如何画一条带箭头的线？

发布于 2024-09-12 17:12:10 字数 382 浏览 7 评论 0原文

我有以下代码，它用一个（非常）小箭头绘制一条线...

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Pen p = new Pen(Color.Black);
    p.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;

    e.Graphics.DrawLine(p, 10, 10, 100, 100);
    p.Dispose();
}

我想绘制一个大箭头（圆形，正方形，三角形等...... .)，保持相同的线宽。

是否可以？

原文

I have the following code, that draws a line with a (very) small arrow...

private void Form1_Paint(object sender, PaintEventArgs e)
{
    Pen p = new Pen(Color.Black);
    p.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;

    e.Graphics.DrawLine(p, 10, 10, 100, 100);
    p.Dispose();
}

I want to draw a big arrow (circle, square, triangle etc...), keeping the same line width.

Is it possible?

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单挑你×的.吻 2024-09-19 17:12:10

您希望将 CustomLineCap 与 GraphicsPath 一起使用。下面是一个示例：

using(Pen p = new Pen(Color.Black))
using(GraphicsPath capPath = new GraphicsPath())
{
    // A triangle
    capPath.AddLine(-20, 0, 20, 0);
    capPath.AddLine(-20, 0, 0, 20);
    capPath.AddLine(0, 20, 20, 0);

    p.CustomEndCap = new System.Drawing.Drawing2D.CustomLineCap(null, capPath);

    e.Graphics.DrawLine(p, 0, 50, 100, 50);
}

您想要用一条从上到下、从 (0, 0) 开始的线来“设计”您的帽子，以获得正确的坐标。

编辑：我只是想提一下，您还可以使用 AdjustableArrowCap 绘制特定尺寸的箭头并填充它，但因为您提到了其他形状的要求，所以我'我用过 CustomLineCap。

You'd want to use a CustomLineCap with a GraphicsPath. Here's an example:

using(Pen p = new Pen(Color.Black))
using(GraphicsPath capPath = new GraphicsPath())
{
    // A triangle
    capPath.AddLine(-20, 0, 20, 0);
    capPath.AddLine(-20, 0, 0, 20);
    capPath.AddLine(0, 20, 20, 0);

    p.CustomEndCap = new System.Drawing.Drawing2D.CustomLineCap(null, capPath);

    e.Graphics.DrawLine(p, 0, 50, 100, 50);
}

You want to "design" your cap with a line going top-to-bottom and from (0, 0) to get the correct coordinates.

EDIT: I just wanted to mention that you can also use AdjustableArrowCap to draw an arrow of a specific size and fill it but because you mentioned the requirement for other shapes, I've used a CustomLineCap.

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最偏执的依靠 2024-09-19 17:12:10

正如 TheCloudlessSky 提到的，AdjustableArrowCap 可用于绘制箭头。

public static void DrawLine(Graphics g, Point from, Point to)
{
    var pen = new Pen(Color.Black, 1);

    pen.CustomEndCap = new AdjustableArrowCap(5, 5);

    g.DrawLine(pen, from, to);
}

As TheCloudlessSky mentioned, AdjustableArrowCap can be used to draw the arrow head.

public static void DrawLine(Graphics g, Point from, Point to)
{
    var pen = new Pen(Color.Black, 1);

    pen.CustomEndCap = new AdjustableArrowCap(5, 5);

    g.DrawLine(pen, from, to);
}

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