private void OnEnable()
{
m_testGraph = new Graph();
m_testGraph.Min_Y = -1;
m_testGraph.Max_Y = 1;
m_testGraph.WindowWidth = 64;
m_testGraph.Channels[ 0 ].Data = GenerateTestData();
m_testGraph.Channels[ 0 ].isActive = true;
}
public static void DrawGraph( Graph graph, Rect position )
{
GUI.Box( position, "Graph" );
// Check if channels exist
if( graph.Channels == null )
return;
// Set the material pass.... for reasons.
m_lineMaterial.SetPass( 0 );
// The x-axis spacing
float xSpacing = position.width / ( graph.WindowWidth - 1 );
// The y-axis spacing
float ySpacing = position.height / ( graph.Max_Y - graph.Min_Y );
// The x-axis position offset
int xOffset = (int)( position.x );
// The y-axis position offset
float ratio = Mathf.Clamp01( graph.Max_Y / ( graph.Max_Y - graph.Min_Y ) );
int yOffset = (int)( position.y + (position.height * ratio) );
// Let's start drawing!
GL.PushMatrix();
GL.LoadPixelMatrix();
GL.Begin( GL.LINES );
// Draw the axis!
GL.Color( Color.cyan );
// x axis
GL.Vertex3( position.x, yOffset, 0.0f );
GL.Vertex3( position.x + position.width, yOffset, 0.0f );
// y axis
GL.Vertex3( xOffset, position.y, 0.0f );
GL.Vertex3( xOffset, position.y + position.height, 0.0f );
// Examine all channels in the graph
for( int channelIndex = 0; channelIndex < graph.Channels.Length; channelIndex++ )
{
// Grab the current channel as C
Channel C = graph.Channels[ channelIndex ];
// Should never happen. Log an error if it does.
if( C == null )
{
Debug.LogError( "Channel [" + channelIndex +"] is of null value." );
continue;
}
// If this channel is inactive or contains no data we don't want to do jack!
if( !C.isActive || C.Data == null )
continue;
// This is where we set the colour!
GL.Color( C.Colour );
// Variables to hold previous positions. The initial positions are equal to the axis offsets.
int lastX = xOffset;
int lastY = yOffset;
// Now we begin processing each sample for the current window
for( int dataIndex = 0; dataIndex < graph.WindowWidth; dataIndex++ )
{
// We don't want no out of range exceptions!
if (dataIndex + graph.X_Offset > C.Data.Length - 1)
break;
// Retrieve the amplitude
float amplitude = C.Data[ graph.X_Offset + dataIndex ];
// Calculate the current sample point
int xPix = (int)( xOffset + dataIndex * xSpacing );
int yPix = (int)( yOffset + -1 * Mathf.Clamp( amplitude, graph.Min_Y, graph.Max_Y ) * ySpacing );
// Draw from the last point to the current point.
GL.Vertex3( lastX, lastY, 0 );
GL.Vertex3( xPix, yPix, 0 );
// Record current point as the next iterations' last point.
lastX = xPix;
lastY = yPix;
}
}
GL.End();
GL.PopMatrix();
}
