如何使Haskell Chart example1适用于Diagrams后端? [英] How to get Haskell Chart example1 working for Diagrams backend?

问题描述

Haskell图表库的示例输出看起来很棒.他们都使用我无法正确安装的Cairo后端，因此我想使用Diagrams后端尝试该库.

The example outputs for Haskell's chart library look great. They all use the Cairo backend which I cannot install properly, so I'd like to try out the library using the Diagrams backend.

但是，对我而言，如何执行此操作并不明显.特别是， def 是未定义的.

However, it is not obvious to me how to do this. In particular, def is undefined.

有人可以帮助我入门并向我展示如何修改源代码示例1 ，以便它可以在图表后端运行?

Can someone help me get started and show me how to modify the source code for example 1 so that it can run using the Diagrams backend?

推荐答案

有问题的 def 是开罗后端的 renderableToFile 的 FileOptions 参数.它具有默认实例.

The problematic def is the FileOptions argument to the Cairo backend's renderableToFile. This has a Default instance.

要使用图表后端进行渲染，请使用

To render with the Diagrams backend, replace the call to renderToFile with renderableToSVGFile from the Diagrams backend:

main = renderableToSVGFile chart 800 600 "example.svg"

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