private void Chart_Paint( object sender, PaintEventArgs e )
{
Graphics g = e.Graphics;
int clientWidth = ClientRectangle.Width;
int clientHeight = ClientRectangle.Height;
// fill with white background
Brush backgroundBrush = new SolidBrush( BackColor );
g.FillRectangle( backgroundBrush, 0, 0, clientWidth - 1, clientHeight - 1 );
backgroundBrush.Dispose( );
// draw a black rectangle
g.DrawRectangle( blackPen, 0, 0, clientWidth - 1, clientHeight - 1 );
// set clipping rectangle
g.SetClip( new Rectangle( 2, 2, clientWidth - 4, clientHeight - 4 ) );
// check if there are any data series
if ( rangeX.Length != 0 )
{
double xFactor = (double) ( clientWidth - 10 ) / ( rangeX.Length );
double yFactor = (double) ( clientHeight - 10 ) / ( ( rangeY.Length != 0 ) ? rangeY.Length : 1 );
// walk through all data series
foreach ( KeyValuePair<string, DataSeries> kvp in seriesTable )
{
DataSeries series = kvp.Value;
// get data of the series
double[,] data = series.data;
// check for available data
if ( data == null )
continue;
// check series type
if ( series.type == SeriesType.Dots )
{
// draw dots
Brush brush = new SolidBrush( series.color );
int width = series.width;
int r = width >> 1;
// draw all points
for ( int i = 0, n = data.GetLength( 0 ); i < n; i++ )
{
int x = (int) ( ( data[i, 0] - rangeX.Min ) * xFactor );
int y = (int) ( ( data[i, 1] - rangeY.Min ) * yFactor );
x += 5;
y = clientHeight - 6 - y;
g.FillRectangle( brush, x - r, y - r, width, width );
}
brush.Dispose( );
}
else if ( series.type == SeriesType.ConnectedDots )
{
// draw dots connected with 1-pixel width line
Brush brush = new SolidBrush( series.color );
Pen pen = new Pen( series.color, 1 );
int width = series.width;
int r = width >> 1;
int x1 = (int) ( ( data[0, 0] - rangeX.Min ) * xFactor );
int y1 = (int) ( ( data[0, 1] - rangeY.Min ) * yFactor );
x1 += 5;
y1 = clientHeight - 6 - y1;
g.FillRectangle( brush, x1 - r, y1 - r, width, width );
// draw all lines
for ( int i = 1, n = data.GetLength( 0 ); i < n; i++ )
{
int x2 = (int) ( ( data[i, 0] - rangeX.Min ) * xFactor );
int y2 = (int) ( ( data[i, 1] - rangeY.Min ) * yFactor );
x2 += 5;
y2 = clientHeight - 6 - y2;
g.FillRectangle( brush, x2 - r, y2 - r, width, width );
g.DrawLine( pen, x1, y1, x2, y2 );
x1 = x2;
y1 = y2;
}
pen.Dispose( );
brush.Dispose( );
}
else if ( series.type == SeriesType.Line )
{
// draw line
Pen pen = new Pen( series.color, series.width );
int x1 = (int) ( ( data[0, 0] - rangeX.Min ) * xFactor );
int y1 = (int) ( ( data[0, 1] - rangeY.Min ) * yFactor );
x1 += 5;
y1 = clientHeight - 6 - y1;
// draw all lines
for ( int i = 1, n = data.GetLength( 0 ); i < n; i++ )
{
int x2 = (int) ( ( data[i, 0] - rangeX.Min ) * xFactor );
int y2 = (int) ( ( data[i, 1] - rangeY.Min ) * yFactor );
x2 += 5;
y2 = clientHeight - 6 - y2;
g.DrawLine( pen, x1, y1, x2, y2 );
x1 = x2;
y1 = y2;
}
pen.Dispose( );
}
}
}
}
