// Initialize start of line drawing routine.
public void StartLineDraw(Graphics grPad, Point ptStart)
{
// Set MousePressed flag to true at start of line drawing.
f_bMousePressed = true;
// Allocate temp working LineGraphic object.
f_lgWorking = new LineGraphic();
// Add starting point to temp object.
f_lgWorking.AddPoint(ptStart);
}
/* -------------------------------- PRIVATE UTILITY METHODS --------------------------------- */
// Initialize Scratch Pad.
private void InitScratchPad(Color clrCurrent, int nCurrentLineWidth)
{
// Allocate collection of LineGraphic objects.
f_collLineGraphics = new List<LineGraphic>();
// Temp working LineGraphic initially set to null.
f_lgWorking = null;
// MousePressed flag set to false (not pressed to start.)
f_bMousePressed = false;
// Allocate Pen object.
f_penLine = new Pen(Color.Black);
// Set current line color & width for future lines drawn.
CurrentLineColor = clrCurrent;
CurrentLineWidth = nCurrentLineWidth;
// Set both start & end caps for line segments to rounded ends.
f_penLine.StartCap = LineCap.Round;
f_penLine.EndCap = LineCap.Round;
}
// End line stroke procedure.
public void EndLineDraw()
{
if ((f_bMousePressed == true) && (f_lgWorking != null))
{
// Store line color & width when object is committed.
f_lgWorking.LineColor = CurrentLineColor;
f_lgWorking.LineWidth = CurrentLineWidth;
// Add Temp LineGraphic to LineGraphics collection.
f_collLineGraphics.Add(f_lgWorking);
// null temp object.
f_lgWorking = null;
// Reset MousePressed flag.
f_bMousePressed = false;
}
}