Class DragAndScale

constructor

• new DragAndScale(element?, skipEvents?): DragAndScale

• Parameters

  • Optional element: HTMLCanvasElement
  • skipEvents: boolean = false

  Returns DragAndScale

dragging

element

enabled

last_mouse

max_scale

min_scale

offset

onredraw

scale

viewport

visible_area

bindEvents

• bindEvents(element): void

• Parameters

  • element: HTMLCanvasElement

  Returns void

changeDeltaScale

• changeDeltaScale(value, zooming_center?): void

• Parameters

  • value: number
  • Optional zooming_center: Vector2

  Returns void

changeScale

• changeScale(value, zooming_center?): void

• Parameters

  • value: number
  • Optional zooming_center: Vector2

  Returns void

computeVisibleArea

• computeVisibleArea(viewport?): void

• Parameters

  • Optional viewport: null | Vector4

  Returns void

convertCanvasToOffset

• convertCanvasToOffset(pos, out?): Vector2

• Parameters

  • pos: Vector2
  • out: Vector2 = ...

  Returns Vector2

convertOffsetToCanvas

• convertOffsetToCanvas(pos): Vector2

• Parameters

  • pos: Vector2

  Returns Vector2

mouseDrag

• mouseDrag(x, y): void

• Parameters

  • x: number
  • y: number

  Returns void

onMouse

• onMouse(_e): boolean

• Parameters

  • _e: MouseEvent

  Returns boolean

reset

• reset(): void

• Returns void

toCanvasContext

• toCanvasContext(ctx): void

• Parameters

  • ctx: CanvasRenderingContext2D

  Returns void