GetViewBounds Method (original) (raw)
Summary
Current bounds of the view in physical (in control pixel) coordinates.
Syntax
Parameters
withPadding
true to include the value of ViewPadding when calculating the value, otherwise; false.
clipped
true to intersect the returned value with the current viewer control rectangle, otherwise; false.
Return Value
The view bounds in pixels or LeadRectD.Empty if the viewer does not have any items or if the view does not intersect with the control rectangle.
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();
};
}