我是Android新手，我想 缩放和旋转我的图片 而不使用Imageview。我可以拖动图像。
代码：
public class SimpImageView extends BaseView{
private Bitmap image = null;
private Paint borderPaint = null;
PointF start = new PointF();
PointF lastPosition = new PointF();
private Matrix savedMatrix = new Matrix();
private Paint imagePaint = null;
private Matrix matrix = new Matrix();
float initialRotation;
float currentRotation;
private float initialScale;
private float currentScale;
PointF mid = new PointF();
float oldDist = 1f;
private Bitmap rotatedImage;
public Bitmap getImage() {
return image;
}
public void setImage(Bitmap image) {
this.image = image;
}
public SimpImageView(Bitmap image,int x,int y,int width,int height){
super(x, y, width, height);
this.image = image;
imagePaint = new Paint();
imagePaint.setARGB(32, 255, 255, 255);
imagePaint.setStyle(Paint.Style.FILL);
}
/* (non-Javadoc)
* @see com.simplogics.surfaceview.Views.BaseView#onDraw(android.graphics.Canvas)
*/
@Override
public void onDraw(Canvas canvas) {
canvas.drawBitmap(getImage(), getBounds().left,getBounds().top, new Paint());
}
/* (non-Javadoc)
* @see com.simplogics.surfaceview.Views.BaseView#onTouchEvent(android.view.MotionEvent)
*/
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
@Override
public boolean onTouchEvent(MotionEvent event) {
boolean handled = false;
Log.d("SimpEditText", "(int)event.getX() " + (int)event.getX());
Log.d("SimpEditText", "(int)event.getY() " + (int)event.getY());
if(isTouchedInBounds((int)event.getX(), (int)event.getY())){
Log.d("SimpEditText", "Touched in Bounds");
handled = true;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
lastPosition.x = getBounds().left;
lastPosition.y = getBounds().top;
Log.d("VerticalLabelView", "mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
mode = ZOOM;
initialScale = spacing(event);
midPoint(mid, event);
Log.d("VerticalLabelView", "mode=ZOOM");
currentRotation = rotation(event);
break;
case MotionEvent.ACTION_UP:
mode = NONE;
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d("VerticalLabelView", "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
int x = (int)(event.getX() - start.x);
int y = (int)(event.getY() - start.y);
setPosition((int)lastPosition.x + x, (int)lastPosition.y + y);
}else if(mode == ZOOM){
currentScale = spacing(event);
float scale =currentScale/initialScale;
this.image = rotatedImage;
this.setScale(0, 0,(int) (getBounds().width()*scale),(int) (getBounds().height()*scale));
}
break;
}
}
return handled;
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
private float rotation(MotionEvent event) {
double delta_x = (event.getX(0) - event.getX(1));
double delta_y = (event.getY(0) - event.getY(1));
double radians = Math.atan2(delta_y, delta_x);
Log.d("Rotation ~~~~~~~~~~~~~~~~~", delta_x + " ## " + delta_y + " ## "
+ radians + " ## " + Math.toDegrees(radians));
return (float) Math.toDegrees(radians);
}
}
BaseView.java课程：
public abstract class BaseView {
private int id = -1;
private Object tag = null;
private Rect bounds = null;
public Rect getBounds() {
return bounds;
}
public BaseView() {
bounds = new Rect();
}
public BaseView(int x, int y, int width, int height) {
bounds = new Rect(x, y, x + width, y + height);
}
public abstract void onDraw(Canvas canvas);
public abstract boolean onTouchEvent(MotionEvent event);
public void setBounds(int x, int y, int width, int height){
bounds.set(x, y, x + width, y + height);
}
public void setPosition(int x, int y){
if(x <= 0 || y <= 0){
Log.e("SimpEditText1", "----------------------------------------------------------");
Log.e("SimpEditText1", "-------------0000000000000000000000000000000000------------");
Log.e("SimpEditText1", "----------------------------------------------------------");
}
bounds.set(x, y, x + bounds.width(), y + bounds.height());
}
public void setScale(int x,int y,int width,int height){
bounds.set(x, y, width,height);
}
protected boolean isTouchedInBounds(int xPos, int yPos){
return bounds.contains(xPos, yPos);
}
public Object getTag() {
return tag;
}
public void setTag(Object tag) {
this.tag = tag;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
/**
* @param w
* @param h
* @param oldw
* @param oldh
*/
}
请告诉我代码中的错误。
答案 0 :(得分：1)