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Add rectangle resize methods, use in DragAndScale (#1057)

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2025-05-17 03:22:51 +10:00
committed by GitHub
parent 06413df706
commit d1ec780dbd
3 changed files with 210 additions and 139 deletions
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14
src/DragAndScale.ts
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@@ -92,7 +92,7 @@ export class DragAndScale {
}
computeVisibleArea(viewport: Rect | undefined): void {
const { scale, offset } = this
const { scale, offset, visible_area } = this
if (this.#stateHasChanged()) {
this.onChanged?.(scale, offset)
@@ -100,11 +100,10 @@ export class DragAndScale {
}
if (!this.element) {
this.visible_area[0] = this.visible_area[1] = this.visible_area[2] = this.visible_area[3] = 0
visible_area[0] = visible_area[1] = visible_area[2] = visible_area[3] = 0
return
}
let width = this.element.width
let height = this.element.height
let { width, height } = this.element
let startx = -offset[0]
let starty = -offset[1]
if (viewport) {
@@ -115,10 +114,9 @@ export class DragAndScale {
}
const endx = startx + width / scale
const endy = starty + height / scale
this.visible_area[0] = startx
this.visible_area[1] = starty
this.visible_area[2] = endx - startx
this.visible_area[3] = endy - starty
visible_area[0] = startx
visible_area[1] = starty
visible_area.resizeBottomRight(endx, endy)
}
toCanvasContext(ctx: CanvasRenderingContext2D): void {