void DrawObjects(Graphics g)
{
var cm = new ColorMap();
int[,] cmap = cm.Jet();
int x0 = 10;
int y0 = 10;
int width = 85;
int height = 85;
PointC[,] pts = new PointC[3, 3];
pts[0, 0] = new PointC(new Point(x0, y0), 3);
pts[0, 1] = new PointC(new Point(x0 + width, y0), 0);
pts[0, 2] = new PointC(new Point(x0 + 2 * width, y0), 4);
pts[1, 0] = new PointC(new Point(x0, y0 + height), -2);
pts[1, 1] = new PointC(new Point(x0 + width, y0 + height), 3);
pts[1, 2] = new PointC(new Point(x0 + 2 * width, y0 + height), 1);
pts[2, 0] = new PointC(new Point(x0, y0 + 2 * height), -1);
pts[2, 1] = new PointC(new Point(x0 + width, y0 + 2 * height), 2);
pts[2, 2] = new PointC(new Point(x0 + 2 * width, y0 + 2 * height), -3);
float cmin = -3;
float cmax = 4;
int colorLength = cmap.GetLength(0);
// Original color map:
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
var 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];
}
}
}
for (int i = 0; i < 2; i++)
{
for (int j = 0; j < 2; j++)
{
var 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[] pta =
{
pts[i, j].pointf, pts[i + 1, j].pointf, pts[i + 1, j + 1].pointf, pts[i, j + 1].pointf
};
g.FillPolygon(aBrush, pta);
aBrush.Dispose();
}
}
g.DrawString("Direct Color Map", Font, Brushes.Black, 50, 190);
// Bilinear interpolation:
x0 = x0 + 200;
pts[0, 0] = new PointC(new Point(x0, y0), 3);
pts[0, 1] = new PointC(new Point(x0 + width, y0), 0);
pts[0, 2] = new PointC(new Point(x0 + 2 * width, y0), 4);
pts[1, 0] = new PointC(new Point(x0, y0 + height), -2);
pts[1, 1] = new PointC(new Point(x0 + width, y0 + height), 3);
pts[1, 2] = new PointC(new Point(x0 + 2 * width, y0 + height), 1);
pts[2, 0] = new PointC(new Point(x0, y0 + 2 * height), -1);
pts[2, 1] = new PointC(new Point(x0 + width, y0 + 2 * height), 2);
pts[2, 2] = new PointC(new Point(x0 + 2 * width, y0 + 2 * height), -3);
for (int i = 0; i < 2; i++)
{
for (int j = 0; j < 2; j++)
{
PointF[] pta =
{
pts[i, j].pointf, pts[i + 1, j].pointf, pts[i + 1, j + 1].pointf, pts[i, j + 1].pointf
};
float[] cdata = { 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);
}
}
g.DrawString("Interpolated Color Map", Font, Brushes.Black, 240, 190);
}
void DrawObjects(Graphics g)
{
var cm = new ColorMap ();
int[,] cmap = cm.Jet ();
int x0 = 10;
int y0 = 10;
int width = 85;
int height = 85;
PointC[,] pts = new PointC[3, 3];
pts[0, 0] = new PointC (new Point (x0, y0), 3);
pts[0, 1] = new PointC (new Point (x0 + width, y0), 0);
pts[0, 2] = new PointC (new Point (x0 + 2 * width, y0), 4);
pts[1, 0] = new PointC (new Point (x0, y0 + height), -2);
pts[1, 1] = new PointC (new Point (x0 + width, y0 + height), 3);
pts[1, 2] = new PointC (new Point (x0 + 2 * width, y0 + height), 1);
pts[2, 0] = new PointC (new Point (x0, y0 + 2* height), -1);
pts[2, 1] = new PointC (new Point (x0 + width, y0 + 2* height), 2);
pts[2, 2] = new PointC (new Point (x0 + 2 * width, y0 + 2 * height), -3);
float cmin = -3;
float cmax = 4;
int colorLength = cmap.GetLength (0);
// Original color map:
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
var 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];
}
}
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
var 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[] pta = {
pts[i,j].pointf, pts[i+1,j].pointf, pts[i+1,j+1].pointf, pts[i,j+1].pointf
};
g.FillPolygon (aBrush, pta);
aBrush.Dispose ();
}
}
g.DrawString ("Direct Color Map", Font, Brushes.Black, 50, 190);
// Bilinear interpolation:
x0 = x0 + 200;
pts[0, 0] = new PointC (new Point (x0, y0), 3);
pts[0, 1] = new PointC (new Point (x0 + width, y0), 0);
pts[0, 2] = new PointC (new Point (x0 + 2 * width, y0), 4);
pts[1, 0] = new PointC (new Point (x0, y0 + height), -2);
pts[1, 1] = new PointC (new Point (x0 + width, y0 + height), 3);
pts[1, 2] = new PointC (new Point (x0 + 2 * width, y0 + height), 1);
pts[2, 0] = new PointC (new Point (x0, y0 + 2 * height), -1);
pts[2, 1] = new PointC (new Point (x0 + width, y0 + 2 * height), 2);
pts[2, 2] = new PointC (new Point (x0 + 2 * width, y0 + 2 * height), -3);
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
PointF[] pta = {
pts[i,j].pointf, pts[i+1,j].pointf, pts[i+1,j+1].pointf, pts[i,j+1].pointf
};
float[] cdata = { 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);
}
}
g.DrawString("Interpolated Color Map", Font, Brushes.Black, 240, 190);
}
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);
}
}
var cm = new ColorMap();
int[,] cmap = cm.Jet();
float cmin = -3;
float cmax = 4;
int colorLength = cmap.GetLength(0);
for (int i = 0; i <= npoints; i++)
{
for (int j = 0; j <= npoints; j++)
{
var 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];
}
}
}
for (int i = 0; i < npoints; i++)
{
for (int j = 0; j < npoints; j++)
{
var 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 =
{
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();
}
}
}
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);
}
}
var cm = new ColorMap ();
int[,] cmap = cm.Jet();
float cmin = -3;
float cmax = 4;
int colorLength = cmap.GetLength (0);
for (int i = 0; i <= npoints; i++) {
for (int j = 0; j <= npoints; j++) {
var 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];
}
}
for (int i = 0; i < npoints; i++) {
for (int j = 0; j < npoints; j++) {
var 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 = {
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 ();
}
}
}