当上重绘屏幕手动控制 [英] Manual control over when to redraw the screen

问题描述

我试图做出XNA回合制roguelike引擎的事情。我基本上比从以前的工作我没有使用名为libtcod基于SDL-roguelike库的移植游戏。我怎样才能修改基本XNA模板的东西，使游戏的不的重绘屏幕每帧，但是，相反，当我想要什么？

I'm trying to make a turn-based roguelike engine thing for XNA. I'm basically porting the game over from a previous work I did using an SDL-based roguelike library called libtcod. How can I modify the basic XNA template thing to make the game not redraw the screen every frame, but, instead, when I want?

推荐答案

这样做的正确的方法是调用 GraphicsDevice.Present（）每当你想绘制后台缓冲到屏幕上。

The correct method for doing this is to call GraphicsDevice.Present() whenever you want to draw the back buffer onto the screen.

现在这里的困难是游戏类会自动调用礼物给你（特别是在 Game.EndDraw ），这是你不希望它做的事。幸运的是游戏提供了一些方法，以防止目前被称为：

Now the difficulty here is that the Game class automatically calls Present for you (specifically in Game.EndDraw), which is something you don't want it to do. Fortunately Game provides a number of ways to prevent Present from being called:

最好的办法是重写 BeginDraw 并使其返回false，以防止一帧被吸入（包括防止绘图和 EndDraw 被调用），像这样：

The best way would be to override BeginDraw and have it return false, to prevent a frame from being drawn (including preventing Draw and EndDraw from being called), like so:

protected override bool BeginDraw()
{
    if(readyToDraw)
        return base.BeginDraw();
    else
        return false;
}

其他的替代品来调用的 Game.SuppressDraw ，或覆盖 EndDraw 这样，它不叫 base.EndDraw（），直到你准备要在屏幕上显示一个框架。

The other alternatives are to call Game.SuppressDraw, or to override EndDraw such that it does not call base.EndDraw() until you are ready to have a frame displayed on screen.

我个人简单地画每一帧。

Personally I would simply draw every frame.

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