public void Draw(Graphics G, Viewing V, Pen P)
{
int XA, XB, YA, YB;
for (int i = 0; i < Pts.Count - 1; i++)
{
_3D Pt1 = (_3D)Pts[i];
_3D Pt2 = (_3D)Pts[i + 1];
XA = (int)(((Pt1.x - V.WorldCenX) * V.WorldtoScreen) + (V.ScreenWidth / 2));
YA = (int)(((V.WorldCenY - Pt1.y) * V.WorldtoScreen) + (V.ScreenHeight / 2));
XB = (int)(((Pt2.x - V.WorldCenX) * V.WorldtoScreen) + (V.ScreenWidth / 2));
YB = (int)(((V.WorldCenY - Pt2.y) * V.WorldtoScreen) + (V.ScreenHeight / 2));
G.DrawLine(P, XA, YA, XB, YB);
}
// draw this segment if the polyline is closed
if (IsClosed == true)
{
_3D Pt1 = (_3D)Pts[0];
_3D Pt2 = (_3D)Pts[Pts.Count - 1];
XA = (int)(((Pt1.x - V.WorldCenX) * V.WorldtoScreen) + (V.ScreenWidth / 2));
YA = (int)(((V.WorldCenY - Pt1.y) * V.WorldtoScreen) + (V.ScreenHeight / 2));
XB = (int)(((Pt2.x - V.WorldCenX) * V.WorldtoScreen) + (V.ScreenWidth / 2));
YB = (int)(((V.WorldCenY - Pt2.y) * V.WorldtoScreen) + (V.ScreenHeight / 2));
G.DrawLine(P, XA, YA, XB, YB);
}
}
public string ReadFromDXF(StreamReader str, ListBox lb)
{
string GroupCode, Value;
GroupCode = "Unused";
Value = "Unassigned";
lb.Items.Add("POLYLINE");
while (GroupCode != "0")
{
// get the next code/value pair
GroupCode = str.ReadLine().Trim();
Value = str.ReadLine().Trim();
if (GroupCode == "70") // Closed or not
{
if (Value == "0")
{
IsClosed = false;
}
else if (Value == "1")
{
IsClosed = true;
}
}
if (GroupCode == "10")
{
// create a new 3D point, and then the x-ordinate of it
_3D Pt = new _3D();
Pt.x = Convert.ToDouble(Value);
// the next group code is 20, which is followed by the y-ordinate of the point
GroupCode = str.ReadLine().Trim();
Value = str.ReadLine().Trim();
Pt.y = Convert.ToDouble(Value);
lb.Items.Add(Pt.Publish());
Pts.Add(Pt);
}
}
SetExtents();
// this is the name of the next object to follow
// it is the value when we get a group code of 0, thus exiting the while loop
return(Value);
}
public void SetExtents()
{
/* this method calculates the size of the 'box' to enclose the ellipse
* it will then be used by the DrawingSet class to calculate the extents of all the
* drawing objects as a unit, when arriving at values in the Viewing class, when displaying
* the objects after they have been loaded from the file
*/
for (int i = 0; i < Pts.Count; i++)
{
_3D Pt = (_3D)Pts[i];
if (i == 0)
{
LeftX = Pt.x;
RightX = Pt.x;
TopY = Pt.y;
BottomY = Pt.y;
}
else
{
if (Pt.x < LeftX)
{
LeftX = Pt.x;
}
if (Pt.x > RightX)
{
RightX = Pt.x;
}
if (Pt.y > TopY)
{
TopY = Pt.y;
}
if (Pt.y < BottomY)
{
BottomY = Pt.y;
}
}
}
}
