假设我有一个区域, 例如 200px 乘 100px 。 而不是在田里选择一个作物, 我希望田本身是作物面积, 我拖动图像而不是作物面积 。
"https://i.sstatic.net/hcKPV.jpg" alt="作物图像示例"/ >
所以您可以看到整张图像的边缘, 但是您只看到作物区域内的图像 。 您可以拖动图像周围, 并看到图像在其中的变化 。
假设我有一个区域, 例如 200px 乘 100px 。 而不是在田里选择一个作物, 我希望田本身是作物面积, 我拖动图像而不是作物面积 。
"https://i.sstatic.net/hcKPV.jpg" alt="作物图像示例"/ >
所以您可以看到整张图像的边缘, 但是您只看到作物区域内的图像 。 您可以拖动图像周围, 并看到图像在其中的变化 。
这里需要一个简单的小概念。 它需要一些精细的修改以确保您无法拖过界限( 如果您在红色边框的 div 上开始拖动它, 它并不适用封闭规则), 但这应该能提供概念的证明 。
http://jsfiddle.net/foxwisp/G7cEP/1/
基本上,您只需更新掩码框的位置,使其分离,然后更新背景图像位置,使其看起来移动。
如果你需要我进一步解释,请通知我
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