Graphics.ScaleTransform 的替代方案

发布于 2024-12-09 22:22:35 字数 299 浏览 0 评论 0原文

我正在使用 GDI+ 进行自定义绘图。

通常，如果我想让我绘制的任何内容适合窗口，我会计算适当的比例，然后按该比例对所有内容进行 ScaleTransform：

e.Graphics.ScaleTransform(ratio, ratio);

ScaleTransform 的问题是它会缩放所有内容，包括笔划和画笔。

我要缩放我正在绘制的所有像素坐标吗？每条线、矩形或路径基本上都是一系列点。因此，我可以手动将所有这些点乘以比率，但是有没有一种简单的替代方法可以更无缝地完成此操作？

原文

I am doing custom drawing using the GDI+.

Normally if I want to fit whatever I am drawing to the window, I calculate the appropriate ratio and I ScaleTransform everything by that ratio:

e.Graphics.ScaleTransform(ratio, ratio);

The problem with ScaleTransform is that it scales everything including pen strokes and brushes.

Hoe do I scale all of the pixel coordinates of what I'm drawing? Every line, rectangle, or path is basically a series of points. So I can multiply all of those points by the ratio manually, but is there an easy alternative to do this more seamlessly?

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很酷又爱笑 2024-12-16 22:22:35

尝试将所有对象放入 GraphicsPath实例。它没有 ScaleTransform 方法，但您可以使用 GraphicsPath.Transform。您可以通过 Matrix.Scale。

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意犹 2024-12-16 22:22:35

您可以包装GDI图形对象并存储比例因子

interface IDrawing
{
   void Scale(float sx, float sy);
   void Translate(float dx, float dy);
   void SetPen(Color col, float thickness);
   void DrawLine(Point from, Point to);
   // ... more methods
}

class GdiPlusDrawing : IDrawing
{
   private float scale;
   private Graphics graphics;
   private Pen pen;

   public GdiPlusDrawing(Graphics g)
   {
      float scale = 1.0f;
   }

   public void Scale(float s)
   {
       scale *= s;
       graphics.ScaleTransform(s,s);
   }

   public void SetPen(Color color, float thickness)
   {
       // Use scale to compensate pen thickness.
       float penThickness = thickness/scale;
       pen = new Pen(color, penThickness);   // Note, need to dispose.
   }

   // Implement rest of IDrawing
}

You can wrap the GDI graphics object and store the scale factor

interface IDrawing
{
   void Scale(float sx, float sy);
   void Translate(float dx, float dy);
   void SetPen(Color col, float thickness);
   void DrawLine(Point from, Point to);
   // ... more methods
}

class GdiPlusDrawing : IDrawing
{
   private float scale;
   private Graphics graphics;
   private Pen pen;

   public GdiPlusDrawing(Graphics g)
   {
      float scale = 1.0f;
   }

   public void Scale(float s)
   {
       scale *= s;
       graphics.ScaleTransform(s,s);
   }

   public void SetPen(Color color, float thickness)
   {
       // Use scale to compensate pen thickness.
       float penThickness = thickness/scale;
       pen = new Pen(color, penThickness);   // Note, need to dispose.
   }

   // Implement rest of IDrawing
}

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