boolean setThresholdLevels(ImagePlus imp, ImageProcessor ip) {
double t1 = ip.getMinThreshold();
double t2 = ip.getMaxThreshold();
boolean invertedLut = imp.isInvertedLut();
boolean byteImage = ip instanceof ByteProcessor;
if (ip instanceof ShortProcessor) imageType = SHORT;
else if (ip instanceof FloatProcessor) imageType = FLOAT;
else imageType = BYTE;
if (t1 == ImageProcessor.NO_THRESHOLD) {
ImageStatistics stats = imp.getStatistics();
if (imageType != BYTE || (stats.histogram[0] + stats.histogram[255] != stats.pixelCount)) {
IJ.error(
"Particle Analyzer",
"A thresholded image or 8-bit binary image is\n"
+ "required. Threshold levels can be set using\n"
+ "the Image->Adjust->Threshold tool.");
canceled = true;
return false;
}
boolean threshold255 = invertedLut;
if (Prefs.blackBackground) threshold255 = !threshold255;
if (threshold255) {
level1 = 255;
level2 = 255;
fillColor = 64;
} else {
level1 = 0;
level2 = 0;
fillColor = 192;
}
} else {
level1 = t1;
level2 = t2;
if (imageType == BYTE) {
if (level1 > 0) fillColor = 0;
else if (level2 < 255) fillColor = 255;
} else if (imageType == SHORT) {
if (level1 > 0) fillColor = 0;
else if (level2 < 65535) fillColor = 65535;
} else if (imageType == FLOAT) fillColor = -Float.MAX_VALUE;
else return false;
}
imageType2 = imageType;
if (redirectIP != null) {
if (redirectIP instanceof ShortProcessor) imageType2 = SHORT;
else if (redirectIP instanceof FloatProcessor) imageType2 = FLOAT;
else if (redirectIP instanceof ColorProcessor) imageType2 = RGB;
else imageType2 = BYTE;
}
return true;
}
void createEllipse(ImagePlus imp) {
IJ.showStatus("Fitting ellipse");
Roi roi = imp.getRoi();
if (roi == null) {
IJ.error("Fit Ellipse", "Selection required");
return;
}
if (roi.isLine()) {
IJ.error("Fit Ellipse", "\"Fit Ellipse\" does not work with line selections");
return;
}
ImageStatistics stats = imp.getStatistics(Measurements.CENTROID + Measurements.ELLIPSE);
double dx = stats.major * Math.cos(stats.angle / 180.0 * Math.PI) / 2.0;
double dy = -stats.major * Math.sin(stats.angle / 180.0 * Math.PI) / 2.0;
double x1 = stats.xCentroid - dx;
double x2 = stats.xCentroid + dx;
double y1 = stats.yCentroid - dy;
double y2 = stats.yCentroid + dy;
double aspectRatio = stats.minor / stats.major;
imp.killRoi();
imp.setRoi(new EllipseRoi(x1, y1, x2, y2, aspectRatio));
}