###### tags: `Python`

# gold miner

一個早上的結果

import sys,time
import random

import pygame
from pygame. locals import QUIT

WINDOWS_WIDTH = 799
WINDOWS_HIGHT = 584
Gamer_coordinate = [385,80]
def main():
    pygame.init()
    screen = pygame.display.set_mode((WINDOWS_WIDTH,WINDOWS_HIGHT))
    pygame.display.set_caption("Gold miner")

    background = pygame.image.load("image/back.png").convert()
    player_gamer = pygame.image.load("image/clip.png").convert()
    screen.blit(background,[0, 0])

    angle = 0




    while True:
        pygame.display.flip()
        if angle < 90:
            angle += 1

        screen.blit(pygame.transform.rotate(player_gamer, angle), Gamer_coordinate)

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


        pygame.display.update()


if __name__ =='__main__':
    main()


# 設定鉤子旋轉遇到問題

在這個網頁找到了方法[點我](https://answerlib.com/question/47843/how-do-i-rotate-an-image-around-its-center-using-pygame.html)


用這個固定選轉點只讓它旋轉正負45度

## 固定旋轉軸在中心
> 其實是假固定中心點
> 每當圖片要旋轉時
> 會從新計算圖片左上角偏移位置
> 重新設置圖片的位置
> 讓他看起來像是圖片中心點被固定了一樣

def blitRotate(surf, image, pos, originPos, angle):
    # offset from pivot to center
    image_rect = image.get_rect(topleft=(pos[0] - originPos[0], pos[1] - originPos[1]))
    offset_center_to_pivot = pygame.math.Vector2(pos) - image_rect.center

    # roatated offset from pivot to center
    rotated_offset = offset_center_to_pivot.rotate(-angle)

    # roatetd image center
    rotated_image_center = (pos[0] - rotated_offset.x, pos[1] - rotated_offset.y)

    # get a rotated image
    rotated_image = pygame.transform.rotate(image, angle)
    rotated_image_rect = rotated_image.get_rect(center=rotated_image_center)

    # rotate and blit the image
    surf.blit(rotated_image, rotated_image_rect)