/**
* Draw the image containing the dataset pixels.
*
* @param panel the panel containing this data raster
* @param g the graphics context upon which to draw
*/
public void draw(DrawingPanel panel, Graphics g) {
if (!visible) {
return;
}
if (primaryDrawingPanel != panel) {
return; // can only draw on one panel for now.
}
int xrange = panel.xToPix(xmax) - panel.xToPix(xmin);
int yrange = panel.yToPix(ymin) - panel.yToPix(ymax);
xrange = Math.min(xrange, panel.getWidth());
yrange = Math.min(yrange, panel.getHeight());
if ((xrange == 0) || (xrange == 0)) {
return;
}
// render a new image if the scale or image size change
if ((Math.abs(xrange) != image.getWidth())
|| // image size change
(Math.abs(yrange) != image.getHeight())
|| ( // image size change
xppu != primaryDrawingPanel.getXPixPerUnit())
|| ( // scale change
yppu != primaryDrawingPanel.getYPixPerUnit())) {
render();
}
double xmin = Math.max(primaryDrawingPanel.getXMin(), this.xmin);
double ymax = Math.min(primaryDrawingPanel.getYMax(), this.ymax);
if ((image != null) && (image.getWidth() > 1)) {
g.drawImage(
image, panel.xToPix(xmin), panel.yToPix(ymax), panel); // blast the image into the panel
}
}
/**
* Draws the rings for the polar plot.
*
* @param panel
* @param g
* @return double the ring separation used
*/
public double drawRings(double rmax, DrawingPanel panel, Graphics g) {
double dr = Math.max(this.dr, 1.0e-9);
if (autospaceRings) {
int exponent = (int) (Math.log(rmax) / LOG10);
double decade = Math.pow(10, exponent - 1);
dr = decade;
while (rmax / dr > 5 * MAJOR_TIC) { // increase dr if we have more than 25 rings
dr *= 2;
if (dr / decade > 3.5 && dr / decade < 4.5) {
dr = 5 * decade;
decade *= 10;
}
}
} else {
int nrings = (int) (rmax / dr);
while (nrings > 10 * MAJOR_TIC) {
dr *= 2;
nrings = (int) (rmax / dr);
}
}
int xcenter = panel.xToPix(0);
int ycenter = panel.yToPix(0);
int xrad = (int) (panel.getXPixPerUnit() * rmax);
int yrad = (int) (panel.getYPixPerUnit() * rmax);
if (interiorColor != null) {
g.setColor(interiorColor);
g.fillOval(xcenter - xrad, ycenter - yrad, 2 * xrad, 2 * yrad);
}
int counter = 0;
for (double r = 0; r <= rmax; r += dr) {
g.setColor(gridcolor);
xrad = panel.xToPix(r) - xcenter;
yrad = ycenter - panel.yToPix(r);
if (counter % MAJOR_TIC == 0) {
g.setColor(gridcolor.darker());
}
g.drawOval(xcenter - xrad, ycenter - yrad, 2 * xrad, 2 * yrad);
counter++;
}
return dr;
}