如何在asp.net C＃中动态裁剪图像大小？

嗨成员，



我有一个颜色渐变图像设置为适合0到120的图表范围。但我现在的问题是我的问题图表范围可以根据填充的图表动态变化。



我的问题是如何在asp.net C＃中动态裁剪我的图像以裁剪想象一下图表吗？



目前默认的颜色渐变图像非常适合0到120的范围：

http://i.stack.imgur.com/Xlh8N.png [ ^ ]



但是让我们拿一个看看图像是静态的问题，并且不会相应地调整图表范围：

http ：//i.stack.imgur.com/1aVPc.png [ ^ ]



因此我想这样做：



1.获取图表的最大价值



2.例如如果值= 60，则％= 60/120 = 50％



3.从顶部动态裁剪50％并将其拉伸至100％以适合Y轴高度



我希望结果是：

http://i.stack.imgur.com/p8Bmt.png [ ^ ]

如果有任何其他方法来创建渐变色图像，请动态建议这样做！非常感谢。

Hi members,

I have a colour gradient image that is set to fit nicely on a chart range from 0 - 120. However my problem now is that my chart range can change dynamically according to the charts that is populated.

My question is how can I dynamically crop my image in asp.net C# to crop the image nicely to the chart?

Currently the default colour gradient image that fits nicely for range 0 - 120:
http://i.stack.imgur.com/Xlh8N.png[^]

However lets take a look at the problem which the image is static and does not adjust accordingly to the chart range:
http://i.stack.imgur.com/1aVPc.png[^]

Thus I would like to do in this approach:

1. get the max value of the chart

2. e.g. if value = 60, the % = 60/120 = 50%

3. dynamically crop 50% from the top and stretch it to 100% to fit the Y Axis height

which I would like the results to be:
http://i.stack.imgur.com/p8Bmt.png[^]
OR if there is any other approach to create gradient colour image like these dynamically do suggest too! thanks a lot.