pygame find a solution to stop pupil overflow outside Eye

Question

i try to create ellipse eye with pygame, and i have problem: my pupils overflow over eyes :

and I search to get this result

my code is like this :

self.lastrect = self.display.fill((0,0,0),self.lastrect)
leftEye = pygame.draw.ellipse(self.display, (255, 255, 255), [int(self.startx -self.startx/2-self.eyeRadius),int(self.starty-self.eyeRadius*self.eyeRatio), self.eyeWidth,self.eyeHeight], 0)
rightEye = pygame.draw.ellipse(self.display, (255, 255, 255), [int(self.startx +self.startx/2-self.eyeRadius),int(self.starty-self.eyeRadius*self.eyeRatio), self.eyeWidth,self.eyeHeight], 0)
leftPupil = self.display.blit(self.pupil,(self.x-self.startx/2-self.rad,self.y-self.rad))
rightPupil = self.display.blit(self.pupil,(self.x+self.startx/2-self.rad,self.y-self.rad))

pygame.display.update([leftPupil,leftEye,rightPupil,rightEye,self.lastrect])

can you help me to find a solution to stop pupil's overflow outside Eye ?

You might need to use a mask or BLEND_RGBA_MULT... see https://stackoverflow.com/questions/16880128/pygame-is-there-any-way-to-only-blit-or-update-in-a-mask — Richard Inglis, Apr 04 '18 at 23:35

score 0 · Answer 1 · answered Apr 05 '18 at 07:26

While there's no doubt that masks would be the better way, I would do something different (and dumber). In short is that I would give the screen a white backround, blit the pupil, AND THEN blit the face (in your picture it is the black background without the eye slots. This may sound confusing so think about creating the same exact image but with a white background.

However, there are a lot of negatives to this if you apply it to a program with other shapes and images so you'll want to probably stick with masking anyways. But this could work

score 0 · Accepted Answer · answered Apr 11 '18 at 11:15

I made it like this :

    mask = pygame.Surface(self.size, pygame.SRCALPHA)
    mask.fill((254, 195, 172))
    pygame.draw.ellipse(mask, (0, 0, 0), [
                        self.leftEllipseX, self.leftEllipseY, self.eyeWidth, self.eyeHeight], 0)
    pygame.draw.ellipse(mask, (0, 0, 0), [
                        self.rightEllipseX, self.rightEllipseY, self.eyeWidth, self.eyeHeight], 0)

    self.display.blit(mask, (0, 0), None, pygame.BLEND_RGB_MAX)

pygame find a solution to stop pupil overflow outside Eye

2 Answers2