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package com.google.skar.examples.helloskar.app;
import android.graphics.Color;
import android.graphics.Path;
import android.graphics.PointF;
import android.util.Log;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
public class SkARFingerPainting {
// Points obtained by touching the screen. The first point is always brough to (0,0).
// All subsequent points are translated by the same amount.
private ArrayList<PointF> points = new ArrayList<>();
private ArrayList<Integer> jumpPoints = new ArrayList<>();
private Map<Integer, Integer> indexColors = new HashMap<>();
private Map<Path, Integer> pathColors = new HashMap<>();
private ArrayList<Path> paths = new ArrayList<>();
private int color = Color.RED;
// Previous point added to the path. This points belongs to the path in local space.
public PointF previousPoint;
// Holds the model matrix of the first point added to such that the path can be drawn at the
// model location (i.e on the Plane)
private float[] modelMatrix;
private boolean isSmooth;
public SkARFingerPainting(boolean smooth) {
this.isSmooth = smooth;
}
public boolean getSmoothness() {
return isSmooth;
}
public void setSmoothness(boolean smooth) {
isSmooth = smooth;
}
// Adds another point to the path in Local space
public void addPoint(PointF p, boolean jumpPoint) {
points.add(p);
if (jumpPoint) {
Log.i("Jumped!", Integer.toString(points.size() - 1));
jumpPoints.add(points.size() - 1);
indexColors.put(points.size() - 1, color);
}
previousPoint = p;
}
// Used to build a path before rendering it
public void buildPath() {
paths = new ArrayList<>();
if (points.size() <= 1) {
return;
}
if (isSmooth) {
int start = 0;
for (int j = 1; j < jumpPoints.size(); j++) {
int finish = jumpPoints.get(j);
buildSmoothFromTo(start, finish);
start = finish;
}
buildSmoothFromTo(start, points.size());
} else {
int start = 0;
for (int j = 1; j < jumpPoints.size(); j++) {
int finish = jumpPoints.get(j);
buildRoughFromTo(start, finish);
start = finish;
}
buildRoughFromTo(start, points.size());
}
}
private void buildRoughFromTo(int start, int finish) {
Path p = new Path();
int c = indexColors.get(start);
p.moveTo(points.get(start).x, points.get(start).y);
for (int i = start + 1; i < finish; i++) {
p.lineTo(points.get(i).x, points.get(i).y);
}
paths.add(p);
pathColors.put(p, c);
}
private void buildSmoothFromTo(int start, int finish) {
Path p = new Path();
int c = indexColors.get(start);
int nbPts = finish - start;
// If less than 3 points, than draw a line between the two points
if (nbPts <= 2 && nbPts > 1) {
p.moveTo(points.get(start).x, points.get(start).y);
p.lineTo(points.get(start + 1).x, points.get(start + 1).y);
} else if (nbPts >= 3){
// Else, essentially run deCasteljau
p.moveTo(points.get(start).x, points.get(start).y);
p.lineTo((points.get(start).x + points.get(start + 1).x) / 2,
(points.get(start).y + points.get(start + 1).y) / 2);
for (int i = start + 1; i < finish - 1; i++) {
PointF p1 = points.get(i);
PointF p2 = points.get(i + 1);
p.quadTo(p1.x, p1.y, (p1.x + p2.x) / 2, (p1.y + p2.y) / 2);
}
p.lineTo(points.get(finish - 1).x, points.get(finish - 1).y);
}
paths.add(p);
pathColors.put(p, c);
}
public boolean isEmpty() {
return points.isEmpty();
}
public float[] getModelMatrix() {
return modelMatrix;
}
public void setModelMatrix(float[] m) {
modelMatrix = m;
}
public void setColor(int color) {
this.color = color;
}
public int getPathColor(Path p) {
return pathColors.get(p);
}
public ArrayList<Path> getPaths() {
return paths;
}
public void reset() {
points.clear();
jumpPoints.clear();
paths.clear();
pathColors.clear();
indexColors.clear();
}
}
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