python - 如何在pygame中用颜色填充我的图形？

Question

我有一个代码，它允许我在鼠标的帮助下绘制不同的曲线。我的任务是用颜色填充这条绘制的曲线。我确信曲线是闭合的。
我目前的代码:

import pygame as py
import sys

py.init()
White = (255,255,255)
Black = (0,0,0)
clock = py.time.Clock()
H = 400
W = 600
sc = py.display.set_mode((W,H))
sc.fill(White)
py.display.set_caption('Curve drawing')
py.display.update()
draw = False

while 1:
    for i in py.event.get():
        if i.type == py.QUIT:
            py.image.save(sc,r'C:/Users/Xiaomi' + '/temporary.png')
            py.quit()
            sys.exit()
        elif i.type == py.MOUSEBUTTONDOWN:
            if i.button == 1:
                draw = True
            elif i.button == 2:
                sc.fill(White)
                py.display.update()
        elif i.type == py.MOUSEBUTTONUP:
            if i.button == 1:
                draw = False
    if draw == True:
        py.draw.circle(sc,Black,i.pos,7)
        py.display.update()

谁能告诉我如何做到这一点？

Answer 1

您可以使用 PyGame 多边形绘制功能创建一个由所有鼠标点包围的填充区域。引用:https://www.pygame.org/docs/ref/draw.html#pygame.draw.polygon
因此，不要在每个点画一个圆，而是在鼠标移动时将鼠标位置添加到坐标列表中。释放按钮后，围绕所有这些点绘制一个填充的多边形。

fill_coords = []    # points to make filled polygon

while 1:
    for i in py.event.get():
        if i.type == py.QUIT:
            py.image.save(sc,r'C:/Users/Xiaomi' + '/temporary.png')
            py.quit()
            sys.exit()

        elif i.type == py.MOUSEBUTTONDOWN:
            if i.button == 1:
                draw = True
                fill_coords = []                              # restart the polygon
            elif i.button == 2:
                sc.fill(White)
                py.display.update()

        elif i.type == py.MOUSEBUTTONUP:
            if i.button == 1:
                draw = False
                pygame.draw.polygon( sc, Black, fill_coords ) # filled polygon

        elif i.type == pygame.MOUSEMOTION:                    # when the mouse moves
            if ( draw ):
                fill_coords.append( i.pos )                   # remember co-ordinate
    mouse_position = pygame.mouse.get_pos()
    if draw == True:
        py.draw.circle(sc,Black,i.pos,7)
        py.display.update()