https://github.com/pengfeiw/mimiccadcanvas
The userControl which mimic cad canvas.Include zooming 、hightlighting and save screenshort into docx file.
https://github.com/pengfeiw/mimiccadcanvas
csharp graphics-programming winform
Last synced: 11 months ago
JSON representation
The userControl which mimic cad canvas.Include zooming 、hightlighting and save screenshort into docx file.
- Host: GitHub
- URL: https://github.com/pengfeiw/mimiccadcanvas
- Owner: pengfeiw
- Created: 2019-03-08T03:20:07.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2022-01-29T05:53:55.000Z (over 4 years ago)
- Last Synced: 2023-10-20T22:18:38.857Z (over 2 years ago)
- Topics: csharp, graphics-programming, winform
- Language: C#
- Size: 1.48 MB
- Stars: 4
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
The userControl which mimic cad canvas.Include zooming 、hightlighting and save screenshort into docx file.
# CoordTransform
首先，看一下 `CoordTransform` 类的原型，着重看一下它的成员变量的意思。
```csharp
public class CoordTransform
{
// 世界坐标系中一个单位长度与设备坐标系中一个单位长度的比值
private double m_WcsToDcs = 1.0;
// m_WcsToDcs 的倒数
private double m_DcsToWcs = 1.0;
// 设备坐标系的原点，在世界坐标系中的坐标
private PointF m_WndOrg = new PointF(); // Point which is mapped to window origin in world coordinate system
// 缩放上下限，缩放倍数最大不超过100，最小不超过 1 / 100
private double m_ZoomLimit = 100;
//public CoordTransform() { }
public void ViewAll(RectangleF bbox, RectangleF wndRect, int margin/*pixel*/){}
public bool Set(PointF wndOrg, double wcsToDcs){}
public void Pan(PointF lastPoint, PointF curPoint){}
public bool Zoom(Point mousePos, int delta){}
public void SetLimit(double limit){}
public PointF WcsToDcs(PointF point){}
public PointF DcsToWcs(PointF point){}
public double WlToDl(double len){}
public double DlToWl(double len){}
}
```
所有的图元坐标定义在世界坐标系中。
我们以一条线段 `(0,0)`, `(100, 100)` 为例，初始状态下 `m_WndOrg = (0, 0)`, `m_WcsToDcs = 1`。
## `m_WcsToDcs` 与 `m_DcsToWcs`
> 存储世界坐标系与设备坐标系之间的长度比例关系，这个可以用来控制缩放
当 `m_WcsToDcs = 2` 时，表示世界作标系的 1 个单位长度等于设备坐标系中 2 个单位长度。 此时如果没有发生平移，即 `m_WndOrg = (0, 0)`，那么线段的设备坐标就是`(0, 0)` 和 `(200, 200)`，此时我们看到的线段就是放大了 2 倍。
## `m_WndOrg`
> 存储世界坐标系与设备坐标系位置关系，这个可以用来控制平移
当 `m_WndOrg = (100, 100)` 时，表示设备坐标系的原点在世界坐标系中 `(100, 100)` 位置。此时如果没有发生缩放，即 `m_WcsToDcs = 1`, 那么线段的设备坐标就是`(-100, -100)` 和 `(0, 0)`。