public static readonly int MaxRegionFrameIndex
The maximum region frame index.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
public void FrameRegionExample()
{
FrameRegionForm f = new FrameRegionForm();
f.ShowDialog();
}
class FrameRegionForm : Form
{
private int frameIndex;
private RasterImage image;
private System.Windows.Forms.Timer timer;
private bool fillRegion;
public FrameRegionForm()
{
// Load the image
using (RasterCodecs codecs = new RasterCodecs())
{
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
image = codecs.Load(srcFileName);
}
// Add a region to the image
LeadRect rc = new LeadRect(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3);
RasterRegionXForm xform = new RasterRegionXForm();
xform.ViewPerspective = RasterViewPerspective.TopLeft;
image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set);
// initialize the frame index
frameIndex = 0;
fillRegion = true;
Text = "Double click to enable/disable filling the region";
// Create the timer
timer = new System.Windows.Forms.Timer();
timer.Interval = 100;
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
protected override void Dispose(bool disposing)
{
// Clean up
if (disposing)
{
if (timer != null)
{
timer.Dispose();
}
if (image != null)
{
image.Dispose();
}
}
base.Dispose(disposing);
}
protected override void OnDoubleClick(EventArgs e)
{
fillRegion = !fillRegion;
Invalidate();
base.OnDoubleClick(e);
}
private RasterRegionXForm GetXForm(LeadRect destRect)
{
// Calculate xform when the image is painted into 'destRect'
RasterRegionXForm xform = new RasterRegionXForm();
xform.ViewPerspective = RasterViewPerspective.TopLeft;
xform.XOffset = destRect.Left;
xform.YOffset = destRect.Top;
xform.XScalarDenominator = image.Width;
xform.XScalarNumerator = destRect.Width;
xform.YScalarDenominator = image.Height;
xform.YScalarNumerator = destRect.Height;
return xform;
}
protected override void OnPaint(PaintEventArgs e)
{
// Draw the image fit and center on this form
LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);
destRect = RasterImage.CalculatePaintModeRectangle(
image.ImageWidth,
image.ImageHeight,
destRect,
RasterPaintSizeMode.Fit,
RasterPaintAlignMode.Center,
RasterPaintAlignMode.Center);
LeadRect clipRect = LeadRect.FromLTRB(e.ClipRectangle.Left, e.ClipRectangle.Top, e.ClipRectangle.Right, e.ClipRectangle.Bottom);
RasterImagePainter.Paint(image, e.Graphics, LeadRect.Empty, LeadRect.Empty, destRect, clipRect, RasterPaintProperties.Default);
if (fillRegion)
{
RasterRegionXForm xform = GetXForm(destRect);
RasterImagePainter.FillRegion(image, e.Graphics, xform, new RasterColor(255, 0, 255));
}
base.OnPaint(e);
}
private void timer_Tick(object sender, EventArgs e)
{
// Frame the image region
LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);
destRect = RasterImage.CalculatePaintModeRectangle(
image.ImageWidth,
image.ImageHeight,
destRect,
RasterPaintSizeMode.Fit,
RasterPaintAlignMode.Center,
RasterPaintAlignMode.Center);
RasterRegionXForm xform = GetXForm(destRect);
using (Graphics g = CreateGraphics())
{
RasterImagePainter.FrameRegion(image, g, xform, frameIndex);
}
// advance to next frame
frameIndex++;
if (frameIndex > RasterImagePainter.MaxRegionFrameIndex)
{
frameIndex = 0;
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
When painting an image region using FrameRegion(RasterImage,Graphics,RasterRegionXForm,Int32), you can animate the region frame by cycling through the region frames for 0 to MaxRegionFrameIndex.
For more information refer to RasterImage and GDI/GDI+.