bool GetArrowHead(On2dVector dir, On2dPoint tip, double scale, ref On3dPointArray triangle)
{
double arrow_size = m_default_arrow_size * scale;
On2dPointArray corners = new On2dPointArray();
corners.Reserve(3);
corners.SetCount(3);
On2dVector up = new On2dVector(-dir.y, dir.x);
corners[0].Set(tip.x, tip.y);
corners[1].x = tip.x + arrow_size * (0.25 * up.x - dir.x);
corners[1].y = tip.y + arrow_size * (0.25 * up.y - dir.y);
corners[2].x = corners[1].x - 0.5 * arrow_size * up.x;
corners[2].y = corners[1].y - 0.5 * arrow_size * up.y;
triangle.Reserve(corners.Count());
triangle.SetCount(corners.Count());
for (int i = 0; i < corners.Count(); i++)
{
triangle[i] = m_plane.PointAt(corners[i].x, corners[i].y);
}
return(true);
}
/// <summary>
/// Public constructor
/// </summary>
public SampleCsDrawArrowheadConduit(OnPlane plane, OnLine line, double scale)
: base(new MSupportChannels(MSupportChannels.SC_CALCBOUNDINGBOX | MSupportChannels.SC_DRAWOVERLAY), false)
{
m_bDraw = false;
m_plane = plane;
m_line = line;
m_arrowhead = new On3dPointArray();
double x = 0, y = 0;
m_plane.ClosestPointTo(line.from, ref x, ref y);
On2dPoint from = new On2dPoint(x, y);
m_plane.ClosestPointTo(line.to, ref x, ref y);
On2dPoint to = new On2dPoint(x, y);
On2dVector dir = new On2dVector(from - to);
dir.Unitize();
m_bDraw = GetArrowHead(dir, from, scale, ref m_arrowhead);
}
bool GetArrowHead(On2dVector dir, On2dPoint tip, double scale, ref On3dPointArray triangle)
{
double arrow_size = m_default_arrow_size * scale;
On2dPointArray corners = new On2dPointArray();
corners.Reserve(3);
corners.SetCount(3);
On2dVector up = new On2dVector(-dir.y, dir.x);
corners[0].Set(tip.x, tip.y);
corners[1].x = tip.x + arrow_size * (0.25 * up.x - dir.x);
corners[1].y = tip.y + arrow_size * (0.25 * up.y - dir.y);
corners[2].x = corners[1].x - 0.5 * arrow_size * up.x;
corners[2].y = corners[1].y - 0.5 * arrow_size * up.y;
triangle.Reserve(corners.Count());
triangle.SetCount(corners.Count());
for (int i = 0; i < corners.Count(); i++)
triangle[i] = m_plane.PointAt(corners[i].x, corners[i].y);
return true;
}
/// <summary>
/// Public constructor
/// </summary>
public SampleCsDrawArrowheadConduit(OnPlane plane, OnLine line, double scale)
: base(new MSupportChannels(MSupportChannels.SC_CALCBOUNDINGBOX | MSupportChannels.SC_DRAWOVERLAY), false)
{
m_bDraw = false;
m_plane = plane;
m_line = line;
m_arrowhead = new On3dPointArray();
double x = 0, y = 0;
m_plane.ClosestPointTo(line.from, ref x, ref y);
On2dPoint from = new On2dPoint(x, y);
m_plane.ClosestPointTo(line.to, ref x, ref y);
On2dPoint to = new On2dPoint(x, y);
On2dVector dir = new On2dVector(from - to);
dir.Unitize();
m_bDraw = GetArrowHead(dir, from, scale, ref m_arrowhead);
}
