安卓：查找缩放（使用捏用矩阵布局进行缩放）后ImageView的绝对点击位置缩放、矩阵、布局、位置
2023-09-05 08:56:51
作者：解脱i
我正在使用的Android你好，对于捏放大功能第三版发现code。使用这个捏放大优良工程后，但放大后，我想要得到的图像视图绝对的点击位置。
下面是我的code
包org.example.touch;
进口android.app.Activity;
进口android.graphics.Bitmap;
进口android.graphics.Matrix;
进口android.graphics.PointF;
进口android.os.Bundle;
进口android.util.FloatMath;
进口android.util.Log;
进口android.view.MotionEvent;
进口android.view.View;
进口android.view.View.OnTouchListener;
进口android.widget.GridView;
进口android.widget.ImageView;
公共类触摸扩展活动实现OnTouchListener {
私有静态最后字符串变量=触摸;
私有静态最终浮动MIN_ZOOM = 1.0F;
私有静态最终浮动MAX_ZOOM = 5.0F;
//这些矩阵将用于移动和放大图像
字模=新的Matrix（）;
矩阵savedMatrix =新的Matrix（）;
//我们可以在这3个状态之一
静态最终诠释无= 0;
静态最终诠释DRAG = 1;
静态最终诠释ZOOM = 2;
INT模式=无;
//记住一些东西放大
的PointF开始=新的PointF（）;
的PointF中期=新的PointF（）;
浮oldDist = 1F;
ImageView的IMAGE2;
IMAGE2 =（ImageView的）this.findViewById（R.id.imageView2）;
image2.setOnTouchListener（新OnTouchListener（）{
公共布尔onTouch（视图V，MotionEvent事件）{
ImageView的观点=（ImageView的）IMAGE2;
//这里处理触摸事件...
开关（event.getAction（）及MotionEvent.ACTION_MASK）{
案例MotionEvent.ACTION_DOWN：
savedMatrix.set（矩阵）;
start.set（event.getX（），event.getY（））;
模式=阻力;
打破;
案例MotionEvent.ACTION_POINTER_DOWN：
oldDist =间距（事件）;
如果（oldDist＆GT; 10F）{
savedMatrix.set（矩阵）;
中点（中，事件）;
模式=变焦;
}
打破;
案例MotionEvent.ACTION_UP：
案例MotionEvent.ACTION_POINTER_UP：
模式=无;
打破;
案例MotionEvent.ACTION_MOVE：
如果（模式==拖动）{
matrix.set（savedMatrix）;
matrix.postTranslate（event.getX（） - start.x，event.getY（） - start.y）;
}
否则，如果（模式==变焦）{
浮newDist =间距（事件）;
如果（newDist＆GT; 10F）{
matrix.set（savedMatrix）;
浮规模= newDist / oldDist;
matrix.postScale（规模化，规模化，mid.x，mid.y）;
}
}
打破;
}
view.setImageMatrix（矩阵）;
}
/ **确定第一两个手指之间的空间* /
私人浮动间距（MotionEvent事件）{
浮X = event.getX（0） - event.getX（1）;
浮Y = event.getY（0） - event.getY（1）;
返回FloatMath.sqrt（X * X + Y * Y）;
}
/ **计算前两个手指的中点* /
私人无效中点（的PointF点，MotionEvent事件）{
浮X = event.getX（0）+ event.getX（1）;
浮Y = event.getY（0）+ event.getY（1）;
point.set（X / 2，Y / 2）;
}
解决方案 
您可以使用当前应用到的ImageView来分从原来的默认点映射到/矩阵。
从触摸//分/点击放大/转换ImageView的事件
浮动X;
浮动Ÿ;
浮initialPoints =新的浮动[] {X，Y};
//反转矩阵和地图点回
如果（transformMatrix.invert（inverseTransformMatrix））
inverseTransformMatrix.mapPoints（initialFocalPoints）;
initialPoints 现在包含原始点，即其中点击点是，如果没有矩阵施加到imageview的
修改：应该在里面添加了这个地方，所以你知道他们是什么
矩阵inverseTransformMatrix =新的Matrix（）;
矩阵transformMatrix =新的Matrix（）;
I am using code found in Hello Android, 3rd Edition for Pinch to Zoom functionality. After using this the pinch to zoom works fine, but after zooming i want to get the absolute click position on the image view.
Here is my code
package org.example.touch;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.GridView;
import android.widget.ImageView;
public class Touch extends Activity implements OnTouchListener {
private static final String TAG = "Touch";
private static final float MIN_ZOOM = 1.0f;
private static final float MAX_ZOOM = 5.0f;
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = 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;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
ImageView image2;
image2 = (ImageView)this.findViewById(R.id.imageView2);
image2.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
ImageView view = (ImageView) image2;
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
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) {
float newDist = spacing(event);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix);
}
/** Determine the space between the first two fingers */
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);
}
/** Calculate the mid point of the first two fingers */
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);
}
解决方案
You can use the matrix that is currently applied to the imageview to map points to/from the original default points.
//points from a touch/click event on the zoomed/translated imageview
float X;
float Y;
float initialPoints = new float[]{X, Y};
//invert the matrix and map points back
if(transformMatrix.invert(inverseTransformMatrix))
inverseTransformMatrix.mapPoints(initialFocalPoints);
initialPoints now contains the original points, i.e where the click point would be if no matrix was applied to the imageview
EDIT: should have added this in there somewhere so you know what they are.
Matrix inverseTransformMatrix = new Matrix();
Matrix transformMatrix = new Matrix();
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