如何绘制到一个位图ImageView的手指，并获得坐标，并保存绘制的图像 [英] How to draw onto an ImageView Bitmap with finger and obtain coordinates and save the drawn image
问题描述
基本上我有一个网格（存储为一个图像），像这样：
Basically i have a grid(stored as an image) like so:
我需要做的是汲取此网格用手指（多杆）和显示，并保存新的位图什么。
What I need to do is draw on this grid with my finger(multiple strokes) and display and save this new bitmap.
此外，同时提请我需要获得笔划的坐标，这样我可以从它（整个网格划分为区域）。
Additionally, while drawing I need to obtain the coordinates of the stroke so I can calculate some data from it(The whole grid is divided into zones ).
坐标部分很简单，我没有使用矩形（）的getX（）和的getY（）即
The coordinate part was simple, which I did using Rect(), getX() and getY() viz.
int getZoneLocation(int x, int y)
{
Rect rectangle = new Rect();
amslerView.getGlobalVisibleRect(rectangle);
String coords = "Left:%d Top:%d Right:%d Bottom:%d ActionBarHeight:%d StatusBarHeight:%d";
// Zone 1 Rectangle
Log.i("Rectangle Coordinates",
String.format(coords, rectangle.left, rectangle.top, rectangle.right, rectangle.bottom, getActionBarHeight(), getStatusBarSize()));
Rect outerMostRect = new Rect(rectangle);
int xOffset = rectangle.width() / 10;
int yOffset = rectangle.height() / 10;
Log.i("Rectangle Attribs", "Width: " + xOffset + "Height: " + yOffset);
// Zone 2 Rectangle
Rect zone2Rectangle = new Rect(outerMostRect.left + xOffset, outerMostRect.top + yOffset, outerMostRect.right - xOffset, outerMostRect.bottom
- yOffset);
Log.i("Zone 2 Coordinates", "" + zone2Rectangle.left + " " + zone2Rectangle.top + " " + zone2Rectangle.right + " " + zone2Rectangle.bottom);
// Zone 3 Rectangle
Rect zone3Rectangle = new Rect(zone2Rectangle.left + xOffset, zone2Rectangle.top + yOffset, zone2Rectangle.right - xOffset,
zone2Rectangle.bottom - yOffset);
// Zone 4 Rectangle
Rect zone4Rectangle = new Rect(zone3Rectangle.left + xOffset, zone3Rectangle.top + yOffset, zone3Rectangle.right - xOffset,
zone3Rectangle.bottom - yOffset);
// Zone 5 Rectangle
Rect zone5Rectangle = new Rect(zone4Rectangle.left + xOffset, zone4Rectangle.top + yOffset, zone4Rectangle.right - xOffset,
zone4Rectangle.bottom - yOffset);
// Check from inside out for point existence
if (zone5Rectangle.contains(x, y))
{
return 5;
} else if (zone4Rectangle.contains(x, y))
{
return 4;
} else if (zone3Rectangle.contains(x, y))
{
return 3;
} else if (zone2Rectangle.contains(x, y))
{
return 2;
} else if (outerMostRect.contains(x, y))
{
return 1;
}
return -1;
}
基本上我所做的是从显示这个网格，然后简单地调用此方法来获取数据，我需要里面的onTouchListener获得的ImageView的localVisibleRect。
Basically what I did was obtain the localVisibleRect from the ImageView that displays this grid and then simply call this method to obtain the data I need inside to onTouchListener.
现在对我来说，真正的难题是如何实现手指与此一起绘画，到底该怎么用它来实现这一点。
Now the real dilemma for me is how to implement the finger drawing along with this, and what exactly to use to implement this.
到目前为止，我已经看了SurfaceView，帆布，甚至GestureOverlayView（这是愚蠢的，我知道）。
So far I've looked at SurfaceView, Canvas and even GestureOverlayView(which is stupid I know).
我也采取了看一看该API的例子演示FingerPaint，但是，吸引到一个空的观点，我真的对如何与ImageView的实现这个不知道。
I've also taken a look at the FingerPaint demo from the api examples, but that draws onto an empty view and I honestly have no idea on how to implement this with an ImageView.
任何建议将是非常宝贵的。
Any suggestions would be invaluable.
推荐答案
您可以使用这个类：
import android.view.View.OnTouchListener;
public class XCanvas extends ImageView implements OnTouchListener
{
private Activity context = null;
private Paint paint = null;
public XCanvas(Activity context)
{
super(context);
this.context = context;
this.paint = new Paint();
setFocusable(true);
setFocusableInTouchMode(true);
this.setOnTouchListener(this);
paint.setAntiAlias(true);
}
@Override
protected void onDraw(Canvas g)
{
super.onDraw(g);
//Set background
this.paint.setColor(Color.rgb(0xff, 0xff, 0xff));
g.drawRect(0, 0, this.getWidth(), this.getHeight(), this.paint);
//Paint everything here!
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
int action = event.getAction() & MotionEvent.ACTION_MASK;
switch (action)
{
case MotionEvent.ACTION_DOWN:
{
this.pointerPressed(event);
break;
}
case MotionEvent.ACTION_MOVE:
{
this.pointerDragged(event);
break;
}
case MotionEvent.ACTION_UP:
{
this.pointerReleased();
break;
}
}
return true;
}
protected void pointerPressed(MotionEvent event)
{
//you can save touch point here!
}
protected void pointerDragged(MotionEvent event)
{
//for get x ==> eveevent.getX()
//for get y ==> eveevent.getY()
this.repaint();
}
protected void pointerReleased()
{
}
public void repaint()
{
this.invalidate();
}
}
和使用类粘贴此code的主要活动：
and for use class paste this code in main activity:
private XCanvas xCanvas = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
//getWindow().setBackgroundDrawableResource(R.color.MapBackground);
this.xCanvas = new XCanvas(this);
this.xCanvas.repaint();
setContentView(this.xCanvas);
this.xCanvas.requestFocus();
}
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