private bool checkLineProximity(int indexno, int identifier, Graphics daGe) //checks whether if the mouse pointer is on an object (i.e. shape)
{
Graphics g = daGe;
Pen lePen = new Pen(Color.Yellow, 1);
//g = this.CreateGraphics();
g.TranslateTransform(8, canvasHeight + 8); //transforms point-of-origin to the lower left corner of the canvas.
g.SmoothingMode = SmoothingMode.HighQuality;
switch (identifier) //depending on the "identifier" value, the relevant object will be highlighted
{
case 2: //Line
{
Line line = (Line)drawingList[indexno];
if (mainScale == 0)
{
mainScale = 1;
}
if (line.Highlight(lePen, g, aPoint, mainScale))
{
this.Cursor = Cursors.Hand;
line.highlighted = true;
return(true);
}
break;
}
case 3: //rectangle
{
rectangle rect = (rectangle)drawingList[indexno];
if (rect.Highlight(lePen, g, aPoint))
{
this.Cursor = Cursors.Hand;
rect.highlighted = true;
return(true);
}
break;
}
case 4: //circle
{
circle tempCircle = (circle)drawingList[indexno];
if (mainScale == 0)
{
mainScale = 1;
}
if (tempCircle.Highlight(lePen, g, aPoint, mainScale))
{
this.Cursor = Cursors.Hand;
tempCircle.highlighted = true;
return(true);
}
break;
}
case 5: //polyline
{
polyline tempPoly = (polyline)drawingList[indexno];
if (mainScale == 0)
{
mainScale = 1;
}
if (tempPoly.Highlight(lePen, g, aPoint, mainScale))
{
this.Cursor = Cursors.Hand;
tempPoly.highlighted = true;
return(true);
}
break;
}
case 6: //arc
{
Arc tempArc = (Arc)drawingList[indexno];
if (mainScale == 0)
{
mainScale = 1;
}
if (tempArc.Highlight(lePen, g, aPoint, mainScale))
{
this.Cursor = Cursors.Hand;
tempArc.highlighted = true;
return(true);
}
break;
}
}
return(false);
}
public void Draw(Graphics g)
{
//int xOffSet = 0;
Pen lePen = new Pen(Color.White, 3);
Size scrollOffset = new Size(this.AutoScrollPosition);
g.TranslateTransform(1 + scrollOffset.Width, canvasHeight - 1 + scrollOffset.Height);
if (YMin < 0)
{
g.TranslateTransform(0, -(int)Math.Abs(YMin)); //transforms point-of-origin to the lower left corner of the canvas.
}
if (XMin < 0)
{
g.TranslateTransform((int)Math.Abs(XMin), 0);
}
// g.SmoothingMode = SmoothingMode.AntiAlias;
showForks(g, lePen.Brush);
foreach (DrawingObject obj in objectIdentifier) //iterates through the objects
{
switch (obj.shapeType)
{
case 2: //line
{
Line temp = (Line)drawingList[obj.indexNo];
lePen.Color = temp.ContourColor;
lePen.Width = temp.LineWidth;
highlightedRegion.Location = temp.GetStartPoint;
highlightedRegion.Width = temp.GetStartPoint.X - temp.GetEndPoint.X;
highlightedRegion.Height = temp.GetStartPoint.Y - temp.GetEndPoint.Y;
int centerX = (temp.GetStartPoint.X + temp.GetEndPoint.X) / 2;
int centerY = (temp.GetStartPoint.Y + temp.GetEndPoint.Y) / 2;
if (mainScale == 0)
{
mainScale = 1;
}
temp.Draw(lePen, g, mainScale);
g.DrawString("L" + obj.indexNo, new Font("宋体", 10), lePen.Brush, centerX, centerY);
break;
}
case 3: //rectangle
{
rectangle temp = (rectangle)drawingList[obj.indexNo];
lePen.Color = temp.ContourColor;
lePen.Width = temp.LineWidth;
temp.Draw(lePen, g);
break;
}
case 4: //circle
{
circle temp = (circle)drawingList[obj.indexNo];
lePen.Color = temp.ContourColor;
lePen.Width = temp.LineWidth;
if (mainScale == 0)
{
mainScale = 1;
}
temp.Draw(lePen, g, mainScale);
break;
}
case 5: //polyline
{
polyline temp = (polyline)drawingList[obj.indexNo];
lePen.Color = temp.ContourColor;
lePen.Width = temp.LineWidth;
if (mainScale == 0)
{
mainScale = 1;
}
temp.Draw(lePen, g, mainScale);
break;
}
case 6: //arc
{
Arc temp = (Arc)drawingList[obj.indexNo];
lePen.Color = temp.ContourColor;
lePen.Width = temp.LineWidth;
if (mainScale == 0)
{
mainScale = 1;
}
temp.Draw(lePen, g, mainScale);
g.DrawString("A" + obj.indexNo, new Font("宋体", 10), lePen.Brush, temp.CenterPoint);
break;
}
}
}
// g.Dispose(); //not disposed because "g" is get from the paintbackground event..
lePen.Dispose();
}