// According to the event's position, change the focus to the first
// hitting cropping rectangle.
private void RecomputeFocus(MotionEvent e)
{
int count = this.MotionHighlightViews.Count;
for (int i = 0; i < count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
hv.Focused = false;
hv.Invalidate();
}
for (int i = 0; i < count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
int edge = hv.GetHit(e.GetX(), e.GetY());
if (edge != HighlightView.GrowNone)
{
if (!hv.Focused)
{
hv.Focused = true;
hv.Invalidate();
}
break;
}
}
this.Invalidate();
}
// If the cropping rectangle's size changed significantly, change the
// view's center and scale according to the cropping rectangle.
private void CenterBasedOnHighlightView(EmHighlightView hv)
{
Rect drawRect = hv.MDrawRect;
float width = drawRect.Width();
float height = drawRect.Height();
float thisWidth = this.Width;
float thisHeight = this.Height;
float z1 = thisWidth / width * .6F;
float z2 = thisHeight / height * .6F;
float zoom = Math.Min(z1, z2);
zoom = zoom * this.GetScale();
zoom = Math.Max(1F, zoom);
if ((Math.Abs(zoom - this.GetScale()) / zoom) > .1)
{
float [] coordinates = new float[] { hv.MCropRect.CenterX(),
hv.MCropRect.CenterY() };
this.ImageMatrix.MapPoints(coordinates);
ZoomTo(zoom, coordinates[0], coordinates[1], 300F);
}
EnsureVisible(hv);
}
// For each face, we create a HightlightView for it.
private void HandleFace(FaceDetector.Face f)
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
PointF midPoint = new PointF();
int r = ((int)(f.EyesDistance() * this.Scale)) * 2;
f.GetMidPoint(midPoint);
midPoint.X *= this.Scale;
midPoint.Y *= this.Scale;
int midX = (int)midPoint.X;
int midY = (int)midPoint.Y;
EmHighlightView hv = new EmHighlightView(eci.ImageView, eci.MOutlineColor, eci.MOutlineCircleColor);
int width = eci.Bitmap.Width;
int height = eci.Bitmap.Height;
Rect imageRect = new Rect(0, 0, width, height);
RectF faceRect = new RectF(midX, midY, midX, midY);
faceRect.Inset(-r, -r);
if (faceRect.Left < 0)
{
faceRect.Inset(-faceRect.Left, -faceRect.Left);
}
if (faceRect.Top < 0)
{
faceRect.Inset(-faceRect.Top, -faceRect.Top);
}
if (faceRect.Right > imageRect.Right)
{
faceRect.Inset(faceRect.Right - imageRect.Right, faceRect.Right - imageRect.Right);
}
if (faceRect.Bottom > imageRect.Bottom)
{
faceRect.Inset(faceRect.Bottom - imageRect.Bottom, faceRect.Bottom - imageRect.Bottom);
}
hv.Setup(this.MImageMatrix, imageRect, faceRect, eci.CircleCropping, eci.AspectX != 0 && eci.AspectY != 0);
eci.ImageView.Add(hv);
}
protected override void PostTranslate(float deltaX, float deltaY)
{
base.PostTranslate(deltaX, deltaY);
int count = this.MotionHighlightViews.Count;
for (int i = 0; i < count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
hv.Matrix.PostTranslate(deltaX, deltaY);
hv.Invalidate();
}
}
// Pan the displayed image to make sure the cropping rectangle is visible.
private void EnsureVisible(EmHighlightView hv)
{
Rect r = hv.MDrawRect;
int panDeltaX1 = Math.Max(0, this.Left - r.Left);
int panDeltaX2 = Math.Min(0, this.Right - r.Right);
int panDeltaY1 = Math.Max(0, this.Top - r.Top);
int panDeltaY2 = Math.Min(0, this.Bottom - r.Bottom);
int panDeltaX = panDeltaX1 != 0 ? panDeltaX1 : panDeltaX2;
int panDeltaY = panDeltaY1 != 0 ? panDeltaY1 : panDeltaY2;
if (panDeltaX != 0 || panDeltaY != 0)
{
this.PanBy(panDeltaX, panDeltaY);
}
}
private void MakeDefault()
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
EmHighlightView hv = new EmHighlightView(eci.ImageView, eci.MOutlineColor, eci.MOutlineCircleColor);
int width = eci.Bitmap.Width;
int height = eci.Bitmap.Height;
Rect imageRect = new Rect(0, 0, width, height);
// make the default size about 4/5 of the width or height
int cropWidth = Java.Lang.Math.Min(width, height) * 4 / 5;
int cropHeight = cropWidth;
if (eci.AspectX != 0 && eci.AspectY != 0)
{
if (eci.AspectX > eci.AspectY)
{
cropHeight = cropWidth * eci.AspectY / eci.AspectX;
}
else
{
cropWidth = cropHeight * eci.AspectX / eci.AspectY;
}
}
int x = (width - cropWidth) / 2;
int y = (height - cropHeight) / 2;
RectF cropRect = new RectF(x, y, x + cropWidth, y + cropHeight);
hv.Setup(this.MImageMatrix, imageRect, cropRect, eci.CircleCropping,
eci.AspectX != 0 && eci.AspectY != 0);
eci.ImageView.Add(hv);
}
public void Add(EmHighlightView hv)
{
this.MotionHighlightViews.Add(hv);
this.Invalidate();
}
public override bool OnTouchEvent(MotionEvent e)
{
EmCropImage cropImage = (EmCropImage)this.Context;
if (cropImage.Saving)
{
return(false);
}
switch (e.Action)
{
case MotionEventActions.Down:
{
if (cropImage.WaitingToPick)
{
RecomputeFocus(e);
}
else
{
for (int i = 0; i < this.MotionHighlightViews.Count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
int edge = hv.GetHit(e.GetX(), e.GetY());
if (edge != HighlightView.GrowNone)
{
this.MotionEdge = edge;
this.MotionHighlightView = hv;
this.LastX = e.GetX();
this.LastY = e.GetY();
this.MotionHighlightView.SetMode(
(edge == EmHighlightView.MOVE)
? EmHighlightView.ModifyMode.Move
: EmHighlightView.ModifyMode.Grow);
break;
}
}
}
break;
}
case MotionEventActions.Up:
{
if (cropImage.WaitingToPick)
{
for (int i = 0; i < this.MotionHighlightViews.Count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
if (hv.Focused)
{
cropImage.MCrop = hv;
for (int j = 0; j < this.MotionHighlightViews.Count; j++)
{
if (j == i)
{
continue;
}
this.MotionHighlightViews [j].Hidden = true;
}
CenterBasedOnHighlightView(hv);
((EmCropImage)this.Context).WaitingToPick = false;
return(true);
}
}
}
else
{
if (this.MotionHighlightView != null)
{
CenterBasedOnHighlightView(this.MotionHighlightView);
this.MotionHighlightView.SetMode(EmHighlightView.ModifyMode.None);
}
}
this.MotionHighlightView = null;
break;
}
case MotionEventActions.Move:
{
if (cropImage.WaitingToPick)
{
RecomputeFocus(e);
}
else
{
if (this.MotionHighlightView != null)
{
this.MotionHighlightView.HandleMotion(this.MotionEdge,
e.GetX() - this.LastX,
e.GetY() - this.LastY);
this.LastX = e.GetX();
this.LastY = e.GetY();
if (true)
{
// This section of code is optional. It has some user
// benefit in that moving the crop rectangle against
// the edge of the screen causes scrolling but it means
// that the crop rectangle is no longer fixed under
// the user's finger.
EnsureVisible(this.MotionHighlightView);
}
}
}
break;
}
}
switch (e.Action)
{
case MotionEventActions.Up:
{
this.Center(true, true);
break;
}
case MotionEventActions.Move:
{
if (this.GetScale() == 1f)
{
Center(true, true);
}
break;
}
}
return(true);
}
