56 lines
1.0 KiB
GDScript3
56 lines
1.0 KiB
GDScript3
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tool
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extends Reference
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func draw_line(x0 : int, y0 : int, x1 : int, y1 : int, image : Image, color : Color) -> void:
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image.lock()
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if abs(y1 - y0) < abs(x1 - x0):
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brenzenham_line_low(x0, y0, x1, y1, image, color)
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else:
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brenzenham_line_high(x0, y0, x1, y1, image, color)
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image.unlock()
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func brenzenham_line_low(x0 : int, y0 : int, x1 : int, y1 : int, image : Image, color : Color) -> void:
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var dx : int = x1 - x0
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var dy : int = y1 - y0
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var yi : int = 1
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if dy < 0:
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yi = - 1
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dy = - dy
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var D : int = 2 * dy - dx
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var y : int = y0
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for x in range(x0, x1):
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image.set_pixel(x, y, color)
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if D > 0:
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y = y + yi
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D = D - 2 * dx
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D = D + 2 * dy
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func brenzenham_line_high(x0 : int, y0 : int, x1 : int, y1 : int, image : Image, color : Color) -> void:
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var dx : int = x1 - x0
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var dy : int = y1 - y0
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var xi : int = 1
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if dx < 0:
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xi = -1
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dx = -dx
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var D : int = 2 * dx - dy
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var x : int = x0
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for y in range(y0, y1):
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image.set_pixel(x, y, color)
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if D > 0:
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x = x + xi
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D = D - 2 * dy
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D = D + 2 * dx
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