Может кто-нибудь сказать мне, почему мои классы движения x, y и тета-значения показывают ожидаемые значения.Но когда он эмулируется / запускается, «перо» отражает все движения, а не находится прямо под точкой касания.Я не хочу менять математику для значений, если мне не нужно, мне просто нужно, чтобы представление показывало то же, что говорит математика.
public class MovementDial extends AppCompatImageView {
public float x, y, r, Radius, _theta, xShift, yShift, offset;
private double distance, distanceAdj;
private RectF _knobRect = new RectF();
private PointF nibCenter, touchPoint;
private RectF nibRect = new RectF();
OnAngleChangedListener _angleChangedListener = null;
public interface OnAngleChangedListener {
void onAngleChanged(float theta);
}
public MovementDial(Context context) {
super(context);
nibCenter = new PointF(_knobRect.centerX(), _knobRect.centerY());
}
public float getTheta() {
return _theta;
}
public void setTheta (float theta){
_theta = theta;
invalidate();
}
public void setOnAngleChangedListener(OnAngleChangedListener listener) {
_angleChangedListener = listener;
}
private int map(double x, double in_min, double in_max, double out_min, double out_max) //@author: Aaron Pabst
{
int mapVal = (int) ((int)(x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min);
return mapVal;
}
@Override
public boolean onTouchEvent(MotionEvent e) {
yShift = e.getY();
xShift = e.getX();
touchPoint = new PointF();
touchPoint.x = (int)(e.getX() - _knobRect.centerX());
touchPoint.y = map(yShift,0,(_knobRect.height()-_knobRect.centerY()),(_knobRect.height()-_knobRect.centerY()), 0);
x = touchPoint.x;
y = touchPoint.y;
float theta = mapThetaCoords(x,y); //maps out theta values between 0 to 360 using a traditional unit circle layout.
setTheta(theta);
double Radian = Math.toRadians(_theta);
final double PIValue = Math.PI/180;
Log.i("Touch", "initial Xvalue is :" +touchPoint.x);
Log.i("Touch", "initial Yvalue is :" +touchPoint.y);
Log.i ("Touch", "Touch point 3 changed to: " + theta);
distance = (float) Math.hypot(x, y); //polar coordinate radius (r = sqrt x^2 + y^2)
if(e.getAction() == MotionEvent.ACTION_DOWN) {
Log.i("Touch", "Xvalue touch is :" +touchPoint.x);
Log.i("Touch", "Yvalue touch is :" +touchPoint.y);
Log.i ("Touch", "Touch point 6 changed to: " + theta);
if(yShift == Radian)
if(distance <= Radius) {
nibCenter.x = _knobRect.centerX() - (float)(Radius * Math.cos(Math.toRadians(theta)));
nibCenter.y = _knobRect.centerY() - (float)(Radius * Math.sin(Math.toRadians(theta)));
x = touchPoint.x;
y = touchPoint.y;
Log.i("Touch", "Xvalue touch2 is :" +touchPoint.x);
Log.i("Touch", "Yvalue touch2 is :" +touchPoint.y);
Log.i("Touch", "Xvalue nib2 touch is :" +nibCenter.x);
Log.i("Touch", "Yvalue nib2 touch is :" +nibCenter.y);
} else if(distance > Radius) {
Log.i("Touch", "Xvalue touch3 is :" +touchPoint.x);
Log.i("Touch", "Yvalue touch3 is :" +touchPoint.y);
nibCenter.x = _knobRect.centerX() - (float)(Radius * Math.cos(Math.toRadians(theta)));
nibCenter.y = _knobRect.centerY() - (float)(Radius * Math.sin(Math.toRadians(theta)));
x = touchPoint.x;
y = touchPoint.y;
Log.i("Touch", "Xvalue nib1 touch is :" +nibCenter.x);
Log.i("Touch", "Yvalue nib1 touch is :" +nibCenter.y);
}
invalidate();
return true;
} else if (e.getAction() == MotionEvent.ACTION_MOVE) {
Log.i("Touch", "Xvalue2 move is :" + touchPoint.x);
Log.i("Touch", "Yvalue2 move is :" + touchPoint.y);
Log.i ("Touch", "Move value point 7 changed to: " + theta);
distanceAdj = distance;
distance = Math.min(distance, distanceAdj); //comparing changing polar radius values as coordinates change place.
if(distance <= Radius) { //check to see if polar radius coordinate is less or equal to the radius value
nibCenter.x = _knobRect.centerX() - (float)(distance * Math.cos(Math.toRadians(theta)));
nibCenter.y = _knobRect.centerY() - (float)(distance * Math.sin(Math.toRadians(theta)));
x = touchPoint.x;
y = touchPoint.y;
Log.i("Touch", "Xvalue move1 is :" + x);
} else if (distance > Radius){
Log.i("Touch", "Yvalue (greater than) move is :" + y);
nibCenter.x = _knobRect.centerX() - (float)(distance * Math.cos(Math.toRadians(theta) - 360));
nibCenter.y = _knobRect.centerY() - (float)(distance * Math.sin(Math.toRadians(theta) - 360));
x = touchPoint.x;
y = touchPoint.y;
Log.i("Touch", "Xvalue move2 is :" + x);
Log.i("Touch", "Yvalue move2 is :" + y);
}
invalidate();
return true;
} else if (e.getAction() == MotionEvent.ACTION_UP){
reset();
}
return false;
}
public float mapThetaCoords(float x, float y) {
double atan2 = Math.atan2(y , x);
float theta;
if (x >= 0 && y >= 0) { // Q 1
theta = (float) Math.toDegrees(atan2);
return theta;
} else if (x < 0 && y > 0) { // Q 2
theta = (float) Math.toDegrees(atan2);
return theta;
} else if (x < 0 && y < 0) { // Q 3
theta = (float) Math.toDegrees(atan2) + 360;
return theta;
} else if (x > 0 && y < 0) { // Q 4
theta = (float) Math.toDegrees(atan2) + 360;
return theta;
}
return 0;
}
public void reset(){
x = _knobRect.centerX()-(_knobRect.width()/2);
y = _knobRect.centerY()-(_knobRect.height()/2);
nibCenter.x = x;
nibCenter.y = y + _knobRect.centerY();
_theta = 0f;
distance = 0f;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
_knobRect.left = getPaddingLeft();
_knobRect.top = getPaddingTop();
_knobRect.right = getWidth()- getPaddingRight();
_knobRect.bottom = _knobRect.width();
offset = (getHeight() - _knobRect.height()) * 0.5f;
_knobRect.top += offset;
_knobRect.bottom += offset;
Radius = _knobRect.width() * 0.35f;
nibCenter.x = x + _knobRect.centerX();
nibCenter.y = y + _knobRect.centerY();
float nibRadius = Radius * 0.2f;
nibRect.left = nibCenter.x - nibRadius;
nibRect.top = nibCenter.y - nibRadius;
nibRect.right = nibCenter.x + nibRadius;
nibRect.bottom = nibCenter.y + nibRadius;
Paint knobPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
knobPaint.setColor(Color.BLACK);
Paint nibPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
nibPaint.setColor(Color.MAGENTA);
canvas.drawOval(_knobRect, knobPaint);
canvas.drawOval(nibRect, nibPaint);
}