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package com.google.skar;
import android.graphics.Path;
import android.graphics.PointF;
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.
public ArrayList<PointF> points = new ArrayList<>();
public Path path = new Path();
// 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) {
points.add(p);
previousPoint = p;
}
// Used to build a path before rendering it
public void buildPath() {
if (points.size() < 1) {
return;
}
path = new Path();
if (isSmooth) {
// If less than 3 points, than draw a line between the two points
if (points.size() <= 2 && points.size() > 0) {
path.moveTo(points.get(0).x, points.get(0).y);
path.lineTo(points.get(1).x, points.get(1).y);
} else if (points.size() >= 3){
// Else, essentially run deCasteljau
path.moveTo(points.get(0).x, points.get(0).y);
PointF mid = new PointF((points.get(0).x + points.get(1).x) / 2,
(points.get(0).y + points.get(1).y) / 2);
path.lineTo(mid.x, mid.y);
for (int i = 1; i < points.size() - 1; i++) {
PointF p1 = points.get(i);
PointF p2 = points.get(i + 1);
PointF midP = new PointF((p1.x + p2.x) / 2,(p1.y + p2.y) / 2);
path.quadTo(p1.x, p1.y, midP.x, midP.y);
}
path.lineTo(points.get(points.size() - 1).x, points.get(points.size() - 1).y);
}
} else {
path.moveTo(points.get(0).x, points.get(0).y);
for (int i = 1; i < points.size(); i++) {
path.lineTo(points.get(i).x, points.get(i).y);
}
}
}
public boolean isEmpty() {
return path.isEmpty();
}
public float[] getModelMatrix() {
return modelMatrix;
}
public void setModelMatrix(float[] m) {
modelMatrix = m;
}
public void reset() {
points = new ArrayList<>();
path = new Path();
}
}
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