什么是更快的方式来绘制图形比绘制单独的行？ [英] What are the quicker ways to draw graphs than by drawing separate lines?

问题描述

截至目前我画与拉伸到必要的高度1px的矩形我调试性能图表，而是借鉴了很多数据，这种方式会导致显著的性能损失。

As of now I'm drawing my debug performance graphs with 1px rectangles stretched to necessary height, but drawing a lot of data this way causes significant performance loss.

目前的逻辑是：收集所有时序为当前帧，将它们放置到问答LT;浮动> 和按图纸300拉伸1px的精灵绘制每个队列的图表。有4个图形，所以它仅在调试覆盖，这是资源消耗1200精灵。

Currently the logic is: collect all timings for current frame, place them into the Queue<float>s and draw a graph for each queue by drawing 300 stretched 1px sprites. There are 4 graphs, so it's 1200 sprites in debug overlay alone, which is resource consuming.

有没有更好的方式来画，至少不需要绘制图表这么多的精灵？

Is there a better way to draw graphs that at least won't require drawing so many sprites?

推荐答案

您可以使用< A HREF =http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.graphics.vertexpositioncolor.aspx> VertexPositionColor 阵列来存储个人图表值，然后使用 GraphicsDevice.DrawUserIndexedPrimitives< VertexPositionColor> 与定义线一起列表（指数）与正交投影绘制它们。

Line List

You could use VertexPositionColor arrays to store individual graph values, then use GraphicsDevice.DrawUserIndexedPrimitives<VertexPositionColor> together with a defined line list (indices) to draw them with orthographic projection.

_{将.gif文件的大小，由于文件大小的50％。}

我画这些样品（图4 300价值点/像素，每个像素），在60fps。

I'm drawing these samples (4 graphs with 300 value points/pixels each) at 60fps.

如果您需要填充线下图，你可以得出一个三角形条替代（用点图的底部）。

If you need to fill the graphs below the line, you could draw a triangle strip instead (with points at bottom of the graph).

下面是相关的代码上面呈现的第一个图：

Here is the relevant code for the first graph rendered above:

Matrix worldMatrix;
Matrix viewMatrix;
Matrix projectionMatrix;
BasicEffect basicEffect;

VertexPositionColor[] pointList;
short[] lineListIndices;

protected override void Initialize()
{
    int n = 300;
    //GeneratePoints generates a random graph, implementation irrelevant
    pointList = new VertexPositionColor[n];
    for (int i = 0; i < n; i++)
        pointList[i] = new VertexPositionColor() { Position = new Vector3(i, (float)(Math.Sin((i / 15.0)) * height / 2.0 + height / 2.0 + minY), 0), Color = Color.Blue };

    //links the points into a list
    lineListIndices = new short[(n * 2) - 2];
    for (int i = 0; i < n - 1; i++)
    {
        lineListIndices[i * 2] = (short)(i);
        lineListIndices[(i * 2) + 1] = (short)(i + 1);
    }

    worldMatrix = Matrix.Identity;
    viewMatrix = Matrix.CreateLookAt(new Vector3(0.0f, 0.0f, 1.0f), Vector3.Zero, Vector3.Up);
    projectionMatrix = Matrix.CreateOrthographicOffCenter(0, (float)GraphicsDevice.Viewport.Width, (float)GraphicsDevice.Viewport.Height, 0, 1.0f, 1000.0f);

    basicEffect = new BasicEffect(graphics.GraphicsDevice);
    basicEffect.World = worldMatrix;
    basicEffect.View = viewMatrix;
    basicEffect.Projection = projectionMatrix;

    basicEffect.VertexColorEnabled = true; //important for color

    base.Initialize();
}

要绘制：

foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes)
{
    pass.Apply();
    GraphicsDevice.DrawUserIndexedPrimitives<VertexPositionColor>(
        PrimitiveType.LineList,
        pointList,
        0,
        pointList.Length,
        lineListIndices,
        0,
        pointList.Length - 1
    );
}

有关三角形带图，修改代码来显示的triangle条，并在图形曲线的每个点放一上该图的底部。

For the triangle strip graph, modify the code to display a triangle strip, and for each point in the graph curve put one on the bottom of the graph.

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