As3 捏合缩放图片从手势保持比例来看

Question

我正在使用下面的代码来缩放 In/Out + 从手势点平移，非常适合 X/Y 一起缩放手势，但如果你只做 X 或只做 Y，它会丢失比例比例。

它只是一个 MC "largeImageContainer"，很容易在动画上复制 Touch 和 Gesture 上的问题。

任何帮助将不胜感激;)

import flash.events.TransformGestureEvent;
import flash.ui.Multitouch;
import flash.ui.MultitouchInputMode;
import fl.motion.MatrixTransformer;

Multitouch.inputMode = MultitouchInputMode.GESTURE;
stage.addEventListener(TransformGestureEvent.GESTURE_ZOOM, onZoom);
function onZoom(event: TransformGestureEvent): void {
    //trace(e.localX);
    var locX: Number = event.localX;
    var locY: Number = event.localY;
    var stX: Number = event.stageX;
    var stY: Number = event.stageY;
    var prevScaleX: Number = largeImageContainer.scaleX;
    var prevScaleY: Number = largeImageContainer.scaleY;
    var mat: Matrix;
    var externalPoint = new Point(stX, stY);
    var internalPoint = new Point(locX, locY);

    largeImageContainer.scaleX *= event.scaleX;
    largeImageContainer.scaleY *= event.scaleY;

    if (event.scaleX > 1 && largeImageContainer.scaleX > 6) {
        largeImageContainer.scaleX = prevScaleX;
        largeImageContainer.scaleY = prevScaleY;
    }

    if (event.scaleY > 1 && largeImageContainer.scaleY > 6) {
        largeImageContainer.scaleX = prevScaleX;
        largeImageContainer.scaleY = prevScaleY;
    }

    if (event.scaleX < 1.1 && largeImageContainer.scaleX < 1) {
        largeImageContainer.scaleX = prevScaleX;
        largeImageContainer.scaleY = prevScaleY;
    }

    if (event.scaleY < 1.1 && largeImageContainer.scaleY < 1) {
        largeImageContainer.scaleX = prevScaleX;
        largeImageContainer.scaleY = prevScaleY;

    }
    mat = largeImageContainer.transform.matrix.clone();
    MatrixTransformer.matchInternalPointWithExternal(mat, internalPoint, externalPoint);
    largeImageContainer.transform.matrix = mat;
}

largeImageContainer.addEventListener(MouseEvent.MOUSE_DOWN, f_begin);
largeImageContainer.addEventListener(MouseEvent.MOUSE_UP, f_end);
function f_begin(e: MouseEvent): void {
    largeImageContainer.startDrag();
}
function f_end(e: MouseEvent): void {
    largeImageContainer.stopDrag();
}

Answer 1

实际上这就是我想要的 ;) 保持比例，因为我更关注 Y 而不是 X。

largeImageContainer.scaleX *= event.scaleY;
largeImageContainer.scaleY *= event.scaleY;

As3 捏合缩放图片从手势保持比例来看

As3 Pinch Zoom picture from point of gesture keeping ratio

flash

actionscript-3