/**
* Create the ImagePlot. If this is the first time the plot has been created the compute the
* appropriate zoom, otherwise using the zoom level in the PlotState object. Using the FitsRead in
* the PlotData object. Record the zoom level in the PlotData object.
*
* @param state plot state
* @param frGroup fits read group
* @param plotDesc plot description
* @return the image plot object
* @throws nom.tam.fits.FitsException if creating plot fails
*/
static ImagePlot createImagePlot(
PlotState state,
ActiveFitsReadGroup frGroup,
Band band,
String plotDesc,
ZoomChoice zoomChoice,
boolean isMultiImage)
throws FitsException {
RangeValues rv = state.getPrimaryRangeValues();
if (rv == null) {
rv = FitsRead.getDefaultFutureStretch();
state.setRangeValues(rv, state.firstBand());
}
float zoomLevel = zoomChoice.getZoomLevel();
ImagePlot plot =
PlotServUtils.makeImagePlot(
frGroup, zoomLevel, state.isThreeColor(), band, state.getColorTableId(), rv);
if (state.isNewPlot()) { // new plot requires computing the zoom level
zoomLevel = computeZoomLevel(plot, zoomChoice);
plot.getPlotGroup().setZoomTo(zoomLevel);
state.setZoomLevel(zoomLevel);
}
state.setZoomLevel(zoomLevel);
initPlotTitle(state, plot, frGroup, plotDesc, isMultiImage);
return plot;
}
static float computeZoomLevel(ImagePlot plot, ZoomChoice zoomChoice) {
int width = plot.getImageDataWidth();
int height = plot.getImageDataHeight();
float retval = zoomChoice.getZoomLevel();
if (zoomChoice.isSmartZoom()) {
retval = computeSmartZoom(width, height, zoomChoice.getZoomType());
} else if (zoomChoice.getZoomType() == ZoomType.TO_WIDTH) {
retval = (float) zoomChoice.getWidth() / (float) width;
if (zoomChoice.hasMaxZoomLevel()) {
if (retval > zoomChoice.getMaxZoomLevel()) retval = zoomChoice.getMaxZoomLevel();
}
} else if (zoomChoice.getZoomType() == ZoomType.FULL_SCREEN) {
retval =
VisUtil.getEstimatedFullZoomFactor(
VisUtil.FullType.WIDTH_HEIGHT,
width,
height,
zoomChoice.getWidth(),
zoomChoice.getHeight());
if (zoomChoice.hasMaxZoomLevel()) {
if (retval > zoomChoice.getMaxZoomLevel()) retval = zoomChoice.getMaxZoomLevel();
}
} else if (zoomChoice.getZoomType() == ZoomType.ARCSEC_PER_SCREEN_PIX) {
retval = (float) plot.getPixelScale() / zoomChoice.getArcsecPerScreenPix();
}
return retval;
}