/// <summary>
/// Points of each data in screen coordinate
/// </summary>
/// <param name="pane"></param>
/// <returns></returns>
virtual public PointF[] ScreenPoints(PaneBase pane)
{
//PointF[] points = new PointF[4];
//points[0] = _location.TransformTopLeft(pane);
//points[2] = _location.TransformBottomRight(pane);
//points[1].X = points[2].X;
//points[1].Y = points[0].Y;
//points[3].X = points[0].X;
//points[3].Y = points[2].Y;
PointF[] points = new PointF[4];
points[0] = _location.TransformTopLeft(pane);
points[1] = _location.TransformBottomRight(pane);
return(points);
}
/// <summary>
/// Render this object to the specified <see cref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see cref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
public override void Draw(Graphics g, PaneBase pane, float scaleFactor)
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft(pane);
PointF pix2 = Location.TransformBottomRight(pane);
if (pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000)
{
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2(dy, dx) * 180.0F / (float)Math.PI;
var length = (float)Math.Sqrt(dx * dx + dy * dy);
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform(pix1.X, pix1.Y);
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform(angle);
// get a pen according to this arrow properties
using (var pen = new Pen(_color, pane.ScaledPenWidth(_penWidth, scaleFactor)))
{
pen.DashStyle = _style;
g.DrawLine(pen, 0, 0, length, 0);
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}
/// <summary>
/// Render this object to the specified <see cref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see cref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
public override void Draw(Graphics g, PaneBase pane, float scaleFactor)
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft(pane);
PointF pix2 = Location.TransformBottomRight(pane);
if (pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000)
{
// get a scaled size for the arrowhead
float scaledSize = (_size * scaleFactor);
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2(dy, dx) * 180.0F / (float)Math.PI;
var length = (float)Math.Sqrt(dx * dx + dy * dy);
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform(pix1.X, pix1.Y);
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform(angle);
// get a pen according to this arrow properties
using (var pen = new Pen(_color, pane.ScaledPenWidth(_penWidth, scaleFactor)))
{
pen.DashStyle = _style;
// Only show the arrowhead if required
if (_isArrowHead)
{
// Draw the line segment for this arrow
g.DrawLine(pen, 0, 0, length - scaledSize + 1, 0);
// Create a polygon representing the arrowhead based on the scaled
// size
var polyPt = new PointF[4];
float hsize = scaledSize / 3.0F;
polyPt[0].X = length;
polyPt[0].Y = 0;
polyPt[1].X = length - scaledSize;
polyPt[1].Y = hsize;
polyPt[2].X = length - scaledSize;
polyPt[2].Y = -hsize;
polyPt[3] = polyPt[0];
using (var brush = new SolidBrush(_color))
// render the arrowhead
g.FillPolygon(brush, polyPt);
}
else
{
g.DrawLine(pen, 0, 0, length, 0);
}
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}
