Android 自定义控件之图片裁剪
package view;
import java.util.ArrayList;
import java.util.List;
import util.SystemUtil;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import com.example.cropimageview.R;
public final class ViewfinderView extends View {
private Paint paint;
private Paint tipPaint;
private Rect frame;// 保存透明窗的边界
private int frameWidth;// 保存透明窗的宽
private int frameHeight;// 保存透明窗的高
private Rect bitmapRect;// 保存bitmap的边界
private int width;// 屏幕宽
private int height;// 屏幕高
private Bitmap bitmap;// 需要截取的图片
private int bitmapWidth;// 图片的宽
private int bitmapHeight;// 图片的高
private int downX;// 按下时的x
private int downY;// 按下时的y
private boolean touchInFrame = false;// 触摸是否发生在透明窗
private boolean touchFrameLeft = false;// 是否触摸左边界
private boolean touchFrameTop = false;// 是否触摸上边界
private boolean touchFrameRight = false;// 是否触摸右边界
private boolean touchFrameBottom = false;// 是否触摸下边界
public ViewfinderView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(getResources().getColor(R.color.viewfinder_mask));
tipPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
tipPaint.setAntiAlias(true);
tipPaint.setStyle(Style.FILL);
tipPaint.setColor(Color.WHITE);
frame = new Rect();
bitmapRect = new Rect();
width = SystemUtil.getScreenSize(context)[0];
height = SystemUtil.getScreenSize(context)[1];
}
@Override
public void onDraw(Canvas canvas) {
if (bitmap != null) {
// 画阴影
canvas.drawRect(0, 0,frame.left, height,paint);
canvas.drawRect(frame.left, 0, frame.right, frame.top, paint);
canvas.drawRect(frame.right, 0, width, height, paint);
canvas.drawRect(frame.left, frame.bottom, frame.right, height,
paint);
// 画圆点标注
canvas.drawCircle(frame.left, (frame.top + frame.bottom) / 2, 10,
tipPaint);
canvas.drawCircle(frame.right, (frame.top + frame.bottom) / 2, 10,
tipPaint);
canvas.drawCircle((frame.left + frame.right) / 2, frame.top, 10,
tipPaint);
canvas.drawCircle((frame.left + frame.right) / 2, frame.bottom, 10,
tipPaint);
// 画边框标注
// canvas.drawCircle(frame.left, (frame.top + frame.bottom) / 2, 10,
// tipPaint);
//
// canvas.drawCircle(frame.right, (frame.top + frame.bottom) / 2, 10,
// tipPaint);
//
// canvas.drawCircle((frame.left + frame.right) / 2, frame.top, 10,
// tipPaint);
//
// canvas.drawCircle((frame.left + frame.right) / 2, frame.bottom, 10,
// tipPaint);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = (int) event.getX();
downY = (int) event.getY();
if (checkContainsPoint(downX, downY)) {
touchInFrame = true;
if ((downX > frame.left - 10 && downX < frame.left + 10)
&& downY > frame.top && downY < frame.bottom) {
touchFrameLeft = true;
}
if ((downX > frame.right - 10 && downX < frame.right + 10)
&& downY > frame.top && downY < frame.bottom) {
touchFrameRight = true;
}
if ((downX > frame.left && downX < frame.right)
&& downY > frame.top - 10 && downY < frame.top + 10) {
touchFrameTop = true;
}
if ((downX > frame.left && downX < frame.right)
&& downY > frame.bottom - 10
&& downY < frame.bottom + 10) {
touchFrameBottom = true;
}
} else {
touchInFrame = false;
}
break;
case MotionEvent.ACTION_MOVE:
if (!touchInFrame) {
return true;
}
int currentX = (int) event.getX();
int currentY = (int) event.getY();
// 是否在边界上判断
if (touchFrameLeft) {
frame.left += currentX - downX;
if (frame.left <= bitmapRect.left) {
frame.left = bitmapRect.left;
}
frameWidth = frame.right - frame.left;
downX = currentX;
invalidate();
return true;
}
if (touchFrameRight) {
frame.right += currentX - downX;
if (frame.right >= bitmapRect.right) {
frame.right = bitmapRect.right;
}
frameWidth = frame.right - frame.left;
downX = currentX;
invalidate();
return true;
}
if (touchFrameTop) {
frame.top += currentY - downY;
if (frame.top <= bitmapRect.top) {
frame.top = bitmapRect.top;
}
frameHeight = frame.bottom - frame.top;
downY = currentY;
invalidate();
return true;
}
if (touchFrameBottom) {
frame.bottom += currentY - downY;
if (frame.bottom >= bitmapRect.bottom) {
frame.bottom = bitmapRect.bottom;
}
frameHeight = frame.bottom - frame.top;
downY = currentY;
invalidate();
return true;
}
// 触摸发生不属于边界
frame.left += currentX - downX;
frame.right += currentX - downX;
frame.top += currentY - downY;
frame.bottom += currentY - downY;
if (frame.left <= bitmapRect.left) {
frame.left = bitmapRect.left;
frame.right = bitmapRect.left + frameWidth;
}
if (frame.right >= bitmapRect.right) {
frame.left = bitmapRect.right - frameWidth;
frame.right = bitmapRect.right;
}
if (frame.top <= bitmapRect.top) {
frame.top = bitmapRect.top;
frame.bottom = bitmapRect.top + frameHeight;
}
if (frame.bottom >= bitmapRect.bottom) {
frame.top = bitmapRect.bottom - frameHeight;
frame.bottom = bitmapRect.bottom;
}
downX = currentX;
downY = currentY;
invalidate();
break;
case MotionEvent.ACTION_UP:
touchFrameLeft = false;
touchFrameTop = false;
touchFrameRight = false;
touchFrameBottom = false;
break;
default:
break;
}
return true;
}
public void setBitmap(Bitmap bitmap) {
this.bitmap = bitmap;
bitmapWidth = frameWidth = bitmap.getWidth();
bitmapHeight = frameHeight = bitmap.getHeight();
bitmapRect.left = (width - bitmapWidth) / 2;
bitmapRect.right = width - (width - bitmapWidth) / 2;
bitmapRect.top = (height - bitmapHeight) / 2;
bitmapRect.bottom = height - (height - bitmapHeight) / 2;
frame.left = bitmapRect.left;
frame.right = bitmapRect.right;
frame.top = bitmapRect.top;
frame.bottom = bitmapRect.bottom;
invalidate();
}
private boolean checkContainsPoint(int x, int y) {
Rect boundsRect = new Rect();
boundsRect.left = frame.left - 10;
boundsRect.top = frame.top - 10;
boundsRect.right = frame.right + 10;
boundsRect.bottom = frame.bottom + 10;
if (boundsRect.contains(x, y)) {
return true;
}
return false;
}
/**
* 获取需要裁剪的边界比例
*
* @return
*/
public List getClipScale() {
List scales = new ArrayList();
scales.add((frame.left - bitmapRect.left) * 1.0f / bitmapWidth);
scales.add((bitmapRect.right - frame.right) * 1.0f / bitmapWidth);
scales.add((frame.top - bitmapRect.top) * 1.0f / bitmapHeight);
scales.add((bitmapRect.bottom - frame.bottom) * 1.0f / bitmapHeight);
return scales;
}
}
http://download.csdn.net/detail/luo446718254/9605345