Graphics Component

Use Graphics when you need to draw custom vector shapes with PixiJS. For common primitive shapes, CanvasEngine also provides the Rect, Circle, Triangle, and Ellipse shortcuts.

Minimal example

<script>
const draw = (g) => {
  g.rect(0, 0, 100, 100).fill('red')
}
</script>

<Graphics draw />

Reactive redraw

<script>
import { signal } from 'canvasengine'

const width = signal(100)
const height = signal(100)

const draw = (g, width, height) => {
  g.rect(0, 0, width, height).fill('red')
}

const click = () => {
  width.update(w => w + 10)
  height.update(h => h + 10)
}
</script>

<Graphics draw click width height />

The drawing is redrawn when width or height changes.

Polygon Example

Polygon Example

Multiple polygons with different shapes, colors and styles to demonstrate polygon drawing capabilities

Preview

No console output

Shape shortcuts

Use these components when a primitive shape is enough and a custom draw function would add noise.

Rectangle

<Rect x={0} y={0} width={100} height={100} color="red" />

Circle

<Circle x={0} y={0} radius={50} color="red" />

Triangle

<Triangle x={0} y={0} width={100} height={100} color="red" />

Ellipse

<Ellipse x={0} y={0} width={100} height={100} color="red" />

draw

Function that draws on the canvas. It receives the Graphics object as argument. It uses PixiJS Graphics to draw.

Common Properties

Property	Type	Description
x	number	X-coordinate position of the display object.
y	number	Y-coordinate position of the display object.
width	number	Width of the display object.
height	number	Height of the display object.
scale	object	Scale of the display object.
anchor	object	Anchor point of the display object.
skew	object	Skew of the display object.
tint	number	Tint color of the display object.
rotation	number	Rotation of the display object in radians.
angle	number	Rotation of the display object in degrees.
zIndex	number	Z-index of the display object.
roundPixels	boolean	Whether to round pixel values.
cursor	string	Cursor style when hovering over the display object.
visible	boolean	Visibility of the display object.
alpha	number	Alpha transparency of the display object.
pivot	object	Pivot point of the display object.
filters	array	Filters applied to the display object.
maskOf	Element	Element that this display object masks.
blendMode	string	Blend mode for rendering.
filterArea	object	Filter area for rendering.
outline	object	Outline effect following the object's alpha contour.
clip	object	Rectangular mask used to keep or hide part of the object.
occlusion	object	Low-alpha redraw of the covered part when this object passes behind obstacles.

Layout Properties

Pour obtenir la documentation complète et détaillée sur toutes les propriétés de mise en page, consultez la documentation officielle de PixiJS Layout.

Sizing and Dimensions

Property	Type	Description
width	number/string	Width of the display object. Accepts pixels or percentage (e.g. '50%').
height	number/string	Height of the display object. Accepts pixels or percentage (e.g. '50%').
minWidth	number/string	Minimum width the object can shrink to.
minHeight	number/string	Minimum height the object can shrink to.
maxWidth	number/string	Maximum width the object can expand to.
maxHeight	number/string	Maximum height the object can expand to.
aspectRatio	number	Ratio between width and height (e.g. 1.5 for 3:2 ratio).

Flex Layout

Property	Type	Description
flexDirection	string	Direction of flex items. Values: 'row', 'column', 'row-reverse', 'column-reverse'.
flexWrap	string	Whether items wrap. Values: 'wrap', 'nowrap', 'wrap-reverse'.
justifyContent	string	Alignment along main axis. Values: 'flex-start', 'flex-end', 'center', 'space-between', 'space-around'.
alignItems	string	Alignment along cross axis. Values: 'flex-start', 'flex-end', 'center', 'stretch', 'baseline'.
alignContent	string	Alignment of lines with multiple items. Values: 'flex-start', 'flex-end', 'center', 'stretch', 'space-between', 'space-around'.
alignSelf	string	Override of parent's alignItems for specific item.
flexGrow	number	Grow factor of item relative to other items.
flexShrink	number	Shrink factor of item relative to other items.
flexBasis	number/string	Initial size of item before flex growing/shrinking.
gap	number/object	Gap between items.
rowGap	number	Gap between rows.
columnGap	number	Gap between columns.

Positioning

Property	Type	Description
positionType	string	Type of positioning. Values: 'relative', 'absolute', 'static'.
top	number/string	Distance from the top edge.
right	number/string	Distance from the right edge.
bottom	number/string	Distance from the bottom edge.
left	number/string	Distance from the left edge.

Spacing, Margins and Borders

Property	Type	Description
margin	number/array	Space outside border box. Can be single value or array for different sides.
padding	number/array	Space inside border box. Can be single value or array for different sides.
border	number/array	Border width. Can be single value or array for different sides.

Object Fitting and Alignment

Property	Type	Description
objectFit	string	How object is resized to fit layout box. Values: 'contain', 'cover', 'fill', 'none', 'scale-down'.
objectPosition	string	Anchor point of object inside layout box. E.g. 'center', 'top left'.
transformOrigin	string	Pivot point for rotation and scaling of layout box.

Shadow

Property	Type	Description
blur	number	Blur strength.
color	number	Color of the shadow.
offset	object	Offset of the shadow.
quality	number	Quality of the shadow.

Hook before destroy

<script>
  import {
    signal,
    animatedSignal,
    effect,
    animatedSequence,
  } from "canvasengine";
  import MyViewport from "./viewport.ce";
  
  let bool = signal(true)
  const opacity = animatedSignal(1, { duration: 500 });

  const click = async () => {
    bool.set(!bool())
  }

  const beforeDestroy = async () => {
    await animatedSequence([
      () => opacity.set(0),
    ])
    console.log("before destroy")
  }
</script>


<Canvas antialias={true}>
     <Container onBeforeDestroy={beforeDestroy}>
        @if (bool) {
            <Rect width={300} height={300} color="red" alpha={opacity} click />
        }
    </Container>
</Canvas>