Module: ChunkyPNG::Canvas::Operations
- Included in:
- ChunkyPNG::Canvas
- Defined in:
- lib/chunky_png/canvas/operations.rb
Instance Method Summary collapse
- #compose(new_foreground, dx = 0, dy = 0) ⇒ Object
- #crop(x, y, crop_width, crop_height) ⇒ Object
- #replace(other, offset_x = 0, offset_y = 0) ⇒ Object
Instance Method Details
#compose(new_foreground, dx = 0, dy = 0) ⇒ Object
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# File 'lib/chunky_png/canvas/operations.rb', line 4 def compose(new_foreground, dx = 0, dy = 0) check_size_constraints!(new_foreground, dx, dy) for y in 0...new_foreground.height do for x in 0...new_foreground.width do self[x+dx, y+dy] = ChunkyPNG::Color.compose(new_foreground[x, y], self[x+dx, y+dy]) end end self end |
#crop(x, y, crop_width, crop_height) ⇒ Object
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# File 'lib/chunky_png/canvas/operations.rb', line 24 def crop(x, y, crop_width, crop_height) new_pixels = [] for cy in 0...crop_height do new_pixels += pixels.slice((cy + y) * width + x, crop_width) end ChunkyPNG::Canvas.new(crop_width, crop_height, new_pixels) end |
#replace(other, offset_x = 0, offset_y = 0) ⇒ Object
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# File 'lib/chunky_png/canvas/operations.rb', line 15 def replace(other, offset_x = 0, offset_y = 0) check_size_constraints!(other, offset_x, offset_y) for y in 0...other.height do pixels[(y + offset_y) * width + offset_x, other.width] = other.pixels[y * other.width, other.width] end self end |