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public struct RasterPaintProperties
The various RasterImagePainter.Paint method overloads require an instance of RasterPaintProperties to be passed. The members of the RasterPaintProperties controls the speed, quality, and style used when painting.
The following example creates a Windows form with various controls to show different RasterPaintProperties options.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;
public void RasterPaintPropertiesExample()
{
// Create the form
PaintPropertiesForm f = new PaintPropertiesForm();
f.ShowDialog();
}
class PaintPropertiesForm : Form
{
private int index = 0;
private RasterImage rasterImage;
private RasterPaintProperties paintProperties;
public PaintPropertiesForm()
{
Text = "GDI paint engine - normal - Double click to show next RasterPaintProperties options";
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.UserPaint, true);
// Load an image
string fileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");
using (RasterCodecs codecs = new RasterCodecs())
{
codecs.ThrowExceptionsOnInvalidImages = true;
rasterImage = codecs.Load(fileName);
}
paintProperties = RasterPaintProperties.Default;
// Start with GDI paint engine and normal paint scaling
paintProperties.PaintEngine = RasterPaintEngine.Gdi;
paintProperties.PaintDisplayMode = RasterPaintDisplayModeFlags.None;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (rasterImage != null)
rasterImage.Dispose();
}
base.Dispose(disposing);
}
protected override void OnDoubleClick(EventArgs e)
{
switch (index)
{
case 0:
Text = "GDI paint engine - SourceAnd ROP - Double click to show next RasterPaintProperties options";
paintProperties.RasterOperation = RasterPaintProperties.SourceAnd;
break;
case 1:
Text = "GDI paint engine - Scale to gray - Double click to show next RasterPaintProperties options";
paintProperties.RasterOperation = RasterPaintProperties.SourceCopy;
paintProperties.PaintDisplayMode = RasterPaintDisplayModeFlags.ScaleToGray;
break;
case 2:
Text = "GDI+ paint engine - Double click to set the opacity";
paintProperties.PaintEngine = RasterPaintEngine.GdiPlus;
break;
case 3:
Text = "GDI+ paint engine - Opacity set to 50% - Done";
paintProperties.Opacity = 128;
break;
default:
break;
}
index++;
Invalidate();
base.OnDoubleClick(e);
}
protected override void OnPaint(PaintEventArgs e)
{
// Paint the image
LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);
destRect = RasterImage.CalculatePaintModeRectangle(
rasterImage.ImageWidth,
rasterImage.ImageHeight,
destRect,
RasterPaintSizeMode.Fit,
RasterPaintAlignMode.Center,
RasterPaintAlignMode.Center);
RasterImagePainter.Paint(rasterImage, e.Graphics, destRect, paintProperties);
base.OnPaint(e);
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}