68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
# Doodad Scripting Engine
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Some ideas for the scripting engine for Doodads inside your level.
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# Architecture
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The script will be an "attached file" in the Doodad format as a special file
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named "index.js" as the entry point.
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Each Doodad will have its `index.js` script loaded into an isolated JS
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environment where it can't access any data about other Doodads or anything
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user specific. The `main()` function is called so the Doodad script can
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set itself up.
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The `main()` function should:
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* Initialize any state variables the Doodad wants to use in its script.
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* Subscribe to callback events that the Doodad is interested in catching.
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The script interacts with the Doodle application through an API broker object
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(a Go surface area of functions).
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# API Broker Interface
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```go
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type API interface {
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// "Self" functions.
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SetFrame(frame int) // Set the currently visible frame in this Doodad.
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MoveTo(render.Point)
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// Game functions.k
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EndLevel() // Exit the current level with a victory
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FailLevel(message)
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/************************************
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* Event Handler Callback Functions *
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************************************/
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// When we become visible on screen or disappear off the screen.
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OnVisible()
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OnHidden()
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// OnEnter: the other Doodad has ENTIRELY entered our box. Or if the other
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// doodad is bigger, they have ENTIRELY enveloped ours.
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OnEnter(func(other Doodad))
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// OnCollide: when we bump into another Doodad.
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OnCollide(func(other Doodad))
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}
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```
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## Mockup Script
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```javascript
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function main() {
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console.log("hello world");
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// Register event callbacks.
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Doodle.OnEnter(onEnter);
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}
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// onEnter: handle when another Doodad (like the player) completely enters
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// the bounding box of our Doodad. Example: a level exit.
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function onEnter(other) {
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}
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```
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