private void Interp(Graphics g, PointF[] pta, float[] cData, int npoints)
{
PointC[,] pts = new PointC[npoints + 1, npoints + 1];
float x0 = pta[0].X;
float x1 = pta[3].X;
float y0 = pta[0].Y;
float y1 = pta[1].Y;
float dx = (x1 - x0) / npoints;
float dy = (y1 - y0) / npoints;
float C00 = cData[0];
float C10 = cData[1];
float C11 = cData[2];
float C01 = cData[3];
for (int i = 0; i <= npoints; i++)
{
float x = x0 + i * dx;
for (int j = 0; j <= npoints; j++)
{
float y = y0 + j * dy;
float C = (y1 - y) * ((x1 - x) * C00 +
(x - x0) * C10) / (x1 - x0) / (y1 - y0) +
(y - y0) * ((x1 - x) * C01 +
(x - x0) * C11) / (x1 - x0) / (y1 - y0);
pts[j, i] = new PointC(new PointF(x, y), C);
}
}
//Create a new colour mapping
ColorMap cm = new ColorMap();
int[,] cmap = cm.Jet();
float cmin = 0; float cmax = 255;
int colorLength = cmap.GetLength(0);
for (int i = 0; i <= npoints; i++)
{
for (int j = 0; j <= npoints; j++)
{
int cindex = (int)Math.Round((colorLength * (pts[i, j].C - cmin) +
(cmax - pts[i, j].C)) / (cmax - cmin));
if (cindex < 1)
{
cindex = 1;
}
if (cindex > colorLength)
{
cindex = colorLength;
}
for (int k = 0; k < 4; k++)
{
pts[j, i].ARGBArray[k] = cmap[cindex - 1, k];
}
}
}
//Draw the points
for (int i = 0; i < npoints; i++)
{
for (int j = 0; j < npoints; j++)
{
SolidBrush aBrush = new SolidBrush(Color.FromArgb(pts[i, j].ARGBArray[0],
pts[i, j].ARGBArray[1], pts[i, j].ARGBArray[2], pts[i, j].ARGBArray[3]));
PointF[] points = new PointF[4] {
pts[i, j].pointf, pts[i + 1, j].pointf,
pts[i + 1, j + 1].pointf, pts[i, j + 1].pointf
};
g.FillPolygon(aBrush, points);
aBrush.Dispose();
}
}
}
private void CreateThermalImage(Graphics g)
{
ColorMap cm = new ColorMap();
Random rand = new Random();
int[,] cmap = cm.Jet();
int x0 = 10, y0 = 10;
int width = 30, height = 30;
PointC[,] pts = new PointC[8, 8];
int p = 0;
float minTemp = pixelValues.Min();
float maxTemp = pixelValues.Max();
pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
pictureBox1.Location = new System.Drawing.Point(0, 0);
//Remap float values to uint8 range 0-255
for (int i = 0; i < 64; i++)
{
pixelValues[i] = RemapFloatToInt(pixelValues[i], minTemp, maxTemp, 0, 255);
}
//Create new points used for interpolation
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
pts[i, j] = new PointC(new PointF(x0 + width * j, y0 + height * i), pixelValues[p]);
p += 1;
}
}
float cmin = 0;
float cmax = 255;
int colorLength = cmap.GetLength(0);
// Create original pixelated color image using colour mapping in cmap
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
int cindex = (int)Math.Round((colorLength * (pts[i, j].C - cmin) +
(cmax - pts[i, j].C)) / (cmax - cmin));
if (cindex < 1)
{
cindex = 1;
}
if (cindex > colorLength)
{
cindex = colorLength;
}
for (int k = 0; k < 4; k++)
{
pts[i, j].ARGBArray[k] = cmap[cindex - 1, k];
}
}
}
//Create points used for drawing image
p = 0;
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
pts[i, j] = new PointC(new PointF(x0 + width * j, y0 + height * i), pixelValues[p]);
p += 1;
}
}
//Draw new interpolated image using the pixelated colour image create above
for (int i = 0; i < 7; i++)
{
for (int j = 0; j < 7; j++)
{
PointF[] pta = new PointF[4] {
pts[i, j].pointf, pts[i + 1, j].pointf,
pts[i + 1, j + 1].pointf, pts[i, j + 1].pointf
};
float[] cdata = new float[4] {
pts[i, j].C, pts[i + 1, j].C,
pts[i + 1, j + 1].C, pts[i, j + 1].C
};
Interp(g, pta, cdata, 50);
}
}
}
