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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package de.engehausen.mb; | ||
|
|
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| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Spliterator; | ||
| import java.util.function.Consumer; | ||
| import java.util.stream.Stream; | ||
| import java.util.stream.StreamSupport; | ||
|
|
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| import de.engehausen.mb.math.Point3D; | ||
|
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| public class FrameStreams { | ||
|
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| public static Stream<FrameData> buildLinear(final List<FrameData> frames, final int frameCount) { | ||
| return StreamSupport.stream(new LinearIterator(frames, frameCount), false); | ||
| } | ||
|
|
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| public static Stream<FrameData> buildLogarithmic(final List<FrameData> frames, final int desiredFrameCount) { | ||
| return StreamSupport.stream(new LogarithmicIterator(frames, desiredFrameCount), false); | ||
| } | ||
|
|
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| private static abstract class AbstractIterator implements Spliterator<FrameData> { | ||
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| protected final Iterator<FrameData> iterator; | ||
| protected final int max; | ||
| protected final FrameData inter; | ||
| protected final double scaleStart; | ||
| protected FrameData current; | ||
| protected FrameData next; | ||
| protected int pos; | ||
|
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| public AbstractIterator(final List<FrameData> frames, final int max) { | ||
| final int size = frames.size(); | ||
| if (size < 2) { | ||
| throw new IllegalArgumentException("must have at least two frames"); | ||
| } | ||
| iterator = frames.iterator(); | ||
| this.max = max; | ||
| current = iterator.next(); | ||
| next = iterator.next(); | ||
| scaleStart = current.scale; | ||
| inter = new FrameData(current); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean tryAdvance(final Consumer<? super FrameData> consumer) { | ||
| if (pos > max) { | ||
| return false; | ||
| } | ||
| final double actual = getScale(); | ||
| if (actual < next.scale) { | ||
| current = next; | ||
| next = iterator.next(); | ||
| } | ||
| final Point3D interpolated = interpolate(actual); | ||
| inter.topLeft.setReal(interpolated.x); | ||
| inter.topLeft.setImaginary(interpolated.y); | ||
| inter.scale = interpolated.z; | ||
| inter.frameOffset = current.frameOffset; | ||
| consumer.accept(inter); | ||
| pos++; | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public Spliterator<FrameData> trySplit() { | ||
| return this; | ||
| } | ||
|
|
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| @Override | ||
| public long estimateSize() { | ||
| return max; | ||
| } | ||
|
|
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| @Override | ||
| public int characteristics() { | ||
| return Spliterator.ORDERED; | ||
| } | ||
|
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| protected abstract double getScale(); | ||
|
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| protected Point3D interpolate(final double scale) { | ||
| final double t = (scale - current.scale) / (next.scale - current.scale); | ||
| return Point3D.linear( | ||
| t, | ||
| new Point3D(current.topLeft, current.scale), | ||
| new Point3D(next.topLeft, next.scale) | ||
| ); | ||
| } | ||
| } | ||
|
|
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| private static class LinearIterator extends AbstractIterator { | ||
|
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| private final double step; | ||
|
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| public LinearIterator(final List<FrameData> frames, final int max) { | ||
| super(frames, max); | ||
| step = (frames.get(frames.size() - 1).scale - current.scale) / (double) max; | ||
| } | ||
|
|
||
| @Override | ||
| protected double getScale() { | ||
| return scaleStart + step * pos; | ||
| } | ||
|
|
||
| } | ||
|
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| private static class LogarithmicIterator extends AbstractIterator { | ||
|
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| private static final double BASE = 0.95d; | ||
| private double factor; | ||
| private double initial; | ||
|
|
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| public LogarithmicIterator(final List<FrameData> frames, final int max) { | ||
| super(frames, max); | ||
| initial = current.scale; | ||
| factor = (Math.log(frames.get(frames.size() - 1).scale / (BASE * initial)) / Math.log(BASE)) / max; | ||
| } | ||
|
|
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| @Override | ||
| protected double getScale() { | ||
| return initial * Math.pow(BASE, factor * pos); | ||
| } | ||
|
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| @Override | ||
| protected Point3D interpolate(final double scale) { | ||
| final double t = (scale - current.scale) / (next.scale - current.scale); | ||
| final Point3D from = new Point3D(current.topLeft, current.scale); | ||
| final Point3D to = new Point3D(next.topLeft, next.scale); | ||
| return Point3D.bezier( | ||
| t, | ||
| from, | ||
| from, | ||
| to, | ||
| to | ||
| ); | ||
| } | ||
|
|
||
| } | ||
|
|
||
| } |
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