Bitmap/Midpoint circle algorithm: Difference between revisions
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loop x y m |
loop x y m |
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;;</lang> |
;;</lang> |
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=={{header|Ruby}}== |
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<lang ruby>Pixel = Struct.new(:x, :y) |
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class Pixmap |
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def draw_circle(pixel, radius, colour) |
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validate_pixel(pixel.x, pixel.y) |
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self[pixel.x, pixel.y + radius] = colour |
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self[pixel.x, pixel.y - radius] = colour |
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self[pixel.x + radius, pixel.y] = colour |
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self[pixel.x - radius, pixel.y] = colour |
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f = 1 - radius |
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ddF_x = 1 |
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ddF_y = -2 * radius |
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x = 0 |
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y = radius |
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while x < y |
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if f >= 0 |
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y -= 1 |
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ddF_y += 2 |
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f += ddF_y |
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end |
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x += 1 |
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ddF_x += 2 |
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f += ddF_x |
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self[pixel.x + x, pixel.y + y] = colour |
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self[pixel.x + x, pixel.y - y] = colour |
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self[pixel.x - x, pixel.y + y] = colour |
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self[pixel.x - x, pixel.y - y] = colour |
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self[pixel.x + y, pixel.y + x] = colour |
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self[pixel.x + y, pixel.y - x] = colour |
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self[pixel.x - y, pixel.y + x] = colour |
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self[pixel.x - y, pixel.y - x] = colour |
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end |
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end |
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end |
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bitmap = Pixmap.new(30, 30) |
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bitmap.draw_circle(Pixel[14,14], 12, RGBColour::BLACK)</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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