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Scratch's pen feature can be used to create line drawings, and it can also be used to fill the screen with a picture. This article will show some pen art examples, and their scripts, utilizing intrinsic information present within either the Scratch stage combined with other built-in mathematical formulas and operations.
Set Up
Follow the instructions on this page to create the basic pen drawing script. The only block that will be needed is this one:
set pen (color v) to (Equation or Source)
Color
Colors in Scratch are stored as numbers.
| Description | Image |
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This script draws a green screen using the pen:
set pen (color v) to (66) |
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To create a different outcome where the pen changes color as it moves vertically, use this script:
set pen (color v) to (x position) The script changes the color to whatever the x position of the pen is, which is also stored as a number. The colors form vertical stripes which is because all points in a vertical stripe have the same x position. |
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This script creates horizontal stripes:
set pen (color v) to (y position) |
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This script creates slanted stripes by adding the x position to the y position:
set pen (color v) to ((x position) + (y position)) |
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This script draws colored rings:
set pen (color v) to (distance to (origin v)) This method requires that there is a sprite named "origin" at the center of the screen, at x: 0, y: 0. An alternative method is to directly calculate the distance from the origin without a sprite: set pen (color v) to ([sqrt v] of (((x position) * (x position)) + ((y position) * (y position)))) |
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Adding Math
Scratch has many mathematical functions. Although some seem complicated, using them can produce many different results.
| Description | Image |
|---|---|
This script produces waves:
set pen (color v) to ((y position) + ((50) * ([sin v] of (x position)))) |
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The arctangent function (abbreviated "atan") can be used to make a color wheel:
set pen (color v) to (([atan v] of ((y position) / (x position))) / (0.9)) |
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This script mixes a color wheel with rings:
set pen (color v) to ((([atan v] of ((y position) / (x position))) / (0.9)) + (distance to (origin v))) |
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This script creates wavy rings:
set pen (color v) to ((([atan v] of ((y position) / (x position))) / (0.9)) + ((20)* ([sin v] of ((10) * (distance to (origin v)))))) |
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Examples
See more examples of pen art:
A drawing with a star in the middle, with more stars as borders.
A tile-like drawing.
A drawing with rounded square in each corner.
A drawing with rays pointing towards the middle.
