@tldraw/core

core

This package contains the core of the tldraw library. It includes:

• Renderer - a React component
• TLShapeUtility - an abstract class for custom shape utilities
• the library's TypeScript types
• several utility classes:
  • Utils
  • Vec
  • Svg
  • Intersect

Installation

yarn add @tldraw/core

Usage

Import the Renderer component and pass it the required props.

• Example
• Guide: Create a Custom Shape

Documentation

Renderer

• page - A TLPage object.
• pageState - A TLPageState object.
• shapeUtils - A table of TLShapeUtils classes.
• theme - (optional) an object with overrides for the Renderer's default colors.
  • foreground - The primary (usually "text") color
  • background - The default page's background color
  • brushFill - The fill color of the brush selection box
  • brushStroke - The stroke color of the brush selection box
  • selectFill - The fill color of the selection bounds
  • selectStroke - The stroke color of the selection bounds and handles

Tip: If providing an object for the theme prop, memoize it first with React.useMemo.

The renderer also accepts many (optional) event callbacks.

• 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
• onStopPointing - The user ended a point
• onPointShape - The user pointed a shape
• onDoublePointShape - 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
• onDoublePointHandle - The user double-pointed a shape handle
• onRightPointHandle- The 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
• onDoublePointCanvas - The user double-pointed the canvas
• onRightPointCanvas - The user right-pointed the canvas
• onPointBounds - The user pointed the selection bounds
• onDoublePointBounds - 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
• onDoublePointBoundsHandle - The user double-pointed a selection bounds edge or corner
• onBlurEditingShape - The user blurred an editing (text) shape
• onError - The renderer encountered an error

TLPage

An object describing the current page. It contains:

• id - a unique id for the page
• shapes - a table of TLShape objects
• bindings - a table of TLBinding objects
• backgroundColor - (optional) the page's background fill color

TLPageState

An object describing the current page. It contains:

• id - the corresponding page's id
• currentParentId: the current parent id for selection
• selectedIds: an array of selected shape ids
• camera : an object describing the camera state
  • point - the camera's [x, y] coordinates
  • zoom - the camera's zoom level
• brush: (optional) a Bounds for the current selection box
• pointedId: (optional) the currently pointed shape id
• hoveredId: (optional) the currently hovered shape id
• editingId: (optional) the currently editing shape id
• editingBindingId: (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.

• id: string
• type - the type of the shape, corresponding to the type of a TLShapeUtil.
• parentId - the id of the shape's parent (either the current page or another shape).
• childIndex - the order of the shape among its parent's children
• name - the name of the shape
• point - the shape's current [x, y] coordinates on the page
• rotation - the shape's current rotation in radians
• children - (optional) An array containing the ids of this shape's children
• handles - (optional) A table of TLHandle objects
• isLocked - (optional) True if the shape is locked
• isHidden - (optional) True if the shape is hidden
• isEditing - (optional) True if the shape is currently editing
• isGenerated- (optional) True if the shape is generated programatically
• isAspectRatioLocked - (optional) True if the shape's aspect ratio is locked

TLBinding

An object that describes a relationship between two shapes on the page.

• id - a unique id for the binding
• type - the binding's type
• fromId - the id of the shape where the binding begins
• toId - 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.

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

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.

Contribution

To contribute, visit the Discord channel.