public void DrawSignals(SharpGPS.NMEA.GPGSV gpgsv, SharpGPS.NMEA.GPGSA gpgsa)
{
//Generate signal level readout
int SatCount = gpgsv.SatsInView;
Bitmap imgSignals = new Bitmap(picGSVSignals.Width, picGSVSignals.Height);
using (Graphics g = Graphics.FromImage(imgSignals))
{
g.Clear(Color.White);
Pen penBlack = new Pen(Color.Black, 1);
Pen penGray = new Pen(Color.LightGray, 1);
int iMargin = 4; //Distance to edge of image
int iPadding = 4; //Distance between signal bars
g.DrawRectangle(penBlack, 0, 0, imgSignals.Width - 1, imgSignals.Height - 1);
StringFormat sFormat = new StringFormat();
int barWidth = 1;
if (SatCount > 0)
{
barWidth = (imgSignals.Width - 2 * iMargin - iPadding * (SatCount - 1)) / SatCount;
}
//Draw horisontal lines
for (int i = imgSignals.Height - 15; i > iMargin; i -= (imgSignals.Height - 15 - iMargin) / 5)
{
g.DrawLine(penGray, 1, i, imgSignals.Width - 2, i);
}
sFormat.Alignment = StringAlignment.Center;
//Draw satellites
for (int i = 0; i < SatCount; i++)
{
SharpGPS.NMEA.GPGSV.Satellite sat = gpgsv.Satellites[i];
int startx = i * (barWidth + iPadding) + iMargin;
int starty = imgSignals.Height - 15;
int height = (imgSignals.Height - 15 - iMargin) / 50 * sat.SNR;
g.FillRectangle(new System.Drawing.SolidBrush(Colors[i]), startx, starty - height, barWidth, height + 1);
if (gpgsa.PRNInSolution.Contains(sat.PRN))
{
g.DrawRectangle(penBlack, startx, starty - height, barWidth, height);
}
sFormat.LineAlignment = StringAlignment.Near;
g.DrawString(sat.PRN, new Font("Verdana", 9, FontStyle.Regular), new System.Drawing.SolidBrush(Color.Black), startx + barWidth / 2, imgSignals.Height - 15, sFormat);
sFormat.LineAlignment = StringAlignment.Far;
g.DrawString(sat.SNR.ToString(), new Font("Verdana", 9, FontStyle.Regular), new System.Drawing.SolidBrush(Color.Black), startx + barWidth / 2, starty - height, sFormat);
}
}
picGSVSignals.Image = imgSignals;
}
public void DrawGSV(SharpGPS.NMEA.GPGSV gpgsv, SharpGPS.NMEA.GPGSA gpgsa)
{
Pen penBlack = new Pen(Color.Black, 1);
Pen penGray = new Pen(Color.LightGray, 1);
int iMargin = 4; //Distance to edge of image
StringFormat sFormat = new StringFormat();
//Generate sky view
Bitmap imgSkyview = new Bitmap(picGSVSkyview.Width, picGSVSkyview.Height);
using (Graphics g = Graphics.FromImage(imgSkyview))
{
g.Clear(Color.Transparent);
g.FillEllipse(Brushes.White, 0, 0, imgSkyview.Width - 1, imgSkyview.Height - 1);
g.DrawEllipse(penGray, 0, 0, imgSkyview.Width - 1, imgSkyview.Height - 1);
g.DrawEllipse(penGray, imgSkyview.Width / 4, imgSkyview.Height / 4, imgSkyview.Width / 2, imgSkyview.Height / 2);
g.DrawLine(penGray, imgSkyview.Width / 2, 0, imgSkyview.Width / 2, imgSkyview.Height);
g.DrawLine(penGray, 0, imgSkyview.Height / 2, imgSkyview.Width, imgSkyview.Height / 2);
sFormat.LineAlignment = StringAlignment.Near;
sFormat.Alignment = StringAlignment.Near;
float radius = 6f;
for (int i = 0; i < gpgsv.Satellites.Count; i++)
{
SharpGPS.NMEA.GPGSV.Satellite sat = gpgsv.Satellites[i];
double ang = 90.0 - sat.Azimuth;
ang = ang / 180.0 * Math.PI;
int x = imgSkyview.Width / 2 + (int)Math.Round((Math.Cos(ang) * ((90.0 - sat.Elevation) / 90.0) * (imgSkyview.Width / 2.0 - iMargin)));
int y = imgSkyview.Height / 2 - (int)Math.Round((Math.Sin(ang) * ((90.0 - sat.Elevation) / 90.0) * (imgSkyview.Height / 2.0 - iMargin)));
g.FillEllipse(new System.Drawing.SolidBrush(Colors[i]), x - radius * 0.5f, y - radius * 0.5f, radius, radius);
if (gpgsa.PRNInSolution.Contains(sat.PRN))
{
g.DrawEllipse(penBlack, x - radius * 0.5f, y - radius * 0.5f, radius, radius);
g.DrawString(sat.PRN, new Font("Verdana", 9, FontStyle.Bold), new System.Drawing.SolidBrush(Color.Black), x, y, sFormat);
}
else
{
g.DrawString(sat.PRN, new Font("Verdana", 8, FontStyle.Italic), new System.Drawing.SolidBrush(Color.Gray), x, y, sFormat);
}
}
}
picGSVSkyview.Image = imgSkyview;
}