喜笑颜开

此示例显示如何使用Arcade绘图命令。这是使用Arade可以做的最简单的事情之一，也是开始学习如何做图形的一个很好的方法。

有关如何使用Python Arade进行绘制的更详细分步操作，请参阅 How to Draw with Your Computer 。

有关如何操作的建议，请参阅：

• Draw a Picture

• Drawing with Functions

要查找所有可用命令，请在 API指数 。要查看其中一些命令的运行情况，请参见 绘图基本体 。

为简单起见，此示例没有许多通常在 使用窗口类启动模板 。

happy_face.py

"""
Drawing an example happy face

If Python and Arcade are installed, this example can be run from the command line with:
python -m arcade.examples.happy_face
"""

import arcade

# Set constants for the screen size
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 600
SCREEN_TITLE = "Happy Face Example"

# Open the window. Set the window title and dimensions
arcade.open_window(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)

# Set the background color
arcade.set_background_color(arcade.color.WHITE)

# Clear screen and start render process
arcade.start_render()

# --- Drawing Commands Will Go Here ---

# Draw the face
x = 300
y = 300
radius = 200
arcade.draw_circle_filled(x, y, radius, arcade.color.YELLOW)

# Draw the right eye
x = 370
y = 350
radius = 20
arcade.draw_circle_filled(x, y, radius, arcade.color.BLACK)

# Draw the left eye
x = 230
y = 350
radius = 20
arcade.draw_circle_filled(x, y, radius, arcade.color.BLACK)

# Draw the smile
x = 300
y = 280
width = 240
height = 200
start_angle = 190
end_angle = 350
line_width = 20
arcade.draw_arc_outline(x, y, width, height, arcade.color.BLACK,
                        start_angle, end_angle, line_width)

# Finish drawing and display the result
arcade.finish_render()

# Keep the window open until the user hits the 'close' button
arcade.run()