Class ScalerContext

Hierarchy

ScalerContext
- ScalerContext

Index

Properties

canvas context fontName fontStyle size fauxBold fauxItalic fontBoundingBoxMap

Methods

setCanvas setContext isEmoji fontString getTextAdvance getTextBounds generateFontMetrics generateImage loadCanvas measureText

Constructors

Properties

`Static` canvas

canvas: HTMLCanvasElement | OffscreenCanvas

`Static` context

context: OffscreenCanvasRenderingContext2D | CanvasRenderingContext2D

`Private` `Readonly` fontName

fontName: string

`Private` `Readonly` fontStyle

fontStyle: string

`Private` `Readonly` size

size: number

`Private` `Readonly` fauxBold

fauxBold: boolean

`Private` `Readonly` fauxItalic

fauxItalic: boolean

`Private` fontBoundingBoxMap

fontBoundingBoxMap: {
key: string;
value: Rect;
}[] = []

Methods

`Static` setCanvas

setCanvas(canvas: HTMLCanvasElement | OffscreenCanvas): void
Parameters
- canvas: HTMLCanvasElement | OffscreenCanvas
Returns void
- Defined in src/core/scaler-context.ts:11

`Static` setContext

setContext(context: OffscreenCanvasRenderingContext2D | CanvasRenderingContext2D): void
Parameters
- context: OffscreenCanvasRenderingContext2D | CanvasRenderingContext2D
Returns void
- Defined in src/core/scaler-context.ts:15

`Static` isEmoji

isEmoji(text: string): boolean
Parameters
- text: string
Returns boolean
- Defined in src/core/scaler-context.ts:19

fontString

fontString(): string
Returns string
- Defined in src/core/scaler-context.ts:41

getTextAdvance

getTextAdvance(text: string): number
Parameters
- text: string
Returns number
- Defined in src/core/scaler-context.ts:60

getTextBounds

getTextBounds(text: string): Rect
Parameters
- text: string
Returns Rect
- Defined in src/core/scaler-context.ts:66

generateFontMetrics

generateFontMetrics(): {
    ascent: number;
    descent: number;
    xHeight: number;
    capHeight: number;
}
Returns {
    ascent: number;
    descent: number;
    xHeight: number;
    capHeight: number;
}
- ascent: number
- descent: number
- xHeight: number
- capHeight: number
- Defined in src/core/scaler-context.ts:80

generateImage

generateImage(text: string, bounds: Rect): HTMLCanvasElement | OffscreenCanvas
Parameters
- text: string
- bounds: Rect
Returns HTMLCanvasElement | OffscreenCanvas
- Defined in src/core/scaler-context.ts:95

`Protected` loadCanvas

loadCanvas(): void
Returns void
- Defined in src/core/scaler-context.ts:105

`Private` measureText

measureText(ctx: OffscreenCanvasRenderingContext2D | CanvasRenderingContext2D, text: string): TextMetrics
Parameters
- ctx: OffscreenCanvasRenderingContext2D | CanvasRenderingContext2D
- text: string
Returns TextMetrics
- Defined in src/core/scaler-context.ts:119

Constructors

constructor

new ScalerContext(fontName: string, fontStyle: string, size: number, fauxBold?: boolean, fauxItalic?: boolean): ScalerContext
Parameters
- fontName: string
- fontStyle: string
- size: number
- fauxBold: boolean = false
- fauxItalic: boolean = false
Returns ScalerContext
- Defined in src/core/scaler-context.ts:32

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