texture image at correct position iy = sy Mod imgH ;tLen represents length of texture slice to grab tLen = imgH - iy ;if starting y pos plus texture length >= ending y pos of triangle then truncate tLen If (sy + tLen) >= ey Then tLen = ey-sy ;grab a 1 by tLen slice of the texture at ix, iy CopyRect ix, iy,1,tLen, tx, sy, ImageBuffer(imageHandle),BackBuffer() If tLen > 0 Then ;increment the starting y pos by adding texture slice length sy = sy + tLen ;subtract texture slice length from vertical length triangle section ;(this is how we eventually exit the While-Wend loop) vLen = vLen - tLen End If Wend Next End If ;draw the second half of the triangle y = lengthslope1+y1 : length = x3-x2 If length <> 0 Then slope3 = (y3-y2)/(x3-x2) For x = 0 To length ;add x to coord x2 tx = x+x2 ;find modulus of x coord on texture ix = tx Mod imgW ;calc the starting y pos sy = Int(xslope1+y) ;calc the ending y pos ey = Int(x*slope3+y2) ;make sure start y pos is less than ending y pos If ey < sy Then tmp=sy: sy = ey: ey = tmp ;vLen (vertical length) is delta of starting y pos and ending y pos vLen = ey-sy ;while vertical length is non-zero add slices of texture (vLen = zero at vertex) While vLen > 0 ;find the modulus of starting y pos to grab a slice of texture image at correct position iy = sy Mod imgH ;tLen represents length of texture slice to grab tLen = imgH - iy ;if starting y pos plus texture length >= ending y pos of triangle then truncate tLen If (sy + tLen) >= ey Then tLen = ey-sy ;grab a 1 by tLen slice of the texture at ix, iy CopyRect ix, iy,1,tLen, tx, sy, ImageBuffer(imageHandle),BackBuffer() If tLen > 0 Then ;increment the starting y pos by adding texture slice length sy = sy + tLen ;subtract texture slice length from vertical length triangle section ;(this is how we eventually exit the While-Wend loop) vLen = vLen - tLen End If Wend Next End If End Function Function makeTexture1() Local dh#, diam%, j#, i% texture% = CreateImage(24,24) SetBuffer(ImageBuffer(texture)) Color 0, 0, 128 Rect 0, 0, 24, 24, True dh = 256./23. diam = 24 j = 91.0 offset = 0 While j <= 224.0 i = Floor(j) Color i,i,i Oval 0+offset, 0+offset, diam, diam, True diam = diam - 2 offset = offset + 1 If diam < 1 Then diam = 1: offset = diam/2 j = j + dh Wend SetBuffer(BackBuffer()) Return texture End Function Function makeTexture2() texture% = CreateImage(21,21) SetBuffer(ImageBuffer(texture)) Color 128, 0, 0 Rect 0, 0, 21, 3, True Color 255,160,0 Rect 0, 3, 21, 3, True Color 255,255,0 Rect 0, 6, 21, 3, True Color 0,255,0 Rect 0, 9, 21, 3, True Color 0,0,255 Rect 0,12, 21, 3, True Color 128,0,255 Rect 0,15, 21, 3, True Color 0,0,128 Rect 0,18, 21, 3, True SetBuffer(BackBuffer()) Return texture End Function Function makeTexture3() Local dh#, diam%, j#, i% texture% = CreateImage(24,24) SetBuffer(ImageBuffer(texture)) Color 128, 0, 0 Rect 0, 0, 24, 24, True dh = 256./23. diam = 24 j = 91.0 offset = 0 While j <= 224.0 i = Floor(j) Color i,i,0 Oval 0+offset, 0+offset, diam, diam, True diam = diam - 2 offset = offset + 1 If diam < 1 Then diam = 1: offset = diam/2 j = j + dh Wend SetBuffer(BackBuffer()) Return texture End Function Function makeTexture4() texture% = CreateImage(42,24) SetBuffer(ImageBuffer(texture)) Color 0,80,112 Rect 0,0,42,28,True Color 255,255,32 Text 21, 0,"Blitz",True Text 21,11,"Plus",True SetBuffer(BackBuffer()) Return texture End Function --v

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Texture Filled Triangle Function

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