121 lines
2.4 KiB
Markdown
121 lines
2.4 KiB
Markdown
# PLOGO
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Purchase LOGO
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(currently named for my uni).
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A toy language.
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A kind of LOGO-like DSL built in the p5.js library.
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This is a rudimentary proof of concept right now with globals and without implementing classes. To write loops or *subroutines* one must use regular javascript.
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## How to Use
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Put your code inside the turtle function in turtle.js
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## Reference Commands
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### Movement
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```
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forward(n)
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```
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move n pixels ahead
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```
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back(n)
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```
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move n pixels back
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```
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left(Δ)
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```
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turns Δ degrees to the left
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```
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right(Δ)
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```
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turns Δ degrees to the right
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```
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setpos(x,y)
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```
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moves turtle to x,y pixel coordinate. 0,0 is top left of window.
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### Drawing
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```
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penup()
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```
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Going forward, Turtle will stop drawing a line with movement commands
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```
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pendown()
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```
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Turtle will start drawing lines tracing route. **By default, pendown is on / true**
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```
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penColor('colorName')
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```
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penColor takes any color word: purple, grey, blue, etc. **The color name must be in quotes.**
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Alternatively, a HTML color name, like #ff4d4d, may be specified in quotes. Example: ```penColor('#ff4d4d')```
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Alternatively, a RGB color or RGBA color with transparency can be specified, with *color*. Example: ```penColor(color(255,0,255))```. See transparency example in examples section below.
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```
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penSize(n)
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```
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Width of pen in pixels
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```
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retro()
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```
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Adds a retro filter on the entire drawing. This command can be called anywhere and filter is always applied at the end of the program.
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```
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noConsole()
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```
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Turns off the default onscreen display of the program listing.
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### Randomness
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```
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randint(n)
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```
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or
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```
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randint()
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```
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Returns a random int between 0 and n. Specifying a value is optional. If no input *n*, the default is between 0 and 100. Example: ```forward(randint(30))```
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## Examples
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See examples folder.
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### Updates
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##### 2021-02-14
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- Added onscreen console print of commands (on by default) and noConsole() to turn off
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- Added more example files
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##### 2021-02-07
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- Re-render turtle() after screen resizing
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- Added new setpos(x,y) function to move turtle to a position. A path will be drawn if the pen is currently down.
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- add retro() command for retro filter.
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