Python学习笔记(4)Drawing on Canvas

最新推荐文章于 2025-05-22 13:45:07 发布

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最新推荐文章于 2025-05-22 13:45:07 发布 · 1.3w 阅读

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这篇Python学习笔记介绍了如何使用CodeSkulptor的简单GUI命令注册draw handler，并在大约每秒60次的频率下更新canvas。draw handler通过一系列如draw_text、draw_line和draw_circle等绘图命令在canvas上进行绘制。笔记中包含两个示例，展示了如何在canvas上显示文本和处理单一数值的转换。

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下面的笔记内容来自coursera上的Python公开课。

in CodeSkulptor, we're going to register the draw handler using a simpleGUI command that we’ll learn. And then, once we've registered it, CodeSkulptor calls the draw handler at around 60 times per second.

1 What does this draw handler do?

What the draw handler does, is the draw handler then updates the canvas, cause all of our drawings going to take place in CodeSkulptor, using a collection of draw commands. That include things like draw_text or draw_line, or something like draw_circle.

例1.1 first example of drawing on the canvas

import simplegui

# define draw handler 注意这里的参数canvas看上去好像从天而降一样，其实这是语法惯例
def draw(canvas):
    canvas.draw_text("Hello!",[100, 100], 24, "White")
    canvas.draw_circle([150, 150], 30,10 , "Red")

# create frame
frame = simplegui.create_frame("Text drawing", 300, 200)

# register draw