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Image: Line,Ellipse,Circle antialiased (with thickness) methods
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,6 @@ | ||
| procedure PixelProc(const X, Y: Integer; const Alpha: Byte); inline; | ||
| begin | ||
| if (X >= 0) and (Y >= 0) and (X < FWidth) and (Y < FHeight) then | ||
| FData[Y*FWidth+X].A := 0; | ||
| end; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // https://zingl.github.io/bresenham.js | ||
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| procedure DrawEllipseAA(x0, y0, x1, y1: Integer; Thickness: Single); | ||
| var | ||
| a,b,b1: Integer; | ||
| a2,b2: Single; | ||
| dx,dy: Single; | ||
| err: Single; | ||
| dx2,dy2,e2,ed: Single; | ||
| i: Single; | ||
| Alpha: Byte; | ||
| begin | ||
| a := Abs(x1 - x0); | ||
| b := Abs(y1 - y0); | ||
| b1 := b and 1; | ||
| a2 := a-2*Thickness; | ||
| b2 := b-2*Thickness; | ||
| dx := 4*(a-1)*b*b; | ||
| dy := 4*(b1-1)*a*a; | ||
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| i := a+b2; | ||
| err := b1*a*a; | ||
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| if ((Thickness-1) * (2*b-Thickness) > a*a) then | ||
| b2 := Sqrt(a*(b-a)*i*a2) / (a-Thickness); | ||
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| if ((Thickness-1) * (2*a-Thickness) > b*b) then | ||
| begin | ||
| a2 := Sqrt(b*(a-b)*i*b2) / (b-Thickness); | ||
| Thickness := (a-a2) / 2; | ||
| end; | ||
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| if (a = 0) or (b = 0) then | ||
| Exit; | ||
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| if (x0 > x1) then | ||
| begin | ||
| x0 := x1; | ||
| x1 += a; | ||
| end; | ||
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| if (y0 > y1) then | ||
| y0 := y1; | ||
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| if (b2 <= 0) then | ||
| Thickness := a; | ||
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| e2 := Thickness - Floor(Thickness); | ||
| Thickness := x0+Thickness-e2; | ||
| dx2 := 4*(a2+2*e2-1)*b2*b2; | ||
| dy2 := 4*(b1-1)*a2*a2; | ||
| e2 := dx2*e2; | ||
| y0 += (b+1) shr 1; | ||
| y1 := y0-b1; | ||
| a := 8*a*a; | ||
| b1 := 8*b*b; | ||
| a2 := 8*a2*a2; | ||
| b2 := 8*b2*b2; | ||
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| repeat | ||
| while True do | ||
| begin | ||
| if (err < 0) or (x0 > x1) then | ||
| begin | ||
| i := x0; | ||
| Break; | ||
| end; | ||
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| i := Min(dx,dy); | ||
| ed := Max(dx,dy); | ||
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| if ((y0 = y1+1) and (2*err > dx) and (a > b1)) then | ||
| ed := a/4 | ||
| else | ||
| ed += 2*ed*i*i/(4*ed*ed+i*i+1)+1; | ||
| i := 255*err/ed; | ||
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| Alpha := Byte(Round(i)); | ||
| PixelProc(x0,y0, Alpha); | ||
| PixelProc(x0,y1, Alpha); | ||
| PixelProc(x1,y0, Alpha); | ||
| PixelProc(x1,y1, Alpha); | ||
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| if (err+dy+a < dx) then | ||
| begin | ||
| i := x0+1; | ||
| Break; | ||
| end; | ||
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| x0 += 1; | ||
| x1 -= 1; | ||
| err -= dx; | ||
| dx -= b1; | ||
| end; | ||
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| while (i < Thickness) and (2*i <= x0+x1) do | ||
| begin | ||
| PixelProc(Round(i), y0, 0); | ||
| PixelProc(Round(x0+x1-i), y0, 0); | ||
| PixelProc(Round(i), y1, 0); | ||
| PixelProc(Round(x0+x1-i), y1, 0); | ||
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| i += 1.0; | ||
| end; | ||
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| while ((e2 > 0) and (x0+x1 >= 2*Thickness)) do | ||
| begin | ||
| i := Min(dx2,dy2); | ||
| ed := Max(dx2,dy2); | ||
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| if (y0 = y1+1) and (2*e2 > dx2) and (a2 > b2) then | ||
| ed := a2/4 | ||
| else | ||
| ed += 2*ed*i*i/(4*ed*ed+i*i); | ||
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| Alpha := Byte(Round(255-255*e2/ed)); | ||
| PixelProc(Round(Thickness), y0, Alpha); | ||
| PixelProc(Round(x0+x1-Thickness), y0, Alpha); | ||
| PixelProc(Round(Thickness), y1, Alpha); | ||
| PixelProc(Round(x0+x1-Thickness), y1, Alpha); | ||
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| if (e2+dy2+a2 < dx2) then | ||
| Break; | ||
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| Thickness += 1; | ||
| e2 -= dx2; | ||
| dx2 -= b2; | ||
| end; | ||
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| dy2 += a2; | ||
| e2 += dy2; | ||
| y0 += 1; | ||
| y1 -= 1; | ||
| dy += a; | ||
| err += dy; | ||
| until (x0 >= x1); | ||
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| while (y0-y1 <= b) do | ||
| begin | ||
| Alpha := Byte(Round(255*4*err/b1)); | ||
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| PixelProc(x0, y0, Alpha); | ||
| PixelProc(x1, y0, Alpha); | ||
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| y0 += 1; | ||
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| PixelProc(x0, y1, Alpha); | ||
| PixelProc(x1, y1, Alpha); | ||
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| y1 -= 1; | ||
| dy += a; | ||
| err += dy; | ||
| end; | ||
| end; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| // https://zingl.github.io/bresenham.js | ||
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| procedure DrawLineAA(x0, y0, x1, y1: Integer; Thickness: Single); | ||
| var | ||
| dx, dy, err: Integer; | ||
| e2, x2, y2: Integer; | ||
| ed: Single; | ||
| sx, sy: Integer; | ||
| begin | ||
| dx := Abs(x1 - x0); | ||
| dy := Abs(y1 - y0); | ||
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| if (x0 < x1) then sx := 1 else sx := -1; | ||
| if (y0 < y1) then sy := 1 else sy := -1; | ||
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| err := dx-dy; | ||
| if (dx+dy = 0) then | ||
| ed := 1 | ||
| else | ||
| ed := Sqrt(Double(dx*dx) + Double(dy*dy)); | ||
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| Thickness := (Thickness + 1) / 2; | ||
| while True do | ||
| begin | ||
| PixelProc(x0, y0, Round(Max(0, 255 * (Abs(err-dx+dy)/ed-Thickness+1)))); | ||
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| e2 := err; | ||
| x2 := x0; | ||
| if (2*e2 >= -dx) then | ||
| begin | ||
| e2 += dy; | ||
| y2 := y0; | ||
| while (e2 < ed*Thickness) and ((y1 <> y2) or (dx > dy)) do | ||
| begin | ||
| y2 += sy; | ||
| PixelProc(x0, y2, Round(Max(0, 255 * (Abs(e2)/ed-Thickness+1)))); | ||
| e2 += dx; | ||
| end; | ||
| if (x0 = x1) then | ||
| Break; | ||
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| e2 := err; | ||
| err -= dy; | ||
| x0 += sx; | ||
| end; | ||
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| if (2*e2 <= dy) then | ||
| begin | ||
| e2 := dx-e2; | ||
| while (e2 < ed*Thickness) and ((x1 <> x2) or (dx < dy)) do | ||
| begin | ||
| x2 += sx; | ||
| PixelProc(x2, y0, Round(Max(0, 255 * (Abs(e2)/ed-Thickness+1)))); | ||
| e2 += dy; | ||
| end; | ||
| if (y0 = y1) then | ||
| Break; | ||
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| err += dx; | ||
| y0 += sy; | ||
| end; | ||
| end; | ||
| end; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| procedure PixelProc(const X, Y: Integer; const Alpha: Byte); inline; | ||
| var | ||
| Pixel: PColorBGRA; | ||
| APlus1, APlus1Inv: UInt32; | ||
| begin | ||
| if (X >= 0) and (Y >= 0) and (X < FWidth) and (Y < FHeight) then | ||
| begin | ||
| Pixel := @FData[Y*FWidth+X]; | ||
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| if (Alpha > 0) then | ||
| begin | ||
| if (Pixel^.A > 0) then // dont blend again | ||
| Exit; | ||
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| APlus1 := Alpha + 1; | ||
| APlus1Inv := 255 - Alpha + 1; | ||
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| Pixel^.R := (BGRA.R * APlus1Inv) shr 8 + Pixel^.R * APlus1 shr 8; | ||
| Pixel^.G := (BGRA.G * APlus1Inv) shr 8 + Pixel^.G * APlus1 shr 8; | ||
| Pixel^.B := (BGRA.B * APlus1Inv) shr 8 + Pixel^.B * APlus1 shr 8; | ||
| Pixel^.A := Alpha; | ||
| end else | ||
| Pixel^ := BGRA; | ||
| end; | ||
| end; | ||
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