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Author Topic: [SOLVED] how to render line with SFML?  (Read 4337 times)

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mkalex777

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[SOLVED] how to render line with SFML?
« on: December 03, 2015, 01:01:13 am »
I need to render simple line from point V1 to point V2 with thickness N.
How can I do it with SFML?

I know about Window.Draw with primitive type Line, but it render one pixel line. I need to specify line thickness.
« Last Edit: December 03, 2015, 09:16:21 am by mkalex777 »

zsbzsb

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Re: how to render line with SFML?
« Reply #1 on: December 03, 2015, 03:11:36 am »
Draw a rotated RectangleShape.
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mkalex777

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Re: how to render line with SFML?
« Reply #2 on: December 03, 2015, 07:51:11 am »
Can you help me with example. I have two Vector2f for start and end points. How to calculate rectangle position and angle?

mkalex777

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Re: how to render line with SFML?
« Reply #3 on: December 03, 2015, 08:46:45 am »
I got it :)

Code is here:
        public static void DrawLine(this RenderTarget target, Vector2f start, Vector2f end, float thickness, Color color)
        {
            var dv = end - start;
            var dl = (float)Math.Sqrt(dv.X * dv.X + dv.Y * dv.Y);
            var uv = dv / dl;
            var up = new Vector2f(-uv.Y, uv.X);
            var offset = up * (thickness / 2F);
            var array = new[]
            {
                new Vertex(start + offset, color),
                new Vertex(end + offset, color),
                new Vertex(end - offset, color),
                new Vertex(start - offset, color),
            };
            target.Draw(array, PrimitiveType.Quads);
        }
 

So simple primitive and so complicated code with SFML...
« Last Edit: December 03, 2015, 08:48:31 am by mkalex777 »

Hapax

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Re: how to render line with SFML?
« Reply #4 on: December 03, 2015, 10:19:24 pm »
So simple primitive and so complicated code with SFML...
I wouldn't say that the 13 lines of code in that function that you posted could be considered "complicated".

You could always consider using this  ;)
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