Javascript 纸张缩放和平移

我已经成功实现了基于的缩放功能

但是，当您缩小到原始的

scale=1

时，这并不考虑视图的位置。我的意思是，我想把视图粘贴到画布边缘

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这是一个屏幕截图，如果有人偶然发现这个问题，这里有答案。关键是检查视图的边界，然后进行相应调整：

    bounds = paper.view.bounds;

    if (bounds.x < 0) paper.view.center = paper.view.center.subtract(new Point(bounds.x, 0));
    if (bounds.y < 0) paper.view.center = paper.view.center.subtract(new Point(0, bounds.y));

    bounds = paper.view.bounds;
    var 
        w = bounds.x + bounds.width,
        h = bounds.y + bounds.height;

    if (w > paper.view.viewSize.width) paper.view.center = paper.view.center.subtract(new Point(w - paper.view.viewSize.width, 0));
    if (h > paper.view.viewSize.height) paper.view.center = paper.view.center.subtract(new Point(0, h - paper.view.viewSize.height));

bounds=paper.view.bounds；
如果（bounds.x<0）paper.view.center=paper.view.center.subtract（新点（bounds.x，0））；
如果（bounds.y<0）paper.view.center=paper.view.center.subtract（新点（0，bounds.y））；
边界=paper.view.bounds；
变量
w=bounds.x+bounds.width，
h=边界.y+边界.height；
如果（w>paper.view.viewSize.width）paper.view.center=paper.view.center.subtract（新点（w-paper.view.viewSize.width，0））；
如果（h>paper.view.viewSize.height）paper.view.center=paper.view.center.subtract（新点（0，h-paper.view.viewSize.height））；

为什么两次给边界赋值？

    bounds = paper.view.bounds;

    if (bounds.x < 0) paper.view.center = paper.view.center.subtract(new Point(bounds.x, 0));
    if (bounds.y < 0) paper.view.center = paper.view.center.subtract(new Point(0, bounds.y));

    bounds = paper.view.bounds;
    var 
        w = bounds.x + bounds.width,
        h = bounds.y + bounds.height;

    if (w > paper.view.viewSize.width) paper.view.center = paper.view.center.subtract(new Point(w - paper.view.viewSize.width, 0));
    if (h > paper.view.viewSize.height) paper.view.center = paper.view.center.subtract(new Point(0, h - paper.view.viewSize.height));