How to make Triangle obect in Windows Form?-CodePudding

I want to draw/make a triangle graphic that will appear right after when I run the program but I can't figure out the right command. Here's the command I use to make a rectangle object.

private void Form1_Paint(object sender, PaintEventArgs e)
{ 
e.Graphics.FillRectangle(Brushes.Aquamarine, _x, _y, 100, 100); 
}

Example

So when I make the object, I'll make it move automatically.

I've searched for tutorials but couldn't find anything suitable. Please help.

CodePudding user response：

There is DrawPolygon which probably does what you want, you just need to specify the three vertices of your triangle.

https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics.drawpolygon?view=dotnet-plat-ext-6.0

Edit: FillPolygon is probably more in line with what you need, sorry.

https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics.fillpolygon?view=dotnet-plat-ext-6.0

CodePudding user response：

You can use FillPolygon and specify 3 triangle points.

e.Graphics.FillPolygon(Brushes.Aquamarine, new Point[] { new Point(150, 100), new Point(100, 200), new Point(200, 200) });

Or you can create a FillTriangle extension method

public static class Extensions
{
    public static void FillTriangle(this Graphics g, PaintEventArgs e, Point p, int size)
    {
        e.Graphics.FillPolygon(Brushes.Aquamarine, new Point[] { p, new Point(p.X - size, p.Y   (int)(size * Math.Sqrt(3))), new Point(p.X   size, p.Y   (int)(size * Math.Sqrt(3))) });
    }
}

And call like this

e.Graphics.FillTriangle(e, new Point(150, 100), 500);

For right triangle use this

e.Graphics.FillPolygon(Brushes.Aquamarine, new Point[] { p, new Point(p.X, p.Y   size * 2), new Point(p.X   size, p.Y   size * 2) });

For obtuse this

e.Graphics.FillPolygon(Brushes.Aquamarine, new Point[] { p, new Point(p.X - size, p.Y   height), new Point(p.X   size, p.Y   height) });