/// <summary>
/// ビットマップにベクトル図を描画します。
/// </summary>
/// <param name="bmp">描画先の System.Drawing.Bitmap</param>
/// <param name="data">元となる 2 次元配列データ</param>
/// <exception cref="Visualization.VectorDataNotFoundException">ベクトルデータがないときに投げられます。</exception>
public override void DrawTo( Canvas canvas, IDataSheet data )
{
Bitmap bmp = canvas.Bitmap;
if( !this.Setting.Show )
{
return;
}
if( !data.HasVectorData )
{
throw new VectorDataNotFoundException( "ベクトルデータがありません" );
}
if( !this.Setting.IsLengthFixed )
{
this.Setting.ReferredLength = data.MaxVector;
}
Graphics g = Graphics.FromImage( bmp );
Pen p = new Pen( Setting.LineColor );
Brush b = new SolidBrush( Setting.InnerColor );
ArrowDrawer d = new ArrowDrawer( g, this.Setting, data.MaxVector, data.MinVector );
int start = (this.Setting.Interval > 1) ? this.Setting.Offset : 0;
int step = this.Setting.Interval;
HashSet<int> iSet = new HashSet<int>();
HashSet<int> jSet = new HashSet<int>();
if( this.Setting.FixedBound )
{
iSet.Add( 0 );
jSet.Add( 0 );
}
for( int i=start; i<data.Columns; i += step )
{
iSet.Add( i );
}
for( int j=start; j<data.Rows; j += step )
{
jSet.Add( j );
}
if( this.Setting.FixedBound )
{
iSet.Add( data.Columns-1 );
jSet.Add( data.Rows-1 );
}
foreach( var i in iSet )
{
foreach( var j in jSet )
{
Point pt = canvas.AsBitmapCoord( data.GetX( i ), data.GetY( j ) );
double u = data.GetU( i, j );
double v = data.GetV( i, j );
double len = Math.Sqrt( u*u + v*v );
d.DrawArrow( pt, u, v );
}
}
}
private void pictureBoxPreview_Paint( object sender, PaintEventArgs e )
{
ArrowDrawer d = new ArrowDrawer( e.Graphics, this.previewSetting, 1.5, 0 );
for( int i=0; i<4; i++ )
{
for( int j=0; j<2; j++ )
{
double len = 1.5 - 0.3*i - 0.3*j;
double angle = Math.Atan2( 0.25, 1.0 );
d.DrawArrow( new PointF( i*70F+20F, 80F-j*40F ), len*Math.Cos( angle ), len*Math.Sin( angle ) );
}
}
}
