如何将图像恢复到原来的位置 [英] How to reset an image to the original position
本文介绍了如何将图像恢复到原来的位置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用可用的TouchImageView类在 https://github.com/MikeOrtiz/TouchImageView
我使用这个类来把一个放大和缩小功能，以我的形象问题是下一个，
当我改变TouchImageView它仍然有变焦和最后图像的位置，我想只是将其重置为初始位置什么的图像而没有任何缩放
这可能吗？
这是类
包com.example.touch;进口android.content.Context;
进口android.graphics.Matrix;
进口android.graphics.PointF;
进口android.graphics.drawable.Drawable;
进口android.util.AttributeSet;
进口android.util.Log;
进口android.view.MotionEvent;
进口android.view.ScaleGestureDetector;
进口android.view.View;
进口android.widget.ImageView;公共类TouchImageView扩展了ImageView的{矩阵矩阵;//我们可以在这3个国家之一
静态最终诠释NONE = 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
去年的PointF =新的PointF（）;
的PointF开始=新的PointF（）;
浮minScale = 1F;
浮maxScale = 3F;
浮动[]米;
INT viewWidth，viewHeight;
静态最终诠释CLICK = 3;
浮saveScale = 1F;
保护浮球origWidth，origHeight;
INT oldMeasuredWidth，oldMeasuredHeight;
ScaleGestureDetector mScaleDetector;上下文语境;公共TouchImageView（上下文的背景下）{
超级（上下文）;
sharedConstructing（上下文）;
}公共TouchImageView（上下文的背景下，ATTRS的AttributeSet）{
超（背景下，ATTRS）;
sharedConstructing（上下文）;
}私人无效sharedConstructing（上下文的背景下）{
super.setClickable（真）;
this.context =背景;
mScaleDetector =新ScaleGestureDetector（上下文，新ScaleListener（））;
矩阵=新的Matrix（）;
M =新的浮动[9];
setImageMatrix（矩阵）;
setScaleType（ScaleType.MATRIX）; setOnTouchListener（新OnTouchListener（）{ @覆盖
公共布尔onTouch（视图V，MotionEvent事件）{
mScaleDetector.onTouchEvent（事件）;
的PointF CURR =新的PointF（event.getX（），event.getY（））; 开关（event.getAction（））{
案例MotionEvent.ACTION_DOWN：
last.set（CURR）;
start.set（最后）;
模式= DRAG;
打破; 案例MotionEvent.ACTION_MOVE：
如果（==模式拖动）{
浮DELTAX = curr.x - last.x;
浮DELTAY = curr.y - last.y;
浮fixTransX = getFixDragTrans（DELTAX，viewWidth，origWidth * saveScale）;
浮fixTransY = getFixDragTrans（DELTAY，viewHeight，origHeight * saveScale）;
matrix.postTranslate（fixTransX，fixTransY）;
fixTrans（）;
last.set（curr.x，curr.y）;
}
打破; 案例MotionEvent.ACTION_UP：
模式=无;
INT xDiff =（INT）Math.abs（curr.x - start.x）;
INT yDiff =（INT）Math.abs（curr.y - start.y）;
如果（xDiff＆LT;单击＆放大器;＆安培; yDiff＆LT;点击）
performClick（）;
打破; 案例MotionEvent.ACTION_POINTER_UP：
模式=无;
打破;
} setImageMatrix（矩阵）;
无效（）;
返回true; //表示事件已处理
} }）;
}公共无效setMaxZoom（浮X）{
maxScale = X;
}私有类ScaleListener扩展ScaleGestureDetector.SimpleOnScaleGestureListener {
@覆盖
公共布尔onScaleBegin（ScaleGestureDetector检测器）{
模式= ZOOM;
返回true;
} @覆盖
公共布尔onScale（ScaleGestureDetector检测器）{
浮mScaleFactor = detector.getScaleFactor（）;
浮origScale = saveScale;
saveScale * = mScaleFactor;
如果（saveScale＆GT; maxScale）{
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
}否则如果（saveScale＆LT; minScale）{
saveScale = minScale;
mScaleFactor = minScale / origScale;
} 如果（origWidth * saveScale＆LT; = || viewWidth * origHeight＆saveScale LT = viewHeight）
matrix.postScale（mScaleFactor，mScaleFactor，viewWidth / 2，viewHeight / 2）;
其他
matrix.postScale（mScaleFactor，mScaleFactor，detector.getFocusX（），detector.getFocusY（））; fixTrans（）;
返回true;
}
}无效fixTrans（）{
matrix.getValues（米）;
浮transX = M [Matrix.MTRANS_X]
浮transY = M [Matrix.MTRANS_Y] 浮fixTransX = getFixTrans（transX，viewWidth，origWidth * saveScale）;
浮fixTransY = getFixTrans（transY，viewHeight，origHeight * saveScale）; 如果（fixTransX！= 0 || fixTransY！= 0）
matrix.postTranslate（fixTransX，fixTransY）;
}浮动getFixTrans（反式浮动，浮动viewSize，浮contentSize）{
浮minTrans，MAXTRANS; 如果（contentSize＆LT; = viewSize）{
minTrans = 0;
MAXTRANS = viewSize - contentSize;
}其他{
minTrans = viewSize - contentSize;
MAXTRANS = 0;
} 如果（反式LT; minTrans）
返回 - 反+ minTrans;
如果（反式GT; MAXTRANS）
返回 - 反+ MAXTRANS;
返回0;
}浮getFixDragTrans（浮动三角洲，浮viewSize，浮contentSize）{
如果（contentSize＆LT; = viewSize）{
返回0;
}
返回三角洲;
}@覆盖
保护无效onMeasure（INT widthMeasureSpec，诠释heightMeasureSpec）{
super.onMeasure（widthMeasureSpec，heightMeasureSpec）;
viewWidth = MeasureSpec.getSize（widthMeasureSpec）;
viewHeight = MeasureSpec.getSize（heightMeasureSpec）; //
//在重新缩放旋转图片
//
如果（oldMeasuredHeight == viewWidth＆放大器;＆安培; oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0）
返回;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth; 如果（saveScale == 1）{
//适应屏幕。
浮规模; 可绘制可绘制= getDrawable（）;
如果（绘== NULL || drawable.getIntrinsicWidth（）== 0 || drawable.getIntrinsicHeight（）== 0）
返回;
INT bmWidth = drawable.getIntrinsicWidth（）;
INT bmHeight = drawable.getIntrinsicHeight（）; Log.d（bmSize，bmWidth：+ bmWidth +bmHeight：+ bmHeight）; 漂浮的scaleX =（浮点）viewWidth /（浮点）bmWidth;
漂浮的scaleY =（浮点）viewHeight /（浮点）bmHeight;
规模= Math.min（将scaleX，的scaleY）;
matrix.setScale（秤，秤）; //中心图像
浮动redundantYSpace =（浮点）viewHeight - （*规模（浮点）bmHeight）;
浮动redundantXSpace =（浮点）viewWidth - （*规模（浮点）bmWidth）;
redundantYSpace / =（浮点）2;
redundantXSpace / =（浮点）2; matrix.postTranslate（redundantXSpace，redundantYSpace）; origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix（矩阵）;
}
fixTrans（）;
}
}
解决方案
问题解决了，只需添加此功能的库
公共无效reiniciarZoom（）
{
矩阵=新的Matrix（originalMatrix）;
saveScale = 1F;
setImageMatrix（矩阵）;
无效（）;
}
和调用它，你要放置IMG原来的IMG每次
I am using the TouchImageView class available at https://github.com/MikeOrtiz/TouchImageView
I use this class to put a zoom-in and zoom-out to my image the problem is the next one,
When i change the image of the TouchImageView it still have the zoom and the position of the last image and what i want is just reset it to the initial position without any zoom
is that possible?
this is the class
package com.example.touch;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.ImageView;
public class TouchImageView extends ImageView {
Matrix 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 last = new PointF();
PointF start = new PointF();
float minScale = 1f;
float maxScale = 3f;
float[] m;
int viewWidth, viewHeight;
static final int CLICK = 3;
float saveScale = 1f;
protected float origWidth, origHeight;
int oldMeasuredWidth, oldMeasuredHeight;
ScaleGestureDetector mScaleDetector;
Context context;
public TouchImageView(Context context) {
super(context);
sharedConstructing(context);
}
public TouchImageView(Context context, AttributeSet attrs) {
super(context, attrs);
sharedConstructing(context);
}
private void sharedConstructing(Context context) {
super.setClickable(true);
this.context = context;
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
matrix = new Matrix();
m = new float[9];
setImageMatrix(matrix);
setScaleType(ScaleType.MATRIX);
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleDetector.onTouchEvent(event);
PointF curr = new PointF(event.getX(), event.getY());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
last.set(curr);
start.set(last);
mode = DRAG;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
float deltaX = curr.x - last.x;
float deltaY = curr.y - last.y;
float fixTransX = getFixDragTrans(deltaX, viewWidth, origWidth * saveScale);
float fixTransY = getFixDragTrans(deltaY, viewHeight, origHeight * saveScale);
matrix.postTranslate(fixTransX, fixTransY);
fixTrans();
last.set(curr.x, curr.y);
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
int xDiff = (int) Math.abs(curr.x - start.x);
int yDiff = (int) Math.abs(curr.y - start.y);
if (xDiff < CLICK && yDiff < CLICK)
performClick();
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
break;
}
setImageMatrix(matrix);
invalidate();
return true; // indicate event was handled
}
});
}
public void setMaxZoom(float x) {
maxScale = x;
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
mode = ZOOM;
return true;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
float mScaleFactor = detector.getScaleFactor();
float origScale = saveScale;
saveScale *= mScaleFactor;
if (saveScale > maxScale) {
saveScale = maxScale;
mScaleFactor = maxScale / origScale;
} else if (saveScale < minScale) {
saveScale = minScale;
mScaleFactor = minScale / origScale;
}
if (origWidth * saveScale <= viewWidth || origHeight * saveScale <= viewHeight)
matrix.postScale(mScaleFactor, mScaleFactor, viewWidth / 2, viewHeight / 2);
else
matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
fixTrans();
return true;
}
}
void fixTrans() {
matrix.getValues(m);
float transX = m[Matrix.MTRANS_X];
float transY = m[Matrix.MTRANS_Y];
float fixTransX = getFixTrans(transX, viewWidth, origWidth * saveScale);
float fixTransY = getFixTrans(transY, viewHeight, origHeight * saveScale);
if (fixTransX != 0 || fixTransY != 0)
matrix.postTranslate(fixTransX, fixTransY);
}
float getFixTrans(float trans, float viewSize, float contentSize) {
float minTrans, maxTrans;
if (contentSize <= viewSize) {
minTrans = 0;
maxTrans = viewSize - contentSize;
} else {
minTrans = viewSize - contentSize;
maxTrans = 0;
}
if (trans < minTrans)
return -trans + minTrans;
if (trans > maxTrans)
return -trans + maxTrans;
return 0;
}
float getFixDragTrans(float delta, float viewSize, float contentSize) {
if (contentSize <= viewSize) {
return 0;
}
return delta;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);
viewHeight = MeasureSpec.getSize(heightMeasureSpec);
//
// Rescales image on rotation
//
if (oldMeasuredHeight == viewWidth && oldMeasuredHeight == viewHeight
|| viewWidth == 0 || viewHeight == 0)
return;
oldMeasuredHeight = viewHeight;
oldMeasuredWidth = viewWidth;
if (saveScale == 1) {
//Fit to screen.
float scale;
Drawable drawable = getDrawable();
if (drawable == null || drawable.getIntrinsicWidth() == 0 || drawable.getIntrinsicHeight() == 0)
return;
int bmWidth = drawable.getIntrinsicWidth();
int bmHeight = drawable.getIntrinsicHeight();
Log.d("bmSize", "bmWidth: " + bmWidth + " bmHeight : " + bmHeight);
float scaleX = (float) viewWidth / (float) bmWidth;
float scaleY = (float) viewHeight / (float) bmHeight;
scale = Math.min(scaleX, scaleY);
matrix.setScale(scale, scale);
// Center the image
float redundantYSpace = (float) viewHeight - (scale * (float) bmHeight);
float redundantXSpace = (float) viewWidth - (scale * (float) bmWidth);
redundantYSpace /= (float) 2;
redundantXSpace /= (float) 2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
origWidth = viewWidth - 2 * redundantXSpace;
origHeight = viewHeight - 2 * redundantYSpace;
setImageMatrix(matrix);
}
fixTrans();
}
}
解决方案
Problem solved, just add this function to the library
public void reiniciarZoom()
{
matrix = new Matrix(originalMatrix);
saveScale = 1f;
setImageMatrix(matrix);
invalidate();
}
and call it every time you want to place your img to the original img
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