ImageViewerRubberBandInteractiveMode Class (original) (raw)
This example will use ImageViewerRubberBandInteractiveMode to select a region of interest in the image. When the user finishes selecting the area, the example will draw a blue with yellow border rectangle on the image.
Start with the ImageViewer example, remove all the code inside the example function (search for the "// TODO: add example code here" comment) and insert the following code:
using Leadtools;
using Leadtools.Controls;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
public static bool AddRoundRect(GraphicsPath path, LeadRect bounds, int xRadius, int yRadius)
{
if (bounds.Width < 1 || bounds.Height < 1)
return false;
if (xRadius < 1 || yRadius < 1)
{
// Add a rectangle
path.AddRectangle(new Rectangle(bounds.X, bounds.Y, bounds.Width, bounds.Height));
return true;
}
int x = bounds.X;
int y = bounds.Y;
int width = bounds.Width;
int height = bounds.Height;
// adapt horizontal and vertical diameter if the rectangle is too little
int xDiameter = xRadius * 2;
int yDiameter = yRadius * 2;
if (width < (xDiameter))
xDiameter = width;
if (height < (yDiameter))
yDiameter = height;
xRadius = xDiameter / 2;
yRadius = yDiameter / 2;
int xw = x + width;
int yh = y + height;
int xwr = xw - xRadius;
int yhr = yh - yRadius;
int xr = x + xRadius;
int yr = y + yRadius;
int xwr2 = xw - xDiameter;
int yhr2 = yh - yDiameter;
path.StartFigure();
path.AddArc(x, y, xDiameter, yDiameter, 180, 90);
path.AddLine(xr, y, xwr, y);
path.AddArc(xwr2, y, xDiameter, yDiameter, 270, 90);
path.AddLine(xw, yr, xw, yhr);
path.AddArc(xwr2, yhr2, xDiameter, yDiameter, 0, 90);
path.AddLine(xwr, yh, xr, yh);
path.AddArc(x, yhr2, xDiameter, yDiameter, 90, 90);
path.AddLine(x, yhr, x, yr);
path.CloseFigure();
return true;
}
public void ImageViewerRubberBandInteractiveMode_Example()
{
ImageViewerRubberBandInteractiveMode rubberBandMode = new ImageViewerRubberBandInteractiveMode();
foreach (ImageViewerRubberBandShape shape in Enum.GetValues(typeof(ImageViewerRubberBandShape)))
_rubberBandShapesComboBox.Items.Add(shape);
_rubberBandShapesComboBox.SelectedItem = rubberBandMode.Shape;
_rubberBandShapesComboBox.SelectedIndexChanged += (sender, e) => rubberBandMode.Shape = (ImageViewerRubberBandShape)_rubberBandShapesComboBox.SelectedItem;
rubberBandMode.RubberBandCompleted += (sender, e) =>
{
if (e.IsCanceled)
return;
if (rubberBandMode.Item == null)
return;
LeadPoint[] points = new LeadPoint[e.Points.Count];
for (var i = 0; i < points.Length; i++)
points[i] = LeadPoint.Create(e.Points[i].X, e.Points[i].Y);
LeadPoint min = LeadPoint.Empty;
LeadPoint max = LeadPoint.Empty;
for (int i = 0; i < points.Length; i++)
{
points[i] = _imageViewer.ConvertPoint(rubberBandMode.Item, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, points[i]);
if (i == 0)
{
min = points[i];
max = points[i];
}
else
{
min.X = Math.Min(min.X, points[i].X);
min.Y = Math.Min(min.Y, points[i].Y);
max.X = Math.Max(max.X, points[i].X);
max.Y = Math.Max(max.Y, points[i].Y);
}
}
LeadPoint center = LeadPoint.Create(min.X + (max.X - min.X) / 2, min.Y + (max.Y - min.Y) / 2);
ImageViewerItem rasterItem = rubberBandMode.Item;
RasterImage image = rasterItem.Image;
IntPtr hdc = RasterImagePainter.CreateLeadDC(image);
using (Graphics graphics = Graphics.FromHdc(hdc))
{
using (GraphicsPath path = new GraphicsPath())
{
switch (rubberBandMode.Shape)
{
case ImageViewerRubberBandShape.Rectangle:
case ImageViewerRubberBandShape.Ellipse:
{
LeadRect rect = LeadRect.Normalize(LeadRect.FromLTRB(points[0].X, points[0].Y, points[1].X, points[1].Y));
Rectangle rc = new Rectangle(rect.X, rect.Y, rect.Width, rect.Height);
if (rubberBandMode.Shape == ImageViewerRubberBandShape.Rectangle)
path.AddRectangle(rc);
else
path.AddEllipse(rc);
}
break;
case ImageViewerRubberBandShape.RoundRectangle:
{
LeadSize radius = rubberBandMode.RoundRectangleRadius;
LeadRect rect = LeadRect.Normalize(LeadRect.FromLTRB(points[0].X, points[0].Y, points[1].X, points[1].Y));
AddRoundRect(path, rect, radius.Width, radius.Height);
}
break;
case ImageViewerRubberBandShape.Freehand:
{
bool firstPoint = true;
LeadPoint lastPoint = LeadPoint.Empty;
foreach (LeadPoint pt in points)
{
if (!firstPoint)
path.AddLine(lastPoint.X, lastPoint.Y, pt.X, pt.Y);
else
firstPoint = false;
lastPoint = pt;
}
}
break;
default:
break;
}
path.CloseFigure();
if (image.Width > 1000 || image.Height > 1000)
{
using (Pen pen = new Pen(Color.Yellow, 8))
graphics.DrawPath(pen, path);
}
else
{
graphics.DrawPath(Pens.Yellow, path);
}
}
}
RasterImagePainter.DeleteLeadDC(hdc);
_imageViewer.Invalidate();
};
rubberBandMode.AutoItemMode = ImageViewerAutoItemMode.AutoSet;
rubberBandMode.ItemPart = ImageViewerItemPart.Image;
_imageViewer.InteractiveModes.BeginUpdate();
_imageViewer.InteractiveModes.Add(rubberBandMode);
ImageViewerAutoPanInteractiveMode autopan = new ImageViewerAutoPanInteractiveMode();
autopan.PanDelay = 100;
_imageViewer.InteractiveModes.Add(autopan);
_imageViewer.InteractiveModes.EndUpdate();
}