private ArrayList<Integer> findMinMax(int beginFrame, int endFrame) {
// System.err.println(beginFrame + " " + endFrame);
// System.err.println(data);
ArrayList<Integer> minMax = new ArrayList<Integer>();
int length = endFrame - beginFrame + 1;
float maxValue = myHelper.getMaxSampleValue();
float max = (-1) * maxValue;
;
float min = maxValue;
for (int sampleIndex = beginFrame; sampleIndex < endFrame; sampleIndex++) {
int sampleValue = data.get(sampleIndex);
if (max < sampleValue) {
max = sampleValue;
}
if (min > sampleValue) {
min = sampleValue;
}
}
minMax.add((int) min);
minMax.add((int) max);
return minMax;
}
private ArrayList<SoundSample> getSampleAsArrayList(Selection selection, Component c) {
ArrayList<SoundSample> points = new ArrayList<SoundSample>();
// System.err.println(c.getHeight());
int sampleBeginIndex = selection.getBegin();
int sampleEndIndex = selection.getEnd();
if (!checkRange(sampleBeginIndex, sampleEndIndex)) {
System.err.println(
"The range of sample ("
+ sampleBeginIndex
+ " , "
+ sampleEndIndex
+ ") you are trying to visualize is invalid");
} else {
int selectionLength = sampleEndIndex - sampleBeginIndex + 1;
float maxValue = myHelper.getMaxSampleValue();
samplePerPixel = selectionLength * 1.0 / frameWidth;
if (DEBUG) System.err.println("getSamples: sample per pixel " + samplePerPixel);
if (selectionLength
< frameWidth) { // if every sample can be displayed (i.e at least 1 pixel per sample)
if (DEBUG) System.err.println("getSamples: Everything can be displayed " + selectionLength);
int ratio = (int) Math.floor(frameWidth / selectionLength);
if (DEBUG) System.err.println("getSamples: ratio " + ratio);
int occupyPixels = ratio * selectionLength;
selectionLength =
selectionLength
+ (frameWidth - occupyPixels)
/ ratio; // fill up the display space with a few more samples
if (DEBUG) System.err.println("getSamples: selection length " + selectionLength);
if (selectionLength + sampleBeginIndex - 1 > data.size()) {
selectionLength -= selectionLength + sampleBeginIndex - 1 - data.size();
}
if (DEBUG) System.err.println("getSamples: Final selection length " + selectionLength);
for (int i = 0; i < selectionLength; i++) {
float sampleValue = data.get(sampleBeginIndex + i - 1);
float y = ((float) Math.floor(c.getHeight() / 2) * (1 - sampleValue / maxValue));
points.add(
new SoundSample(new Point2D.Float(i * ratio, y), sampleValue, sampleBeginIndex + i));
}
} else if (selectionLength / 2 < frameWidth) { // we can sample at Nyquist rate
// System.err.println("Sample begin " + sampleBeginIndex );
int start = sampleBeginIndex;
for (int pixel = 0; pixel < frameWidth; pixel++) {
// System.err.println("Sample index " + (start+ samplePerPixel * pixel) );
int sampleValue = data.get((int) Math.floor(start + samplePerPixel * pixel));
// int sampleValue = findMax(start, end);
float y =
((float) Math.floor(c.getHeight() / 2)
- (sampleValue * ((float) Math.floor(c.getHeight() / 2) / maxValue)));
points.add(new SoundSample(new Point2D.Float(pixel, y), sampleValue, pixel));
}
} else { // show general contour
int start = sampleBeginIndex;
int end = (int) (sampleBeginIndex + this.samplePerPixel);
int baseLine = c.getHeight() / 2;
for (int pixel = 0; pixel < frameWidth; pixel++) {
ArrayList<Integer> minMax = findMinMax(start, end);
// System.err.println(minMax);
float y = baseLine - (minMax.get(0) * 0.9f / maxValue * baseLine);
points.add(new SoundSample(new Point2D.Float(pixel, y), minMax.get(0), pixel));
y = baseLine - (minMax.get(0) * 0.7f / maxValue * baseLine);
points.add(new SoundSample(new Point2D.Float(pixel, y), minMax.get(0) / 2, pixel));
// System.err.print("Min y: " + y + " ");
y = baseLine - (minMax.get(1) * 0.9f / maxValue * baseLine);
points.add(new SoundSample(new Point2D.Float(pixel, y), minMax.get(1) / 2, pixel));
y = baseLine - (minMax.get(1) * 0.7f / maxValue * baseLine);
points.add(new SoundSample(new Point2D.Float(pixel, y), minMax.get(1), pixel));
// if (y > c.getHeight())
// System.err.println("not right");
start = end + 1;
end = (int) (end + samplePerPixel);
}
}
}
return points;
}