可以使用PIL库来实现，先下载安装一下PIL(Python Imaging Library)库，然后运行下面代码：
# -*- coding: cp936 -*-
from PIL import Image, ImageDraw
im = Image.new('RGBA', (200,200) ) #建立一块200*200像素的画布（im）
draw = ImageDraw.Draw(im) #在画布上准备好“笔”（draw）
draw.arc((50, 50, 150, 150), 100,300, fill="#00ffff") #在画布上用“笔”画一段弧线
#(50, 50, 150, 150)是指这个圆在画布上左上角(50,50)右下角(150,150)的方框内；即是以（100,100）为圆心，50为半径的圆。
#100,300 表示这段弧是在上述圆的角度100度到300度之间
#fill="#00ffff" 表示设置的颜色
im.show() #将图像显示出来
im.save('1.png') #也可以将图像保存到指定路径
以上代码在python2.6环境中测试可用。
希望对你有所帮助~~~
>>fill = (200, 10, 10, 0.5)
对于RGBA模式的图片，填充半透明色，alpha位置取值是0-255，你希望50%，应该是用128，不是0。5
>>我这里画了一个比如三角形，准备再画一个三角形，也是半透明的，那么这两个颜色是可以混合起来的吧？
直接在同一个Image上绘图是不行的。后面画的会直接覆盖前面的，颜色不会自动融合。如果想要融合的效果，需要用Image.blend(im1, im2, 0.5)或者Image.composite(im1, im2, mask)其中mask需要带alpha参数，可以设置为128.
#!/usr/bin/env python2# coding=utf-8
"""
draw shapes and fill shap with transparent color and overlap them.
"""
from PIL import Image, ImageDraw
def main():
im = Image.new("RGBA", (800, 800))
draw = ImageDraw.Draw(im)
draw.rectangle((0, 0, 200, 200), fill=(255, 0, 0, 128))
draw.rectangle((400, 400, 600, 600), fill=(255, 0, 0))
im2 = Image.new("RGBA", (800, 800))
draw2 = ImageDraw.Draw(im2)
draw2.rectangle((100, 100, 300, 300), fill=(0, 255, 0, 128))
draw2.rectangle((500, 500, 700, 700), fill=(0, 255, 0))
# merge two images using blend
blend = Image.blend(im, im2, 0.5)
# drawf = ImageDraw.Draw(blend)
# drawf.rectangle((500, 100, 600, 200), fill=(255, 0, 0))
# drawf.rectangle((600, 200, 700, 300), fill=(0, 255, 0))
blend.save("/home/sylecn/d/blend.png")
# merge two images using composite
ones = Image.new("RGBA", (800, 800))
_draw = ImageDraw.Draw(ones)
_draw.rectangle((0, 0, 800, 800), fill=(255, 255, 255, 128))
final = Image.composite(im, im2, ones)
final.save("/home/sylecn/d/composite.png")
if __name__ == '__main__':
main()
from tkinter import *#2.获取到小圆移动的圆心坐标(x2, y2)
#3.把小圆从坐标(x1, y1)移动到坐标(x2, y2)
__author__ = {'name' : 'Hongten',
'mail' : '[email protected]',
'blog' : 'http://www.cnblogs.com/',
'QQ': '648719819',
'created' : '2013-09-20'}
class Eay(Frame):
def createWidgets(self):
## The playing field
self.draw = Canvas(self, width=500, height=500)
#鼠标位置
self.mouse_x = 450
self.mouse_y = 250
#圆心坐标(x,y)
self.oval_zero_x = 250
self.oval_zero_y = 250
#外面大圆半径
self.oval_r = 100
#里面小圆半径
self.oval_R = 30
self.oval_r1 = self.oval_r - self.oval_R + 0.5
self.oval_r2 = self.oval_r - self.oval_R - 0.5
#小圆
self.letter_ball_x1 = 250
self.letter_ball_y1 = 250
# The ball 外面大圆
self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r),
(self.oval_zero_y - self.oval_r),
(self.oval_zero_x + self.oval_r),
(self.oval_zero_y + self.oval_r),
fill="white")
self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r1),
(self.oval_zero_y - self.oval_r1),
(self.oval_zero_x + self.oval_r1),
(self.oval_zero_y + self.oval_r1),
fill="blue")
self.ball = self.draw.create_oval((self.oval_zero_x - self.oval_r2),
(self.oval_zero_y - self.oval_r2),
(self.oval_zero_x + self.oval_r2),
(self.oval_zero_y + self.oval_r2),
fill="white")
#里面小圆
self.ball_over = self.draw.create_oval((self.oval_zero_x - self.oval_R),
(self.oval_zero_y - self.oval_R),
(self.oval_zero_x + self.oval_R),
(self.oval_zero_y + self.oval_R),
fill="red")
self.draw.pack(side=LEFT)
def mouseMove(self, event):
self.mouse_x = event.x
self.mouse_y = event.y
if SHOW_LOG:
print('#' * 50)
print('鼠标的坐标为：({}, {})'.format(self.mouse_x, self.mouse_y))
print('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))
'''获取到小圆移动的圆心坐标(x2, y2)'''
ax_x = abs(self.mouse_x - self.oval_zero_x)
ax_y = abs(self.mouse_y - self.oval_zero_y)
if SHOW_LOG:
print('坐标A(oval_zero_x, oval_zero_y)到坐标X(mouse_x, mouse_y)的距离为AX')
print('AX中ax_x = {}, ax_y = {}'.format(ax_x, ax_y))
ax_len = ((ax_x ** 2) + (ax_y ** 2))**0.5
if SHOW_LOG:
print('AX的长度为：{}'.format(ax_len))
#如果鼠标坐标在(ax_len > |r-R|)
if ax_len > abs(self.oval_r - self.oval_R):
ac_len = abs(self.oval_r - self.oval_R)
if SHOW_LOG:
print('AC的产度为:{}'.format(ac_len))
if int(self.mouse_x - self.oval_zero_x) != 0:
if int(self.mouse_y - self.oval_zero_y) != 0:
#求直线斜率 y = kx + b
k = (self.mouse_y - self.oval_zero_y)/(self.mouse_x - self.oval_zero_x)
if SHOW_LOG:
print('鼠标到大圆圆心的直线的斜率为：{}'.format(k))
b = self.mouse_y - (k * self.mouse_x)
###################################################
#小圆移动后的坐标
#这里有三个条件：
# 1.小圆的圆心坐标(x1, y1)在直线AC上(y = kx + b)
# 2.(r-R)^2 = x1^2 + y1^2 由1,2可以得到 => (r-R)^2 = x1^2 + 2*x1*k*b + b^2 => x1有两个值，通过3判断x1的符号，从而求出y1
# 3.if self.mousex_x > 0:
# x1 > 0
#这是一个二元二次方程，方程的解有两组，不过通过鼠标的位置self.mouse_x(self.mouse_y)可以判断圆心坐标x1(y1)
letter_ball_x2 = ((ac_len * (abs(self.mouse_x - self.oval_zero_x)))/ax_len) + self.letter_ball_x1
letter_ball_y2 = (letter_ball_x2 * k) + b
if SHOW_LOG:
print('小圆当前坐标为：({}, {})'.format(self.letter_ball_x1, self.letter_ball_y1))
print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))
#把小圆从坐标(x1, y1)移动到坐标(x2, y2)
self.moved_x2 = letter_ball_x2 - self.letter_ball_x1
self.moved_y2 = letter_ball_y2 - self.letter_ball_y1
if SHOW_LOG:
print('需要移动的距离是：({}, {})'.format(int(self.moved_x2), int(self.moved_y2)))
self.draw.move(self.ball_over, int(self.moved_x2), int(self.moved_y2))
self.letter_ball_x1 = letter_ball_x2
self.letter_ball_y1 = letter_ball_y2
else:
print('鼠标在X轴上')
else:
print('鼠标在Y轴上')
else:
if SHOW_LOG:
print('小圆的移动后的坐标就是鼠标坐标')
#小圆移动后的坐标
letter_ball_x2 = self.mouse_x
letter_ball_y2 = self.mouse_y
if SHOW_LOG:
print('小圆移动后坐标为：({}, {})'.format(letter_ball_x2, letter_ball_y2))
#把小圆从坐标(x1, y1)移动到坐标(x2, y2)
self.moved_x2 = letter_ball_x2 - self.letter_ball_x1
self.moved_y2 = letter_ball_y2 - self.letter_ball_y1
if SHOW_LOG:
print('需要移动的距离是：({}, {})'.format(int(self.moved_x2), int(self.moved_y2)))
self.draw.move(self.ball_over, int(self.moved_x2), int(self.moved_y2))
self.letter_ball_x1 = letter_ball_x2
self.letter_ball_y1 = letter_ball_y2
def move_ball(self, *args):
#当鼠标在窗口中按下左键拖动的时候执行
Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
#当鼠标在大圆内移动的时候执行
#self.draw.tag_bind(self.ball, "<Any-Enter>", self.mouseMove)
def __init__(self, master=None):
global letter_ball_x2
letter_ball_x2 = 0
global letter_ball_y2
letter_ball_y2 = 0
global SHOW_LOG
SHOW_LOG = True
Frame.__init__(self, master)
Pack.config(self)
self.createWidgets()
self.after(10, self.move_ball)
game = Eay()
game.mainloop()
效果
![Map数据 转 byte [] 写入流中，然后在从流程读出来，转成Map格式，原本的Map格式以及数据不丢失。求解释](/aiimages/Map%E6%95%B0%E6%8D%AE+%E8%BD%AC+byte+%5B%5D+%E5%86%99%E5%85%A5%E6%B5%81%E4%B8%AD%EF%BC%8C%E7%84%B6%E5%90%8E%E5%9C%A8%E4%BB%8E%E6%B5%81%E7%A8%8B%E8%AF%BB%E5%87%BA%E6%9D%A5%EF%BC%8C%E8%BD%AC%E6%88%90Map%E6%A0%BC%E5%BC%8F%EF%BC%8C%E5%8E%9F%E6%9C%AC%E7%9A%84Map%E6%A0%BC%E5%BC%8F%E4%BB%A5%E5%8F%8A%E6%95%B0%E6%8D%AE%E4%B8%8D%E4%B8%A2%E5%A4%B1%E3%80%82%E6%B1%82%E8%A7%A3%E9%87%8A.png)
