private void CreateTransformationMatrix(double wxmin, double wxmax, double wymin, double wymax, double dxmin, double dxmax, double dymin, double dymax)
{
// Make WtoD.
WtoDMatrix = Matrix.Identity;
WtoDMatrix.Translate(-wxmin, -wymin);
double xscale = (dxmax - dxmin) / (wxmax - wxmin);
double yscale = (dymax - dymin) / (wymax - wymin);
WtoDMatrix.Scale(xscale, yscale);
WtoDMatrix.Translate(dxmin, dymin);
// Make DtoW.
DtoWMatrix = WtoDMatrix;
DtoWMatrix.Invert();
}
private void PrepareTransformations(double minWx, double maxWx, double minWy, double maxWy, double minDx,
double maxDx, double maxDy, double minDy)
{
// Make WtoD matrix
WtoDMatrix = Matrix.Identity;
WtoDMatrix.Translate(-minWx, -minWy);
double scaleX = (maxDx - minDx) / (maxWx - minWx);
double scaleY = (maxDy - minDy) / (maxWy - minWy);
WtoDMatrix.Scale(scaleX, scaleY);
WtoDMatrix.Translate(minDx, minDy);
// Make DtoW matrix
DtoWMatrix = WtoDMatrix;
DtoWMatrix.Invert();
}
public static void PrepareTransformations(
double wxmin, double wxmax, double wymin, double wymax,
double dxmin, double dxmax, double dymax, double dymin)
{
// Make WtoD.
WtoDMatrix = Matrix.Identity;
WtoDMatrix.Translate(-wxmin, -wymin);
double xscale = (dxmax - dxmin) / (wxmax - wxmin);
double yscale = (dymax - dymin) / (wymax - wymin);
WtoDMatrix.Scale(xscale, yscale);
WtoDMatrix.Translate(dxmin, dymin);
// Make DtoW.
DtoWMatrix = WtoDMatrix;
DtoWMatrix.Invert();
}
// Prepare values for perform transformations.
private void PrepareTransformations()
{
// Make WtoD.
WtoDMatrix = Matrix.Identity;
WtoDMatrix.Translate(-World.Xmin, -World.Ymin);
try //make sure we don't divide by zero
{
double xscale = Device.Xmax / (World.Xmax - World.Xmin);
double yscale = Device.Ymax / (World.Ymax - World.Ymin);
WtoDMatrix.Scale(xscale, yscale);
WtoDMatrix.Translate(Device.Xmin, Device.Ymin);
}
catch { }
// Make DtoW.
DtoWMatrix = WtoDMatrix;
try
{
DtoWMatrix.Invert();
}
catch { }
}
private void DrawGraph()
{
//}
//txtStartDate.Invalidate();
int wid = GrphPlace.ClientSize.Width;
int hgt = GrphPlace.ClientSize.Height;
GraphBm = new Bitmap(wid, hgt);
using (Graphics gr = Graphics.FromImage(GraphBm))
{
gr.SmoothingMode = SmoothingMode.AntiAlias;
gr.Clear(Color.White);
// Scale the data to fit.
int num_points = Tmprr.Count;
float min_price = (float)Tmprr.Min(data => data.Price);
float max_price = (float)Tmprr.Max(data => data.Price);
const int margin = 10;
WtoDMatrix = MappingMatrix(
0, num_points - 1, min_price, max_price,
margin, wid - margin, margin, hgt - margin);
gr.Transform = WtoDMatrix;
DtoWMatrix = WtoDMatrix.Clone();
DtoWMatrix.Invert();
// Draw the graph.
using (Pen pen = new Pen(Color.Black, 0))
{
// Draw tic marks.
PointF[] pts = { new PointF(10, 10) };
DtoWMatrix.TransformVectors(pts);
float dy = pts[0].Y;
float dx = pts[0].X;
for (int x = 0; x < Tmprr.Count; x++)
{
gr.DrawLine(pen, x, min_price, x, min_price + dy);
}
for (int y = (int)min_price; y <= (int)max_price; y++)
{
gr.DrawLine(pen, 0, y, dx, y);
}
// Get a small distance in world coordinates.
dx = Math.Abs(dx / 5);
dy = Math.Abs(dy / 5);
// Draw the data.
PointF[] points = new PointF[num_points];
for (int i = 0; i < num_points; i++)
{
float price = (float)Tmprr[i].Price;
points[i] = new PointF(i, price);
gr.FillRectangle(Brushes.Red,
i - dx, price - dy, 2 * dx, 2 * dy);
}
pen.Color = Color.Blue;
gr.DrawLines(pen, points);
}
}
// Display the result.
GrphPlace.Image = GraphBm;
}
