WPF 中的 2D CAD 应用程序 [英] 2D CAD application in WPF

问题描述

我正在尝试在 WPF(.NET 4.0) 中编写一个类似 CAD 的应用程序，它需要能够显示大量的 2D 点/线.它将用于在鼠标悬停时通过缩放、平移、旋转和点捕捉来显示整个城市的 CAD 计划.

I'm trying to write an CAD-like application in WPF(.NET 4.0) that needs to be able to display a lot of 2D points/lines. It will be used to display CAD-plans of entire cities with zoom, pan, rotate and point snapping on mouseover.

现在我纯粹使用 WPF.我从 CAD 文件中读取对象，将它们绘制到 StreamGeometry 中，将其用作新路径的笔划并将其添加到 Canvas，并进行多次变换.

Right now I purely use WPF. I read the objects from the CAD file draw them into a StreamGeometry, use it as stroke of a new Path and add it to a Canvas, with several transforms.

我的问题是这个解决方案的扩展性不够好.它适用于小型 CAD 文件，但当我想显示半个城市(带有房屋和土地边界)时，它会非常非常延迟.

My problem is that this solution doesn't scale well enough. It works fine with small CAD-files, but when I want to display like half a city(with houses and land boundaries) it is very very delayed.

我也尝试将我的 CAD 文件转换为图像，但是- 32000x32000 的分辨率有时是不够的- 缩小时线条太细.

I also tried to convert my CAD-file to an image, but - a resolution a 32000x32000 is sometimes not enough - when zooming out the lines are too thin.

最后，我需要能够将它放在画布(2D/3D)上作为背景.

In the end I need to be able to place this on a Canvas(2D/3D) as background.

我在这里的最佳选择是什么?

What are my best options here?

谢谢，尼古拉斯

推荐答案

wpf 不适用于大型 3d 模型.恐怕太慢了.您最好的选择是直接 3d 或 openGL

wpf is not good for a large 3d models. im afraid it is too slow. Your best bet is direct 3d or openGL

但是，即使以 direct3d、openGL 的速度，如果您想展示整个城市，您仍然需要在渲染场景之前弄清楚如何剔除尽可能多的多边形/顶点.

However, even with the speed of direct3d,openGL you will still need to work out how to cull as many polygons/vertices as possible before the rendering of the scene if you are trying to show an entire city.

有大量关于这方面的信息(一般在游戏开发中)有几种技术，包括视锥体剔除、近、远平面剔除.

there is a large amount of information on this (generally under game development) there are a few techniques including frustrum culling, near and far plane culling.

此外，由于您可能有一个静态场景，因此您可以使用二进制空间分区.

also, since you probably have a static scene you may be able to use binary spacial partitioning.

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