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;
}
