在android中使用多点触摸进行旋转和缩放
我想在多点触控事件中旋转和缩放图像, 我可以拖动、缩放图像,但我无法理解图像的旋转。 我正面临问题,请尽快帮助我。 我的密码在那里在android中使用多点触摸进行旋转和缩放,android,android-imageview,android-gesture,Android,Android Imageview,Android Gesture,我想在多点触控事件中旋转和缩放图像, 我可以拖动、缩放图像,但我无法理解图像的旋转。 我正面临问题,请尽快帮助我。 我的密码在那里 public class Touch extends Activity implements OnTouchListener { private static final String TAG = "Touch"; // These matrices will be used to move and zoom image
public class Touch extends Activity implements OnTouchListener {
private static final String TAG = "Touch";
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix matrix1 = new Matrix();
Matrix savedMatrix = new Matrix();
Matrix savedMatrix2 = new Matrix();
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
float oldscale =0;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView view = (ImageView) findViewById(R.id.imageView2);
view.setOnTouchListener(this);
ImageView view1 = (ImageView) findViewById(R.id.imageView2);
view1.setOnTouchListener(this);
// ...
// Work around a Cupcake bug
matrix.setTranslate(1f, 1f);
matrix1.setTranslate(1f, 1f);
view.setImageMatrix(matrix);
view1.setImageMatrix(matrix1);
}
@Override
public boolean onTouch(View v, MotionEvent rawEvent) {
WrapMotionEvent event = WrapMotionEvent.wrap(rawEvent);
// ...
ImageView view = (ImageView) v;
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
double r = Math.atan2(event.getX() - 400 / 2,
400 / 2 - event.getY());
int rotation = (int) Math.toDegrees(r);
float newRot = new Float(rotation);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
matrix.postRotate(15);
if (mode == DRAG) {
// ...
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x,
event.getY() - start.y);
}
else if (mode == ZOOM) {
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
Log.e("scale | mid.x | mid.y", scale + " " +mid.x + " " + mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(WrapMotionEvent event) {
// ...
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
"POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid ").append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d(TAG, sb.toString());
}
/** Determine the space between the first two fingers */
private float spacing(WrapMotionEvent event) {
// ...
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
/** Calculate the mid point of the first two fingers */
private void midPoint(PointF point, WrapMotionEvent event) {
// ...
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
}
public类Touch扩展了活动实现到TouchListener上{
私有静态最终字符串TAG=“Touch”;
//这些矩阵将用于移动和缩放图像
矩阵=新矩阵();
矩阵matrix1=新矩阵();
矩阵savedMatrix=新矩阵();
矩阵savedMatrix=新矩阵();
//我们可能处于这三种状态之一
静态最终int NONE=0;
静态最终整数阻力=1;
静态最终整数缩放=2;
int模式=无;
浮动比例=0;
//记住一些关于缩放的事情
PointF start=新的PointF();
PointF mid=新的PointF();
浮动oldDist=1f;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView=(ImageView)findViewById(R.id.imageView2);
view.setOnTouchListener(这个);
ImageView视图1=(ImageView)findViewById(R.id.imageView2);
视图1.setOnTouchListener(此);
// ...
//对付纸杯蛋糕虫
矩阵.setTranslate(1f,1f);
matrix1.setTranslate(1f,1f);
视图.setImageMatrix(矩阵);
视图1.setImageMatrix(matrix1);
}
@凌驾
公共布尔onTouch(视图v、MotionEvent和rawEvent){
WrapMotionEvent=WrapMotionEvent.wrap(rawEvent);
// ...
ImageView视图=(ImageView)v;
//将触摸事件转储到日志
dumpEvent(事件);
//在这里处理触摸事件。。。
double r=Math.atan2(event.getX()-400/2,
400/2-event.getY();
int旋转=(int)数学toDegrees(r);
浮动新旋转=新浮动(旋转);
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
savedMatrix.set(矩阵);
set(event.getX(),event.getY());
Log.d(标记“mode=DRAG”);
模式=拖动;
打破
case MotionEvent.ACTION\u指针\u向下:
oldDist=间距(事件);
Log.d(标记“oldDist=“+oldDist”);
如果(旧区>10f){
savedMatrix.set(矩阵);
中点(中点,事件);
模式=缩放;
Log.d(标记“mode=ZOOM”);
}
打破
case MotionEvent.ACTION\u UP:
case MotionEvent.ACTION\u指针\u向上:
模式=无;
Log.d(标记“mode=NONE”);
打破
case MotionEvent.ACTION\u移动:
矩阵旋转后(15);
如果(模式==拖动){
// ...
矩阵集(savedMatrix);
postTranslate(event.getX()-start.x,
event.getY()-start.y);
}
else if(模式==缩放){
float newDist=间距(事件);
Log.d(标记“newDist=“+newDist”);
如果(新距离>10f){
矩阵集(savedMatrix);
浮动比例=新距离/旧距离;
矩阵。后标度(标度、标度、中x、中y);
Log.e(“比例| mid.x | mid.y”,比例+“”+mid.x+“”+mid.y);
}
}
打破
}
视图.setImageMatrix(矩阵);
返回true;//指示事件已处理
}
/**在LogCat视图中显示事件以进行调试*/
私有void dumpEvent(WrapMotionEvent事件){
// ...
字符串名称[]={“向下”、“向上”、“移动”、“取消”、“外部”,
“指针向下”、“指针向上”、“7?”、“8?”、“9?”;
StringBuilder sb=新的StringBuilder();
int action=event.getAction();
int actionCode=action&MotionEvent.action\u掩码;
附加(名称[动作代码]);
如果(actionCode==MotionEvent.ACTION\u指针\u向下
||actionCode==MotionEvent.ACTION(指针向上){
某人追加(“(pid”)。追加(
动作>>MotionEvent.action\u指针\u ID\u移位);
某人加上(“)”;
}
某人加上(“[”);
for(int i=0;i
所以请为我提供这个问题的精确解决方案
float[] lastEvent = null;
float d = 0f;
float newRot = 0f;
@Override
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) v;
// Dump touch event to log
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
if (Constant.TRACE) Log.d(TAG, "mode=DRAG");
mode = DRAG;
lastEvent = null;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
if (Constant.TRACE) Log.d(TAG, "mode=ZOOM");
lastEvent = new float[4];
lastEvent[0] = event.getX(0);
lastEvent[1] = event.getX(1);
lastEvent[2] = event.getY(0);
lastEvent[3] = event.getY(1);
d = rotation(event);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
lastEvent = null;
if (Constant.TRACE) Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
// ...
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
}
else if (mode == ZOOM && event.getPointerCount()==2) {
float newDist = spacing(event);
if (Constant.TRACE) Log.d(TAG, "Count=" + event.getPointerCount());
if (Constant.TRACE) Log.d(TAG, "newDist=" + newDist);
matrix.set(savedMatrix);
if (newDist > 10f) {
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
if (lastEvent!=null){
newRot = rotation(event);
if (Constant.TRACE) Log.d("Degreeeeeeeeeee", "newRot="+(newRot));
float r = newRot-d;
matrix.postRotate(r, imgView.getMeasuredWidth()/2, imgView.getMeasuredHeight()/2);
}
}
break;
}
view.setImageMatrix(matrix);
return true; // indicate event was handled
}
请尝试此代码,但请记住一些旧手机在旋转方面有问题。我尝试了上述代码。这很好,但图像没有绕其自身的轴旋转,它需要绕其中心点旋转,但由于缩放,它显示在错误的位置。如何找到它的相对坐标。@strike,您可以保存图像的当前平移并计算中心点。不要忘记缩放。为什么该代码在所有手机中都不起作用?我试过Nexus4,它可以用,但Nexus1不行。
/** Determine the degree between the first two fingers */
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);
if (Constant.TRACE) Log.d("Rotation ~~~~~~~~~~~~~~~~~", delta_x+" ## "+delta_y+" ## "+radians+" ## "
+Math.toDegrees(radians));
return (float) Math.toDegrees(radians);
}