在Windows窗体中高效地绘制网格 [英] Efficiently draw a grid in Windows Forms

问题描述

我正在用C＃写一篇康威的生命游戏的实现。这是我用来绘制网格的代码，它在我的panel_Paint事件中。 g是图形上下文。

  for（int y = 0; y< numOfCells * cellSize; y + = cellSize）$ （p，x，0，x，y + b）的b $ b {
 numOfCells * cellSize）; 
 g.DrawLine（p，0，x，y + size * drawnGrid，x）; 
 
 
 $ / code> 

当我运行我的程序时，它直到它没有响应完成绘制网格，在numOfCells = 100& cellSize = 10。删除所有乘法使得它更快，但不是很多。

是否有更好/更有效的绘制网格的方法？

谢谢

解决方案

问题在于你为每个Y绘制X行坐标。您可以先简化一个循环中的Y行，然后再循环另一个循环中的X行。

这里有一个简单的例子：

  for（int y = 0; y  {
 g.DrawLine（p，0，y * cellSize，numOfCells * cellSize，y * cellSize）; 
 
 
 for（int x = 0; x  {
 g.DrawLine（p，x * cellSize，0， x * cellSize，numOfCells * cellSize）; 
} 
  

随着您的进步，您可以使用双缓冲来减少闪烁等。看看Control.SetStyle< br />
http：// msdn.microsoft.com/en-us/library/system.windows.forms.control.setstyle.aspx

I'm writing an implementation of Conway's Game of Life in C#. This is the code I'm using to draw the grid, it's in my panel_Paint event. g is the graphics context.

for (int y = 0; y < numOfCells * cellSize; y += cellSize)
{
     for (int x = 0; x < numOfCells * cellSize; x += cellSize)
     {
          g.DrawLine(p, x, 0, x, y + numOfCells * cellSize);
          g.DrawLine(p, 0, x, y + size * drawnGrid, x);
     }
}

When I run my program, it is unresponsive until it finishes drawing the grid, which takes a few seconds at numOfCells = 100 & cellSize = 10. Removing all the multiplication makes it faster, but not by very much.

Is there a better/more efficient way to draw my grid?

Thanks

解决方案

The problem is that you are drawing the X lines for every Y coordinate. You can simplify first by just rendering the Y lines in one loop and then the X lines in another loop.

Here is a quick example

  for (int y = 0; y < numOfCells; ++y)
  {
    g.DrawLine(p, 0, y * cellSize, numOfCells * cellSize, y * cellSize);
  }

  for (int x = 0; x < numOfCells; ++x)
  {
    g.DrawLine(p, x * cellSize, 0, x * cellSize, numOfCells * cellSize);
  }

As you progress, you can use double buffering to reduce any flashing etc. Take a look at Control.SetStyle < br/> http://msdn.microsoft.com/en-us/library/system.windows.forms.control.setstyle.aspx

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