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Tldraw/packages/core/README.md

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# @tldraw/core
This package contains the core of the [tldraw](https://tldraw.com) library. It includes:
- [`Renderer`](#renderer) - a React component
- [`TLShapeUtility`](#tlshapeutility) - an abstract class for custom shape utilities
- the library's TypeScript [`types`](#types)
- several utility classes:
- [`Utils`](#utils)
- [`Vec`](#vec)
- [`Svg`](#svg)
- [`Intersect`](#intersect)
## Installation
```bash
yarn add @tldraw/core --peer
```
## Usage
Import the `Renderer` React component and pass it the required props.
- [Example](#example)
- [Guide: Create a Custom Shape](#create-a-custom-shape)
## Documentation
### `Renderer`
| Prop | Type | Description |
| ------------ | --------------------------------- | ---------------------------------------------------------------------- |
| `page` | [`TLPage`](#tlpage) | The current page object. |
| `pageState` | [`TLPageState`](#tlpagestate) | The current page's state. |
| `shapeUtils` | [`TLShapeUtils`](#tlshapeutils){} | The shape utilities used to render the shapes. |
| `theme` | `object` | (optional) an object with overrides for the Renderer's default colors. |
The theme object accepts valid CSS colors for the following properties:
| Property | Description |
| -------------- | --------------------------------------------------------------- |
| `foreground` | (optional) The primary (usually "text") color |
| `background` | (optional) The default page's background color |
| `brushFill` | (optional) The fill color of the brush selection box |
| `brushStroke` | (optional) The stroke color of the brush selection box |
| `selectFill` | (optional) The fill color of the selection bounds |
| `selectStroke` | (optional) The stroke color of the selection bounds and handles |
> Tip: If providing an object for the `theme` prop, either define the object outside of the parent component or memoize it with `React.useMemo`.
The renderer also accepts many (optional) event callbacks.
| Prop | Description |
| --------------------------- | --------------------------------------------------------- |
| `onPan` | The user panned with the mouse wheel |
| `onZoom` | The user zoomed with the mouse wheel |
| `onPinch` | The user moved their pointers during a pinch |
| `onPinchEnd` | The user stopped a two-pointer pinch |
| `onPinchStart` | The user began a two-pointer pinch |
| `onPointerMove` | The user moved their pointer |
| `onPointerUp` | The user ended a point |
| `onPointShape` | The user pointed a shape |
| `onDoubleClickShape` | The user double-pointed a shape |
| `onRightPointShape` | The user right-pointed a shape |
| `onMoveOverShape` | The user moved their pointer a shape |
| `onHoverShape` | The user moved their pointer onto a shape |
| `onUnhoverShape` | The user moved their pointer off of a shape |
| `onPointHandle` | The user pointed a shape handle |
| `onDoubleClickHandle` | The user double-pointed a shape handle |
| `onRightPointHandle`- | he user right-pointed a shape handle |
| `onMoveOverHandle` | The user moved their pointer over a shape handle |
| `onHoverHandle` | The user moved their pointer onto a shape handle |
| `onUnhoverHandle` | The user moved their pointer off of a shape handle |
| `onPointCanvas` | The user pointed the canvas |
| `onDoubleClickCanvas` | The user double-pointed the canvas |
| `onRightPointCanvas` | The user right-pointed the canvas |
| `onPointBounds` | The user pointed the selection bounds |
| `onDoubleClickBounds` | The user double-pointed the selection bounds |
| `onRightPointBounds` | The user right-pointed the selection bounds |
| `onPointBoundsHandle` | The user pointed a selection bounds edge or corner |
| `onDoubleClickBoundsHandle` | The user double-pointed a selection bounds edge or corner |
| `onBlurEditingShape` | The user blurred an editing (text) shape |
| `onError` | The renderer encountered an error |
> Tip: If providing callbacks, either define the functions outside of the parent component or memoize them first with `React.useMemo`.
### `TLPage`
An object describing the current page. It contains:
| Property | Type | Description |
| ----------------- | --------------------------- | --------------------------------------------------------------------------- |
| `id` | `string` | A unique id for the page. |
| `shapes` | [`TLShape{}`](#tlshape) | A table of shapes. |
| `bindings` | [`TLBinding{}`](#tlbinding) | A table of bindings. |
| `backgroundColor` | `string` | (optional) The page's background fill color. Will also overwrite the theme. |
### `TLPageState`
An object describing the current page. It contains:
| Property | Type | Description |
| ------------------ | ---------- | --------------------------------------------------- |
| `id` | `string` | The corresponding page's id |
| `selectedIds` | `string[]` | An array of selected shape ids |
| `camera` | `object` | An object describing the camera state |
| `camera.point` | `number[]` | The camera's `[x, y]` coordinates |
| `camera.zoom` | `number` | The camera's zoom level |
| `currentParentId` | `string` | (optional) The current parent id for selection |
| `brush` | `TLBounds` | (optional) A `Bounds` for the current selection box |
| `pointedId` | `string` | (optional) The currently pointed shape id |
| `hoveredId` | `string` | (optional) The currently hovered shape id |
| `editingId` | `string` | (optional) The currently editing shape id |
| `editingBindingId` | `string` | (optional) The currently editing binding id |
### `TLShape`
An object that describes a shape on the page. The shapes in your document should extend this interface with other properties. See [Guide: Create a Custom Shape](#create-a-custom-shape).
| Property | Type | Description |
| --------------------- | ------------------------- | -------------------------------------------------------------------------------------- |
| `id` | `string` | The shape's id. |
| `type` | `string` | The type of the shape, corresponding to the `type` of a [`TLShapeUtil`](#tlshapeutil). |
| `parentId` | `string` | The id of the shape's parent (either the current page or another shape). |
| `childIndex` | `number` | the order of the shape among its parent's children |
| `name` | `string` | the name of the shape |
| `point` | `number[]` | the shape's current `[x, y]` coordinates on the page |
| `rotation` | `number` | (optiona) The shape's current rotation in radians |
| `children` | `string[]` | (optional) An array containing the ids of this shape's children |
| `handles` | [`TLHandle{}`](#tlhandle) | (optional) A table of `TLHandle` objects |
| `isLocked` | `boolean` | (optional) True if the shape is locked |
| `isHidden` | `boolean` | (optional) True if the shape is hidden |
| `isEditing` | `boolean` | (optional) True if the shape is currently editing |
| `isGenerated` | `boolean` | optional) True if the shape is generated programatically |
| `isAspectRatioLocked` | `boolean` | (optional) True if the shape's aspect ratio is locked |
### `TLHandle`
An object that describes a relationship between two shapes on the page.
| Property | Type | Description |
| -------- | ---------- | ---------------------------------------------- |
| `id` | `string` | An id for the handle. |
| `index` | `number` | The handle's order within the shape's handles. |
| `point` | `number[]` | The handle's `[x, y]` coordinates. |
### `TLBinding`
An object that describes a relationship between two shapes on the page.
| Property | Type | Description |
| -------- | -------- | --------------------------------------------- |
| `id` | `string` | A unique id for the binding. |
| `type` | `string` | The binding's type. |
| `fromId` | `string` | The id of the shape where the binding begins. |
| `toId` | `string` | The id of the shape where the binding begins. |
### `TLShapeUtil`
The `TLShapeUtil` is an abstract class that you can extend to create utilities for your custom shapes. See [Guide: Create a Custom Shape](#create-a-custom-shape).
## `inputs`
A class instance that stores the current pointer position and pressed keys.
### `Utils`
A general purpose utility class.
### `Vec`
A utility class for vector math and related methods.
### `Svg`
A utility class for creating SVG path data through imperative commands.
### `Intersect`
A utility class for finding intersections between various geometric shapes.
## Guides
### Create a Custom Shape
...
### Example
```tsx
import * as React from "react"
import { Renderer, TLShape, TLShapeUtil, Vec } from '@tldraw/core'
interface RectangleShape extends TLShape {
type: "rectangle",
size: number[]
}
class Rectangle extends TLShapeUtil<RectangleShape> {
// See the "Create a Custom Shape" guide
}
const myShapes = { rectangle: new Rectangle() }
function App() {
const [page, setPage] = React.useState({
id: "page1"
shapes: {
"rect1": {
id: 'rect1',
parentId: 'page1',
name: 'Rectangle',
childIndex: 0,
type: 'rectangle',
point: [0, 0],
rotation: 0,
size: [100, 100],
}
},
bindings: {}
})
const [pageState, setPageState] = React.useState({
id: "page1",
selectedIds: [],
camera: {
point: [0,0],
zoom: 1
}
})
const handlePan = React.useCallback((delta: number[]) => {
setPageState(pageState => {
...pageState,
camera: {
zoom,
point: Vec.sub(pageState.point, Vec.div(delta, pageState.zoom)),
},
})
}, [])
return (<Renderer
shapes={myShapes}
page={page}
pageState={pageState}
onPan={handlePan}
/>)
}
```
## Development
Run `yarn` to install dependencies.
Run `yarn start` to begin the monorepo's development server (`@tldraw/site`).
Run `nx test core` to execute unit tests via [Jest](https://jestjs.io).
## Contribution
To contribute, visit the [Discord channel](https://discord.gg/s4FXZ6fppJ).
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