Difference between revisions of "ImageData:getPixel"
(Have API docs describe what the API does (instead of what it doesn't do, or what the author thinks the user ought to do).) |
(Updated for 11.0) |
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Valid x and y values start at 0 and go up to image width and height minus 1. Non-integer values are floored. | Valid x and y values start at 0 and go up to image width and height minus 1. Non-integer values are floored. | ||
+ | |||
+ | In versions prior to [[11.0]], color component values were within the range of 0 to 255 instead of 0 to 1. | ||
{{notice|Prior to [[0.10.2]], this function does not properly handle non-integer coordinates, and may produce an invalid result when non-integer values are passed.}} | {{notice|Prior to [[0.10.2]], this function does not properly handle non-integer coordinates, and may produce an invalid result when non-integer values are passed.}} | ||
== Function == | == Function == | ||
Line 12: | Line 14: | ||
{{param|number|y|The position of the pixel on the y-axis.}} | {{param|number|y|The position of the pixel on the y-axis.}} | ||
=== Returns === | === Returns === | ||
− | {{param|number|r|The red component (0- | + | {{param|number|r|The red component (0-1).}} |
− | {{param|number|g|The green component (0- | + | {{param|number|g|The green component (0-1).}} |
− | {{param|number|b|The blue component (0- | + | {{param|number|b|The blue component (0-1).}} |
− | {{param|number|a|The alpha component (0- | + | {{param|number|a|The alpha component (0-1).}} |
== Examples == | == Examples == |
Revision as of 20:28, 1 April 2018
Gets the color of a pixel at a specific position in the image.
Valid x and y values start at 0 and go up to image width and height minus 1. Non-integer values are floored.
In versions prior to 11.0, color component values were within the range of 0 to 255 instead of 0 to 1.
Prior to 0.10.2, this function does not properly handle non-integer coordinates, and may produce an invalid result when non-integer values are passed. |
Function
Synopsis
r, g, b, a = ImageData:getPixel( x, y )
Arguments
Returns
number r
- The red component (0-1).
number g
- The green component (0-1).
number b
- The blue component (0-1).
number a
- The alpha component (0-1).
Examples
Iterates over the pixels of an image and stores them in a sequence.
local image = love.image.newImageData( 'path/to/Image.png' )
local pixels = {}
for x = 1, image:getWidth() do
for y = 1, image:getHeight() do
-- Pixel coordinates range from 0 to image width - 1 / height - 1.
local pixel = image:getPixel( x - 1, y - 1 )
pixels[#pixels + 1] = pixel
end
end
return pixels
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