PyGameExamplesAndAnswers

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Mask

Create mask from Surface

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Mask collision

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  📁 Minimal example - Find intersection of surfaces

  repl.it/@Rabbid76/PyGame-SurfaceMaskIntersect

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  📁 Minimal example - Find intersection of surface and lines

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• Get the pixels which are colliding with the Surface

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  📁 Minimal example - Mask form a single color

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  📁 Minimal example - Mask collide point

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  📁 Minimal example - Keepn in mask with overlapping area

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  📁 Minimal example - Ellipse mask overlap

Mask count pixel

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  📁 Minimal example - Load image

Selection and highlighting

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  📁 Minimal example - Highlight object

  repl.it/@Rabbid76/PyGame-PyGame-HighlightObject

Circular mask

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Mask overlapping area

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  📁 Minimal example - Visualize overlapping area

Mask bounding area rectangle

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  Questions regarding the pygame.mask function
  

  📁 Minimal example - Find bounding area rectangle

  repl.it/@Rabbid76/ImageHitbox

pygame.Surface.get_rect.get_rect() returns a rectangle with the size of the Surface object. This function does not consider the drawing area in the image. If you want to find the bounding rectangle of the painted area in the surface, you need to create a mask.

pygame.mask.from_surface creates a pygame.mask.Mask object form a pygame.Surface.
A Surface is bitmap. A Mask is an 2 dimensional array with Boolean values. The Mask created is the size of the _Surface. A field is True if the corresponding pixel in the surface is not transparent, and False if it is transparent:

surf_mask = pygame.mask.from_surface(surf)

Get a list containing a bounding rectangles (sequence of pygame.Rect objects) for each connected component with get_bounding_rects.
pygame.mask.Mask.get_bounding_rects creates a list of pygame.Rect objects. Each rectangle describes a bounding area of connected pixles. If the Surface contains exactly 1 connected image, you will get exactly 1 rectangle surrounding the image:

rect_list = surf_mask.get_bounding_rects()

Create the union rectangle of the sequence of rectangles with unionall:

surf_mask_rect = rect_list[0].unionall(rect_list)

def getMaskRect(surf, top = 0, left = 0):
    surf_mask = pygame.mask.from_surface(surf)
    rect_list = surf_mask.get_bounding_rects()
    surf_mask_rect = rect_list[0].unionall(rect_list)
    surf_mask_rect.move_ip(top, left)
    return surf_mask_rect

Sprite mask

See Sprite, Group and Sprite mask - Sprite mask