What Does This Error Mean: TypeError: Argument 1 Must Be Pygame.Surface, Not Pygame.Rect

Here is my code, it is really simple: bif='C:\\Users\\Andrew\\Pictures\\pygame pictures\\Background(black big).png' import pygame, sys from pygame.locals import * pygame.init()

Solution 1:

The error means that it is expecting a surface not a rectangle. This is the offending line:

screen.blit(line,(mousex,mousey))

The problem is that you are assigning the result of draw.line() to line.

line=pygame.draw.line(background, (255,255,255), (30,31), (20,31))

From the pygame docs:

All the drawing functions respect the clip area for the Surface, and will be constrained to that area. The functions return a rectangle representing the bounding area of changed pixels.

So you are assigning a rectangle to line. Not sure exactly what you want to do, but you can draw the line following the mouse in the following way:

pygame.draw.line(background, (255,255,255), (x,y), (x,y+10))

Solution 2:

You use pygame.draw.line wrong. You seem under the impression this returns a new image with the line drawn on background. It doesn't. It will modify the background image.

So instead, you should

• create a new surface "line" with the required dimensions, and full transparency
• draw your line on that surface
• use this then, not the return-value of pygame.draw.line