There are optional parameters for specifying the radius of the rectangle's border when calling the draw.rect() function. You can set the radius of the entire rectangle's border or a specific corner (top right, top left, bottom right, or bottom left). This allows you to round a part of your rectangle's border. The supported range is 0 to min(height, width) / 2, with 0 being an unrounded border.
```Python
pygame.draw.rect(surface, color, pygame.Rect(30, 30, 60, 60), width=0, border_radius=15) 
#this draws the roundest possible rectangle since it's min(height, width) / 2.
pygame.draw.rect(surface, color, pygame.Rect(30, 30, 60, 60), width=0, border_radius=0, border_bottom_right_radius=15) 
#this draws a rectangle that is unrounded on all corners except for the bottom right
```


University of Michigan - Ann Arbor

The draw.rect() function allows you to draw a rectangle. The function takes in the surface, color, rectangle object, and optional width. The width is used to determine line thickness or if the rectangle should be filled. When the width is 0, the rectangle will be filled. If it's greater than 0, it will determine the thickness of the line. If it's less than 0, nothing will be drawn.
```Python
displaySurface = pygame.display.set_mode((1920, 1080))
displayColor = (0, 0, 0)
rectangle = (400, 400, 50, 25) #this rectangle is 400 by 400 pixels and drawn on coordinates (50, 25)
width = 0
pygame.draw.rect(displaySurface, displayColor, rect, width)
```

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