Introduction to Arcade

Jamie Z 2024-06-09

Learning Goals

• Learn to install and use arcade to create pictures and animations
• Understand how to loop a gradient background

Arcade

Arcade is a Python library for creating 2D video games. It is built on top of the Pyglet library and provides a simple, easy-to-use programming interface for creating games with 2D graphics.

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Coordinates

• We will be drawing in the upper right quadrant.
• 0, 0 will be the lower left of the screen, and all negative coordinates will be off-screen.
• Each ”point” will be a pixel – a window that is 800 pixels wide, will have the x- coordinate run from 0 to 800.

Setting up a Window

• In order to see what you have drawn it needs to be in a window and the code you are drawing needs to appear inside the render.

import arcade

arcade.open_window(600,600, "Drawing and Animation")

arcade.start_render()
# Draw stuff
arcade.finish_render()

arcade.run()

Gradients

Colour

• We can specify colours through arcade.csscolor and arcade.color
• We can also specify colours through a colour picker, using RGB value – red, green, blue value.

Code

import arcade
screen_width = 800
screen_height = 800
arcade.open_window(screen_width, screen_height,"Draw with Loops")
arcade.set_background_color((255, 255, 255))
arcade.start_render()
def draw_sky(bottom, b, screen_height, screen_width):
    arcade.draw_lrtb_rectangle_filled(0 ,screen_width, screen_height, bottom,(0,0,b))
#b = blue value, h = height of circle, w = width of circle
blue_value = 10
bottom_value = 60

# for i in range(number) means repeat something for (number) times.
for i in range(15):
    b = blue_value + i*20
    bottom = bottom_value + i*10 #bigger the value, bigger the rectangle 
    draw_sky(b, bottom, screen_height, screen_width)

arcade.finish_render()
arcade.run()