ViewTransform Property (original) (raw)
Summary
Current transformation matrix of the view.
Syntax
Property Value
The current transformation matrix of the view.
Example
using Leadtools;
using Leadtools.Controls;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
public void TestRedirectRender()
{
PictureBox control = new PictureBox();
control.Width = 400;
control.Dock = DockStyle.Right;
control.BringToFront();
_imageViewer.BringToFront();
bool renderView = false;
control.DoubleClick += (sender, e) =>
{
renderView = !renderView;
control.Invalidate();
};
control.Paint += (sender, e) =>
{
Graphics graphics = e.Graphics;
int delta = 20;
LeadRect destRect = LeadRect.Create(delta, delta, control.ClientSize.Width - delta * 2, control.ClientSize.Height - delta * 2);
LeadRect clipRect = destRect;
ImageViewerRenderRedirectOptions options = new ImageViewerRenderRedirectOptions();
ImageViewerItem item = null;
if (!renderView)
item = _imageViewer.Items[0];
LeadRectD sourceRect;
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;
}
options.CreateTransform(_imageViewer, destRect, sourceRect, ControlSizeMode.FitAlways, ControlAlignment.Center, ControlAlignment.Center);
clipRect = options.Transform.TransformRect(sourceRect).ToLeadRect();
_imageViewer.RenderRedirect(graphics, options, clipRect);
graphics.DrawRectangle(Pens.Black, destRect.X, destRect.Y, destRect.Width + 1, destRect.Height + 1);
// Now lets find out how much of the view is visible (something pan window would do)
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;
}
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) =>
{
control.Invalidate();
};
}