pygame_5.2.py

import pygame
from pygame.locals import *
from sys import exit

pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 32)

color1 = (221, 99, 20)
color2 = (96, 130, 51)
factor = 0.


def blend_color(color1, color2, blend_factor):
    r1, g1, b1 = color1
    r2, g2, b2 = color2
    r = r1 + (r2 - r1) * blend_factor
    g = g1 + (g2 - g1) * blend_factor
    b = b1 + (b2 - b1) * blend_factor
    return int(r), int(g), int(b)


while True:

    for event in pygame.event.get():
        if event.type == QUIT:
            exit()

    screen.fill((255, 255, 255))

    tri = [(0, 120), (639, 100), (639, 140)]
    #pygame.draw.polygon(screen, (0, 255, 0), tri)
    #pygame.draw.circle(screen, (0, 0, 0), (int(factor * 639.0), 120), 10)

    x, y = pygame.mouse.get_pos()
    if pygame.mouse.get_pressed()[0]:
        factor = x / 639.0
        pygame.display.set_caption("Pygame Color Blend Test - %.3f" % factor)

    color = blend_color(color1, color2, factor)
    pygame.draw.rect(screen, color, (0, 240, 640, 240))

    pygame.display.update()