Android 正在更新托管可绘制对象的onTouchEvent ImageView类中的缩放参数
我能够使用一个StackOverflow用户创建的类来满足我的需要。 该类工作正常,但不包括滚动(垂直、水平)。I修改了下面的类,在MotionEvent.Action\u Up下面添加了代码,现在它提供了水平和垂直滚动我遇到的主要问题是缩放模式 如果仔细观察,缩放模式发生在MotionEvent.ACTION\u POINTER\u DOWN上: 逻辑是,它计算两个手指之间的距离,并通过中点法计算出它们之间的中点。缩放的中心必须在此中点。MotionEvent.ACTION\u POINTER\u DOWN下的代码负责 保存和缩放矩阵 这个类是一个ImageView,它承载一个可绘制的图形。图形绘制得很好,水平和垂直滚动现在已启用,但缩放会导致问题:当可绘制文件加载并尝试缩放时,效果很好,但如果之后尝试滚动,可绘制文件将在视图中丢失。同样地,当我先滚动然后缩放时,可绘制图形很快就会在视图中消失。看起来矩阵改变了ImageView坐标,因此中点不是我需要的缩放原点 在可绘制类onDraw()中,我实现了以下逻辑:Android 正在更新托管可绘制对象的onTouchEvent ImageView类中的缩放参数,android,matrix,imageview,drawable,touch-event,Android,Matrix,Imageview,Drawable,Touch Event,我能够使用一个StackOverflow用户创建的类来满足我的需要。 该类工作正常,但不包括滚动(垂直、水平)。I修改了下面的类,在MotionEvent.Action\u Up下面添加了代码,现在它提供了水平和垂直滚动我遇到的主要问题是缩放模式 如果仔细观察,缩放模式发生在MotionEvent.ACTION\u POINTER\u DOWN上: 逻辑是,它计算两个手指之间的距离,并通过中点法计算出它们之间的中点。缩放的中心必须在此中点。MotionEvent.ACTION\u POINTER
canvas.save();
GraphImage.translateX = GraphImage.translateX + MainActivity.keeper14;
GraphImage.translateY = GraphImage.translateY + MainActivity.keeper15;
canvas.translate(GraphImage.translateX, GraphImage.translateY);
canvas.scale(GraphImage.main_scale, GraphImage.main_scale, MainActivity.middy.x , MainActivity.middy.y);
//do my draw calls here
MainActivity.keeper14 = GraphImage.translateX;
MainActivity.keeper15 = GraphImage.translateY;
canvas.restore();
如您所见,我使用ImageView onTouch方法中更新的值。
我认为问题可能在于矩阵与
scale()和canvas.translate()调用
这是ImageView类。顺便问一下,这个类中矩阵的用途是什么。它是否仅适用于ImageView,还是也适用于它所具有的可绘图功能?此外,我在这个视图中使用scaleType=Matrix
public class GraphImage extends android.support.v7.widget.AppCompatImageView {
Paint paint;
Context c;
int color;
Matrix matrix;
Matrix savedMatrix;
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
static PointF start,mid;
float oldDist;
static float main_scale;
static float translateX,translateY;
String savedItemClicked;
String TAG = "Batman";
float mx , my, curX, curY;
public GraphImage(Context context, AttributeSet attrs) {
super(context,attrs);
//all the variables are init here
setFocusable(true);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mx = event.getX();
my = event.getY();
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(MainActivity.middy, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
curX = event.getX();
curY = event.getY();
matrix.set(savedMatrix);
matrix.postTranslate(curX - mx, curY - my);
translateX = curX - mx;//event.getX() - start.x;
translateY = curY - my;//event.getY() - start.y;
this.invalidateDrawable(this.getDrawable());
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
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);
translateX = event.getX() - start.x;
translateY = event.getY() - start.y;
this.invalidateDrawable(this.getDrawable());
*/
} else
if (mode == ZOOM) {
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
main_scale = scale;
matrix.postScale(scale, scale, MainActivity.middy.x, MainActivity.middy.y);
this.invalidateDrawable(this.getDrawable());
}
}
break;
}
this.setImageMatrix(matrix);
//invalidate();
return true;
}
/** Determine the space between the first two fingers */
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);// Math.abs(event.getX() - mx);//event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);//Math.abs(event.getY() - my);//event.getY(0) - event.getY(1);
return (float)Math.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);//mx + event.getX();//event.getX(0) + event.getX(1);//
float y = event.getY(0) + event.getY(1);//my + event.getY();//event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
MainActivity.middy = point;
}
private void dumpEvent(MotionEvent 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());
}
公共类GraphImage扩展了android.support.v7.widget.AppCompatImageView{
油漆;
上下文c;
内色;
矩阵;
矩阵保存矩阵;
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;
静态点F开始,中间;
浮动oldDist;
静态浮动主刻度;
静态浮动translateX,translateY;
字符串savedItemClicked;
String TAG=“蝙蝠侠”;
浮动mx,my,curX,curY;
公共图形(上下文、属性集属性){
超级(上下文,attrs);
//所有变量在这里都是init
设置聚焦(真);
}
@凌驾
公共布尔onTouchEvent(运动事件){
dumpEvent(事件);
//在这里处理触摸事件。。。
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
mx=event.getX();
my=event.getY();
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(主要活动、中午、事件);
模式=缩放;
Log.d(标记“mode=ZOOM”);
}
打破
case MotionEvent.ACTION\u UP:
curX=event.getX();
curY=event.getY();
矩阵集(savedMatrix);
后翻译(curX-mx,curY-my);
translateX=curX-mx;//event.getX()-start.x;
translateY=curY-my;//event.getY()-start.y;
this.invalidateDrawable(this.getDrawable());
打破
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:
如果(模式==拖动){
// ...
/*
矩阵集(savedMatrix);
postTranslate(event.getX()-start.x,event.getY())
-开始(y);
translateX=event.getX()-start.x;
translateY=event.getY()-start.y;
this.invalidateDrawable(this.getDrawable());
*/
}否则
如果(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;
主刻度=刻度;
后量表(量表,量表,主要活动量表,中间量表x,主要活动量表,中间量表y);
this.invalidateDrawable(this.getDrawable());
}
}
打破
}
此.setImageMatrix(矩阵);
//使无效();
返回true;
}
/**确定前两个手指之间的间距*/
专用浮动间距(MotionEvent事件){
float x=event.getX(0)-event.getX(1);//Math.abs(event.getX()-mx);//event.getX(0)-event.getX(1);
float y=event.getY(0)-event.getY(1);//Math.abs(event.getY()-my);//event.getY(0)-event.getY(1);
返回(浮点)数学sqrt(x*x+y*y);
}
/**计算前两个手指的中点*/
专用空心中点(点F点、MotionEvent事件){
float x=event.getX(0)+event.getX(1);//mx+event.getX();//event.getX(0)+event.getX(1)//
float y=event.getY(0)+event.getY(1);//my+event.getY();//event.getY(0)+event.getY(1);
点集(x/2,y/2);
MainActivity.middy=点;
}
私有void转储事件(MotionEvent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(事件动作)
translationXX = translationXX + (curX - mx); //Likewise for translationYY
canvas.translate(MainActivity.translationXX , MainActivity.translationYY);// inside onDraw of the drawable
MainActivity.middy = point;
mid = point;
canvas.scale(MainActivity.drawing_scale, MainActivity.drawing_scale, GraphImage.mid.x,GraphImage.mid.y);//MainActivity.drawing_scale was updated when the mode was ZOOM inside the onTouch method of GraphImage
MainActivity.middy = mid; //this line was called on ACTION_MOVE when the mode = ZOOM
matrix.postScale(MainActivity.drawing_scale, MainActivity.drawing_scale,MainActivity.middy.x,MainActivity.middy.y)//middy was updated with the latest midpoint "mid" on a previous called to ZOOM inside ACTION_MOVE