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Fix pinch to zoom
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Signed-off-by: Justin Georgi <justin.georgi@gmail.com>
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Justin Georgi
2024-09-25 20:04:59 -07:00
parent 8c2a135afb
commit 43ccf20561
1 changed files with 4 additions and 5 deletions
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9
src/pages/touch-mixin.js
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@@ -34,11 +34,10 @@ export default {
let newDistance = this.touchDistance(event.touches) let newDistance = this.touchDistance(event.touches)
let midX = (event.touches.item(0).clientX + event.touches.item(1).clientX) / 2 let midX = (event.touches.item(0).clientX + event.touches.item(1).clientX) / 2
let midY = (event.touches.item(0).clientY + event.touches.item(1).clientY) / 2 let midY = (event.touches.item(0).clientY + event.touches.item(1).clientY) / 2
let scale = newDistance / this.touchPrevious.distance let zoomFactor = newDistance / this.touchPrevious.distance
let scaleChange = this.canvasZoom * (scale - 1) this.canvasZoom *= zoomFactor
this.canvasZoom *= scale this.canvasOffset.x = (midX - 16) * (1 - zoomFactor) + this.canvasOffset.x * zoomFactor + (midX - this.touchPrevious.x)
this.canvasOffset.x += -((midX - 16) * scaleChange) + (midX - this.touchPrevious.x) this.canvasOffset.y = (midY - 96) * (1 - zoomFactor) + this.canvasOffset.y * zoomFactor + (midY - this.touchPrevious.y)
this.canvasOffset.y += -((midY - 96) * scaleChange) + (midY - this.touchPrevious.y)
this.touchPrevious = {distance: newDistance, x: midX, y: midY} this.touchPrevious = {distance: newDistance, x: midX, y: midY}
break; break;
} }