/// <summary>
/// Creates a WPF cursor from a win32 bitmap
/// </summary>
/// <param name="cursorBitmap"></param>
/// <returns></returns>
public static Cursor CreateCursor(Bitmap cursorBitmap)
{
var csh = new WPFCursorFromBitmap(cursorBitmap);
return CursorInteropHelper.Create(csh);
}
/// <summary>
/// Changes the cursor for this control to show the coordinates
/// </summary>
/// <param name="uiElement"></param>
private void SetCoordinatesOnCursor(FrameworkElement uiElement)
{
Point coordinate = locked ? lockPoint : lastCoordinate;
Cursor newCursor = null;
var cursorFont = new Font("Arial", 8f);
try
{
// Lets get the string to be printed
string coordinateText = coordinate.X.ToString(xFormat) + "," + coordinate.Y.ToString(yFormat);
// Calculate the rectangle required to draw the string
SizeF textSize = GetTextSize(coordinateText, cursorFont);
// ok, so here's the minimum 1/4 size of the bitmap we need, as the
// Hotspot for the cursor will be in the centre of the bitmap.
int minWidth = 8 + (int)Math.Ceiling(textSize.Width);
int minHeight = 8 + (int)Math.Ceiling(textSize.Height);
// If the bitmap needs to be resized, then resize it, else just clear it
if (cursorBitmap.Width < minWidth * 2 || cursorBitmap.Height < minHeight * 2)
{
Bitmap oldBitmap = cursorBitmap;
cursorBitmap = new Bitmap(Math.Max(cursorBitmap.Width, minWidth * 2),
Math.Max(cursorBitmap.Height, minHeight * 2));
oldBitmap.Dispose();
}
// Get the centre of the bitmap which will be the Hotspot
var centre = new System.Drawing.Point(cursorBitmap.Width / 2, cursorBitmap.Height / 2);
/// Calculate the text rectangle
var textRectangle = new Rectangle(centre.X + 8, centre.Y + 8, minWidth - 8, minHeight - 8);
int diff = (int)cursorPosition.X + textRectangle.Right / 2 - 3 - (int)uiElement.ActualWidth;
if (diff > 0)
{
textRectangle.Location = new System.Drawing.Point(textRectangle.Left - diff, textRectangle.Top);
}
// Draw the target symbol, and the coordinate text on the bitmap
using (Graphics g = Graphics.FromImage(cursorBitmap))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
// This line causes a crash on laptops when you render a string
// g.CompositingMode = CompositingMode.SourceCopy;
g.Clear(Color.Transparent);
float targetX = centre.X;
float targetY = centre.Y;
float radius = 30;
if (!locked)
{
var blackPen = new Pen(Color.FromArgb(255, 0, 0, 0), 1.4f);
g.DrawEllipse(blackPen, targetX - radius * .5f, targetY - radius * .5f, radius, radius);
g.DrawLine(blackPen, targetX - radius * .8f, targetY, targetX - 2f, targetY);
g.DrawLine(blackPen, targetX + 2f, targetY, targetX + radius * .8f, targetY);
g.DrawLine(blackPen, targetX, targetY - radius * .8f, targetX, targetY - 2f);
g.DrawLine(blackPen, targetX, targetY + 2f, targetX, targetY + radius * .8f);
}
else
{
var blackPen = new Pen(Color.FromArgb(255, 0, 0, 0), 3f);
var yellowPen = new Pen(Color.FromArgb(255, 255, 255, 0), 2f);
g.DrawEllipse(blackPen, targetX - radius * .5f, targetY - radius * .5f, radius, radius);
g.DrawEllipse(yellowPen, targetX - radius * .5f, targetY - radius * .5f, radius, radius);
}
if (!locked)
{
g.FillRectangle(new SolidBrush(Color.FromArgb(127, 255, 255, 255)), textRectangle);
}
else
{
g.FillRectangle(new SolidBrush(Color.FromArgb(170, 255, 255, 0)), textRectangle);
}
// Setup the text format for drawing the subnotes
using (var stringFormat = new StringFormat())
{
stringFormat.Trimming = StringTrimming.None;
stringFormat.FormatFlags = StringFormatFlags.NoClip | StringFormatFlags.NoWrap;
stringFormat.Alignment = StringAlignment.Near;
// Draw the string left aligned
g.DrawString(
coordinateText,
cursorFont,
new SolidBrush(Color.Black),
textRectangle,
stringFormat);
}
}
// Now copy the bitmap to the cursor
newCursor = WPFCursorFromBitmap.CreateCursor(cursorBitmap);
}
catch
{
Trace.WriteLine("Error drawing on cursor");
}
finally
{
// After the new cursor has been set, the unmanaged resources can be
// cleaned up that were being used by the old cursor
if (newCursor != null)
{
uiElement.Cursor = newCursor;
}
if (lastCursor != null)
{
lastCursor.Dispose();
}
lastCursor = newCursor;
// Save the new values for cleaning up on the next pass
}
}
/// <summary>
/// Creates a WPF cursor from a win32 bitmap
/// </summary>
/// <param name="cursorBitmap"></param>
/// <returns></returns>
public static Cursor CreateCursor(Bitmap cursorBitmap)
{
var csh = new WPFCursorFromBitmap(cursorBitmap);
return(CursorInteropHelper.Create(csh));
}
