/// <summary>
/// Drawing of images in the style column
/// </summary>
private void dgvCategories_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
if (e.ColumnIndex != CMN_STYLE)
{
return;
}
if (e.RowIndex >= 0 && e.RowIndex < _shapefile.Categories.Count)
{
var img = e.Value as Image;
if (img == null)
{
return;
}
var cat = _shapefile.Categories[e.RowIndex];
if (cat == null)
{
return;
}
IGeometryStyle sdo = cat.Style;
using (Graphics g = Graphics.FromImage(img))
{
g.Clear(Color.White);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
if (_shapefile.GeometryType == GeometryType.Polygon)
{
sdo.DrawRectangle(g, 0.0f, 0.0f, img.Width - 1, img.Height - 1, true, img.Width, img.Height,
dgvCategories.BackgroundColor);
}
else if (_shapefile.GeometryType == GeometryType.Polyline)
{
sdo.DrawLine(g, 0.0f, 0.0f, img.Width - 1, img.Height - 1, true, img.Width, img.Height,
dgvCategories.BackgroundColor);
}
else if (_shapefile.PointOrMultiPoint)
{
sdo.DrawPoint(g, 0.0f, 0.0f, img.Width, img.Height, dgvCategories.BackgroundColor);
}
}
}
}
/// <summary>
/// Draws layer icon.
/// </summary>
/// <returns>Height of icon in screen coordinates.</returns>
private int DrawLayerIcon(ILegendLayer layer, IGeometryStyle options, Graphics g, float left, float top)
{
int width = _thumbnailWidth;
int height = _thumbnailHeight;
var fs = layer.FeatureSet;
if (fs == null)
{
return(height + 3);
}
var hdc = g.GetHdc();
GetIconWidthAndHeight(options, ref width, ref height);
left = (int)(left + 0.5);
top = (int)(top + 0.5);
if (fs.PointOrMultiPoint)
{
options.DrawPoint(hdc, left, top, width, height, _backColor);
}
else if (fs.IsPolyline)
{
options.DrawLine(hdc, left, top, width, height, false, width, height, _backColor);
}
else if (fs.IsPolygon)
{
options.DrawRectangle(hdc, left, top, width - 1, height - 1, false, width + 1, height + 1, _backColor);
}
g.ReleaseHdc(hdc);
return(height + 3);
}