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package com.davemorrissey.labs.subscaleview.test.extension.views;
import android.content.Context;
import android.graphics.*;
import android.graphics.Paint.Cap;
import android.graphics.Paint.Style;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView;
import java.util.ArrayList;
import java.util.List;
public class FreehandView extends SubsamplingScaleImageView implements OnTouchListener {
private final Paint paint = new Paint();
private final Path vPath = new Path();
private final PointF vPoint = new PointF();
private PointF vPrev = new PointF();
private PointF vPrevious;
private PointF vStart;
private boolean drawing = false;
private int strokeWidth;
private List<PointF> sPoints;
public FreehandView(Context context, AttributeSet attr) {
super(context, attr);
initialise();
}
public FreehandView(Context context) {
this(context, null);
}
private void initialise() {
setOnTouchListener(this);
float density = getResources().getDisplayMetrics().densityDpi;
strokeWidth = (int)(density/60f);
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return false;
}
@Override
public boolean onTouchEvent(@NonNull MotionEvent event) {
if (sPoints != null && !drawing) {
return super.onTouchEvent(event);
}
boolean consumed = false;
int touchCount = event.getPointerCount();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
if (event.getActionIndex() == 0) {
vStart = new PointF(event.getX(), event.getY());
vPrevious = new PointF(event.getX(), event.getY());
} else {
vStart = null;
vPrevious = null;
}
break;
case MotionEvent.ACTION_MOVE:
PointF sCurrentF = viewToSourceCoord(event.getX(), event.getY());
PointF sCurrent = new PointF(sCurrentF.x, sCurrentF.y);
PointF sStart = vStart == null ? null : new PointF(viewToSourceCoord(vStart).x, viewToSourceCoord(vStart).y);
if (touchCount == 1 && vStart != null) {
float vDX = Math.abs(event.getX() - vPrevious.x);
float vDY = Math.abs(event.getY() - vPrevious.y);
if (vDX >= strokeWidth * 5 || vDY >= strokeWidth * 5) {
if (sPoints == null) {
sPoints = new ArrayList<>();
sPoints.add(sStart);
}
sPoints.add(sCurrent);
vPrevious.x = event.getX();
vPrevious.y = event.getY();
drawing = true;
}
consumed = true;
invalidate();
} else if (touchCount == 1) {
// Consume all one touch drags to prevent odd panning effects handled by the superclass.
consumed = true;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
invalidate();
drawing = false;
vPrevious = null;
vStart = null;
}
// Use parent to handle pinch and two-finger pan.
return consumed || super.onTouchEvent(event);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Don't draw anything before image is ready.
if (!isReady()) {
return;
}
paint.setAntiAlias(true);
if (sPoints != null && sPoints.size() >= 2) {
vPath.reset();
sourceToViewCoord(sPoints.get(0).x, sPoints.get(0).y, vPrev);
vPath.moveTo(vPrev.x, vPrev.y);
for (int i = 1; i < sPoints.size(); i++) {
sourceToViewCoord(sPoints.get(i).x, sPoints.get(i).y, vPoint);
vPath.quadTo(vPrev.x, vPrev.y, (vPoint.x + vPrev.x) / 2, (vPoint.y + vPrev.y) / 2);
vPrev = vPoint;
}
paint.setStyle(Style.STROKE);
paint.setStrokeCap(Cap.ROUND);
paint.setStrokeWidth(strokeWidth * 2);
paint.setColor(Color.BLACK);
canvas.drawPath(vPath, paint);
paint.setStrokeWidth(strokeWidth);
paint.setColor(Color.argb(255, 51, 181, 229));
canvas.drawPath(vPath, paint);
}
}
public void reset() {
this.sPoints = null;
invalidate();
}
}
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