绘制矩形与XNA [英] Draw Rectangle with XNA

问题描述

我工作的游戏。我想强调的事情发生的时候，屏幕上的一个点

I am working on game. I want to highlight a spot on the screen when something happens.

我创建了一个类来为我做这一点，并找到了一些代码来绘制矩形：

I created a class to do this for me, and found a bit of code to draw the rectangle:

static private Texture2D CreateRectangle(int width, int height, Color colori)
{
    Texture2D rectangleTexture = new Texture2D(game.GraphicsDevice, width, height, 1, TextureUsage.None,
    SurfaceFormat.Color);// create the rectangle texture, ,but it will have no color! lets fix that
    Color[] color = new Color[width * height];//set the color to the amount of pixels in the textures
    for (int i = 0; i < color.Length; i++)//loop through all the colors setting them to whatever values we want
    {
        color[i] = colori;
    }
    rectangleTexture.SetData(color);//set the color data on the texture
    return rectangleTexture;//return the texture
}

的问题是，上述代码被称为每次更新，（60次），以及它没有考虑优化写入。它需要非常快的（上面的代码冻结的游戏，它只有骨架代码现在）。

The problem is that the code above is called every update, (60 times a second), and it was not written with optimization in mind. It needs to be extremely fast (the code above freezes the game, which has only skeleton code right now).

任何建议

请注意：任何新代码将是巨大的（线框/填充都好）。我想可以指定颜色。

Note: Any new code would be great (WireFrame/Fill are both fine). I would like to be able to specify color.

推荐答案

的在XNA创作者俱乐部网站SafeArea演示有代码，具体做到这一点。

The SafeArea demo on the XNA Creators Club site has code to do specifically that.

您不必创建纹理每一帧，只需在 LoadContent 。从演示代码的一个非常精简版：

You don't have to create the Texture every frame, just in LoadContent. A very stripped down version of the code from that demo:

public class RectangleOverlay : DrawableGameComponent
{
    SpriteBatch spriteBatch;
    Texture2D dummyTexture;
    Rectangle dummyRectangle;
    Color Colori;

    public RectangleOverlay(Rectangle rect, Color colori, Game game)
        : base(game)
    {
        // Choose a high number, so we will draw on top of other components.
        DrawOrder = 1000;
        dummyRectangle = rect;
        Colori = colori;
    }

    protected override void LoadContent()
    {
        spriteBatch = new SpriteBatch(GraphicsDevice);
        dummyTexture = new Texture2D(GraphicsDevice, 1, 1);
        dummyTexture.SetData(new Color[] { Color.White });
    }

    public override void Draw(GameTime gameTime)
    {
        spriteBatch.Begin();
        spriteBatch.Draw(dummyTexture, dummyRectangle, Colori);
        spriteBatch.End();
    }
}

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