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我如何在单体组中绘制线条？

发布于 2025-02-14 01:11:45 字数 155 浏览 0 评论 0原文

几天前，我刚刚开始学习单体组，我想知道如何从start vector2和具有特定行厚度的End vector2绘制一条线？

我是否应该使用一个像素图像将其绘制到屏幕上，然后使用Bresenham的线算法来查找位置，还是使用函数内置的单game来进行更优化且更复杂的方法来执行此操作？

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携余温的黄昏 2025-02-21 01:11:45

一种方法是创建一个texture2d，其宽度是两个vector2 s与所需宽度的高度之间的距离。然后，当您绘制纹理时，将旋转旋转应用于纹理。

这是一个示例（作为SpriteBatch扩展方法）：

public static void DrawLineBetween(
    this SpriteBatch spriteBatch,
    Vector2 startPos,
    Vector2 endPos,
    int thickness,
    Color color)
{
    // Create a texture as wide as the distance between two points and as high as
    // the desired thickness of the line.
    var distance = (int)Vector2.Distance(startPos, endPos);
    var texture = new Texture2D(spriteBatch.GraphicsDevice, distance, thickness);

    // Fill texture with given color.
    var data = new Color[distance * thickness];
    for (int i = 0; i < data.Length; i++)
    {
        data[i] = color;
    }
    texture.SetData(data);

    // Rotate about the beginning middle of the line.
    var rotation = (float)Math.Atan2(endPos.Y - startPos.Y, endPos.X - startPos.X);
    var origin = new Vector2(0, thickness / 2);

    spriteBatch.Draw(
        texture,
        startPos,
        null,
        Color.White,
        rotation,
        origin,
        1.0f,
        SpriteEffects.None,
        1.0f);
}

使用示例：

var startPos = new Vector2(0, 0);
var endPos = new Vector2(800, 480);
_spriteBatch.DrawLineBetween(startPos, endPos, 12, Color.White);

a href =“ https://i.sstatic.net/3ccccc9.png” rel =“ nofollow noreferrer“> ”输入图像描述在这里”

这不是一个完美的解决方案。如果您想以不同的角度绘制连接的线路，而没有任何可见的接缝，则需要对其进行修改。也不确定性能。

One way is to create a Texture2D with a width that is the distance between the two Vector2s and a height that is the desired width. Then you apply a rotation to the texture when you draw it.

Here is an example (as a SpriteBatch extension method):

public static void DrawLineBetween(
    this SpriteBatch spriteBatch,
    Vector2 startPos,
    Vector2 endPos,
    int thickness,
    Color color)
{
    // Create a texture as wide as the distance between two points and as high as
    // the desired thickness of the line.
    var distance = (int)Vector2.Distance(startPos, endPos);
    var texture = new Texture2D(spriteBatch.GraphicsDevice, distance, thickness);

    // Fill texture with given color.
    var data = new Color[distance * thickness];
    for (int i = 0; i < data.Length; i++)
    {
        data[i] = color;
    }
    texture.SetData(data);

    // Rotate about the beginning middle of the line.
    var rotation = (float)Math.Atan2(endPos.Y - startPos.Y, endPos.X - startPos.X);
    var origin = new Vector2(0, thickness / 2);

    spriteBatch.Draw(
        texture,
        startPos,
        null,
        Color.White,
        rotation,
        origin,
        1.0f,
        SpriteEffects.None,
        1.0f);
}

Example of use:

var startPos = new Vector2(0, 0);
var endPos = new Vector2(800, 480);
_spriteBatch.DrawLineBetween(startPos, endPos, 12, Color.White);

How it looks:

It's not a perfect solution. You'll want to modify it if you want to draw connected lines with different angles without any visible seams. Also not sure about the performance.

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