/// <summary>
/// Initializes a new instance of the <see cref="CurveItem"/> class.
/// Sets up the OpenGL Objects VAO and VBO and AttribPointers
/// </summary>
/// <param name="pane">The pane.</param>
/// <param name="label">The label.</param>
/// <param name="points">The points.</param>
/// <param name="color">The color.</param>
/// <param name="linesShader">The lines shader.</param>
public CurveItem(GraphPane pane, string label, RollingVec2List points, Color color, LinesShader linesShader)
{
_rollingV2List = points;
_GraphVertex = new Vector2[points.Capacity];
_label = label;
_color = color;
_yAxisIndex = 0;
_linesShader = linesShader;
_pane = pane;
_linesShader.Use();//use the Shader, generate and bindd VAO and VBO
_VAO = GL.GenVertexArray();
_VBO = GL.GenBuffer();
GL.BindVertexArray(_VAO);
GL.EnableVertexAttribArray(_linesShader.VertexLocation); //enable the in variable of the Shader, where the Vertices are put
GL.BindBuffer(BufferTarget.ArrayBuffer, _VBO); //bind the VBO and give it an empty array
GL.BufferData <Vector2>(BufferTarget.ArrayBuffer, (IntPtr)(Vector2.SizeInBytes * _GraphVertex.Length), _GraphVertex, BufferUsageHint.StreamDraw);
//set up the Pointer for OpenGL to interpret Vertices
GL.VertexAttribPointer(_linesShader.VertexLocation, 2, VertexAttribPointerType.Float, false, Vector2.SizeInBytes, 0);
GL.BindVertexArray(0);
_linesShader.StopUse();
}
/// <summary>
/// Adds a Curve to the <see cref="GraphPane"/>, effectively
/// generating an entry to the <see cref="Legend"/> and the new <see cref="RollingVec2List"/>
/// to the <see cref="CurveList"/>.
/// </summary>
/// <param name="label">The label.</param>
/// <param name="points">The points.</param>
/// <param name="color">The color.</param>
/// <returns></returns>
public CurveItem AddCurve(string label, RollingVec2List points, Color color)
{
CurveItem curve = new CurveItem(this, label, points, color, _shaders.LineShader);
_curveList.Add(curve);
_legend.AddItem(label, color);
return(curve);
}