// int x1, x2, y;
private void drawLine(int currentY, int index) {
// добавление рассматриваемых плоскостей
for (; index < setBorders.size() && setBorders.get(index) >= currentY; index++) {
changeDrawnSurfacesList(currentY, true);
}
// поиск всех точек, пересекающих эту плоскость, и составление из них отрезков
// поиск точек пересечения между этими отрезками
findAllIntersections(currentY);
// сортировка
pointsList =
(ArrayList<Point>)
pointsList
.stream()
.sorted((a, b) -> Double.compare(a.getX(), b.getX()))
.collect(Collectors.toList());
// отрисовка
Point last = new Point(0, currentY, 0);
for (Point p : pointsList) {
ArrayList<PointEvent> events = listPointsEvent.getEvent((int) p.getX());
for (PointEvent event : events) {
if (event.event == PointEventsList.START) {
drawnSegments.add(event.point.getParent());
}
}
if (drawnSegments.size() > 0) {
double maxZ = -Double.MAX_VALUE;
Segment chosen = null;
for (Segment seg : drawnSegments) {
double z = seg.getZOnX(p.getX());
if (z > maxZ) {
maxZ = z;
chosen = seg;
}
}
if (chosen != null && maxZ > -Double.MAX_VALUE) {
context.setStroke(chosen.getSurfaceColor());
double x1 = canvas.getWidth() / 4 + last.getX() * 2,
x2 = canvas.getWidth() / 4 + p.getX() * 2,
y = canvas.getHeight() / 2 + currentY;
context.strokeLine(x1, y, x2, y);
}
}
// актуализация отрезков
for (PointEvent event : events) {
if (event.event == PointEventsList.FINISH) {
drawnSegments.remove(event.point.getParent());
}
}
last = p;
}
}
public void initTimer(int currentY, int index) {
for (; index < setBorders.size() && setBorders.get(index) >= currentY; index++) {
changeDrawnSurfacesList(currentY, true);
}
findAllIntersections(currentY);
pointsList =
(ArrayList<Point>)
pointsList
.stream()
.sorted((a, b) -> Double.compare(a.getX(), b.getX()))
.collect(Collectors.toList());
Point last = new Point(0, currentY, 0);
for (Point p : pointsList) {
ArrayList<PointEvent> events = listPointsEvent.getEvent((int) p.getX());
for (PointEvent event : events) {
if (event.event == PointEventsList.START) {
drawnSegments.add(event.point.getParent());
}
}
if (drawnSegments.size() > 0) {
double maxZ = -Double.MAX_VALUE;
Segment chosen = null;
for (Segment seg : drawnSegments) {
double z = seg.getZOnX(p.getX());
if (z > maxZ) {
maxZ = z;
chosen = seg;
}
}
if (chosen != null && maxZ > -Double.MAX_VALUE) {
// context.setStroke(chosen.getSurfaceColor());
double x1 = canvas.getWidth() / 4 + last.getX() * 2,
x2 = canvas.getWidth() / 4 + p.getX() * 2,
y = canvas.getHeight() / 2 + currentY;
Segment segment =
new Segment(new Point(x1, y, 0), new Point(x2, y, 0), chosen.getSurfaceColor());
result.add(segment);
// context.strokeLine(x1, y, x2, y);
}
}
// актуализация отрезков
for (PointEvent event : events) {
if (event.event == PointEventsList.FINISH) {
drawnSegments.remove(event.point.getParent());
}
}
last = p;
}
AnimationTimer timer =
new AnimationTimer() {
@Override
public void handle(long now) {
if (indexResult == result.size() - 1) {
stop();
return;
}
segmentResult = result.get(indexResult++);
context.setStroke(segmentResult.getSurfaceColor());
context.strokeLine(
segmentResult.getStart().getX(),
segmentResult.getStart().getY(),
segmentResult.getFinish().getX(),
segmentResult.getFinish().getY());
}
};
timer.start();
}
/**
* Поиск всех точек пересечения поверхностей с плоскостью У, а также поиск пересечений между
* отрезками получающимися.
*
* @param currentY
*/
private void findAllIntersections(double currentY) {
drawnSegments.clear();
pointsList.clear();
listPointsEvent.map.clear();
for (Surface surface : drawnSurfaces) {
Segment segment = surface.getIntersectionWithY(currentY);
if (segment == null) {
continue;
}
if (segment.getFinish().getX() < segment.getStart().getX()) {
segment = new Segment(segment.getFinish(), segment.getStart(), surface.getSurfaceColor());
}
segments.add(segment);
pointsList.add(segment.getStart());
pointsList.add(segment.getFinish());
listPointsEvent.addEvent(
new PointEvent(PointEventsList.START, segment.getStart()),
(int) segment.getStart().getX());
listPointsEvent.addEvent(
new PointEvent(PointEventsList.FINISH, segment.getFinish()),
(int) segment.getFinish().getX());
}
for (int i = 0, number = drawnSegments.size(); i < number; i++) {
for (int j = i + 1; j < number; j++) {
Point intersection = drawnSegments.get(i).getIntersectionWithSegment(drawnSegments.get(j));
if (intersection != null) {
pointsList.add(intersection);
listPointsEvent.addEvent(
new PointEvent(PointEventsList.INTERSECTION, intersection),
(int) intersection.getX());
}
}
}
}