Indicates whether to render the item states.
public bool RenderItemStates { get; set; }
public:
property bool RenderItemStates
{
bool get()
void set(bool value)
}
true to render the item states, otherwise; false. Default value is true.
This member will control whether IsSelected, IsHovered the current active item will be used during RenderRedirect. For more information, refer to Image Viewer Rendering.
using Leadtools;
using Leadtools.Controls;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
public ImageViewerForm _form = new ImageViewerForm();
public ImageViewer _imageViewer;
public PictureBox redirectRenderControl;
public void ImageViewerRedirectRenderExample()
{
// Get the ImageViewer control from the form
_imageViewer = _form.ImageViewer;
// Load an image
using (var codecs = new RasterCodecs())
_imageViewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg"));
// PanZoom Interactive Mode
_imageViewer.DefaultInteractiveMode = new ImageViewerPanZoomInteractiveMode();
// Separate Form with PictureBox control
Form redirectRenderForm = new Form();
redirectRenderControl = new PictureBox();
redirectRenderControl.Width = 400;
redirectRenderControl.Dock = DockStyle.Fill;
redirectRenderForm.Controls.Add(redirectRenderControl);
redirectRenderForm.Show();
// Invalidate on double-click
bool renderView = false;
redirectRenderControl.DoubleClick += (sender, e) =>
{
renderView = !renderView;
redirectRenderControl.Invalidate();
};
redirectRenderControl.Paint += (sender, e) =>
{
if (_imageViewer.Image == null)
return;
// Get PictureBox Graphics object
Graphics graphics = e.Graphics;
// Destination rectangle in PictureBox
int margin = 20;
LeadRect destRect = LeadRect.Create(margin, margin, redirectRenderControl.ClientSize.Width - margin * 2, redirectRenderControl.ClientSize.Height - margin * 2);
LeadRect clipRect = destRect;
// Source rectangle
Debug.WriteLine(_imageViewer.ViewSize);
// RenderRedirect Options
ImageViewerRenderRedirectOptions options = new ImageViewerRenderRedirectOptions();
options.BackgroundColor = Color.Transparent;
// Try to get item from the viewer
ImageViewerItem item = null;
if (!renderView)
item = _imageViewer.Items[0];
LeadRectD sourceRect = LeadRectD.Empty;
if (item == null)
sourceRect = _imageViewer.GetViewBounds(true, false);
else
{
sourceRect = _imageViewer.GetItemViewBounds(item, ImageViewerItemPart.Image, false);
options.RenderBackgrounds = false;
options.RenderBorders = false;
options.RenderItemStates = false;
options.RenderShadows = false;
options.RenderText = false;
}
// Transformation Matrix (represents rotation, zooming...etc)
Debug.WriteLine(_imageViewer.ViewTransform);
options.CreateTransform(_imageViewer, destRect, sourceRect, ControlSizeMode.FitAlways, ControlAlignment.Center, ControlAlignment.Center);
clipRect = options.Transform.TransformRect(sourceRect).ToLeadRect();
// Redirect rendering to the PictureBox Graphics object (Outlined with a black rectangle)
_imageViewer.RenderRedirect(graphics, options, clipRect);
graphics.DrawRectangle(Pens.Black, destRect.X, destRect.Y, destRect.Width + 1, destRect.Height + 1);
// Calculate visible view
LeadRectD rect;
if (item == null)
rect = _imageViewer.GetViewBounds(true, true);
else
rect = _imageViewer.GetItemViewBounds(item, ImageViewerItemPart.Image, true);
LeadPointD[] points =
{
LeadPointD.Create(rect.Left, rect.Top),
LeadPointD.Create(rect.Right, rect.Bottom)
};
options.Transform.TransformPoints(points);
double xmin = points[0].X;
double ymin = points[0].Y;
double xmax = xmin;
double ymax = ymin;
for (int i = 1; i < points.Length; i++)
{
if (points[i].X < xmin) xmin = points[i].X;
if (points[i].X > xmax) xmax = points[i].X;
if (points[i].Y < ymin) ymin = points[i].Y;
if (points[i].Y > ymax) ymax = points[i].Y;
}
// Draw yellow rectangle showing visible part of the view
LeadRectD bounds = LeadRectD.FromLTRB(xmin, ymin, xmax, ymax);
RectangleF rc = new RectangleF((float)bounds.X, (float)bounds.Y, (float)bounds.Width, (float)bounds.Height);
graphics.DrawRectangle(Pens.Yellow, rc.X, rc.Y, rc.Width - 1, rc.Height - 1);
};
_imageViewer.RedirectRender += (sender, e) =>
{
redirectRenderControl.Invalidate();
};
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images";
}
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