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CommanderLake

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About CommanderLake

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  1. CommanderLake

    Draw array of points with individual colors

    I'm very much not a graphics programmer so please try to be descriptive, my aim is to display data from a USB oscilloscope in my own way, I have the oscilloscope data stream in the form of shorts and I want to draw a squiggly line with it that fades away as new data comes in. Since I can already draw dots I figured that may be sufficient and not overcomplicate it as I can get sufficient data points to form a line with dots. I just need to be able to at least specify the alpha of the dots so I can make them fade away. This is what I use to draw points in another application: GL.Clear(ClearBufferMask.ColorBufferBit); GL.Color4(1.0F, 1.0F, 1.0F, 1.0F); GL.PointSize(1.0F); GL.Enable(EnableCap.PointSmooth); GL.Enable(EnableCap.Blend); GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha); GL.EnableClientState(ArrayCap.VertexArray); GL.Disable(EnableCap.DepthTest); GL.Disable(EnableCap.CullFace); GL.BindBuffer(BufferTarget.ArrayBuffer, vbo); GL.BufferData(BufferTarget.ArrayBuffer, buffersize, points1, BufferUsageHint.StaticDraw); GL.VertexPointer(2, VertexPointerType.Float, 0, 0); GL.DrawArrays(PrimitiveType.Points, 0, pcount); GL.BindBuffer(BufferTarget.ArrayBuffer, 0); GL.DisableClientState(ArrayCap.VertexArray); SwapBuffers();
  2. How do draw thousands of points each with their own individual brightness for a 2D visualisation? I use OpenTK in C#.
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