缩放后获取位图像素的颜色
我希望触摸Image的像素颜色。我设法从我的位图获取像素颜色。但这里的问题是当我缩放图像时，它每次都会返回白色。我没有得到正确的像素值。我的确切要求是使图像可点击。我在一个帧中有两个图像，第二个图像将是不可见的，我想要获得点击颜色。我的想法是让第二个图像的像素在我的应用程序中进一步导航。
我正在附加我要点击
我正在使用zoomlayout代码：
public class ZoomLayout extends FrameLayout implements ScaleGestureDetector.OnScaleGestureListener {
private enum Mode {
NONE,
DRAG,
ZOOM
}
private static final String TAG = "ZoomLayout";
private static final float MIN_ZOOM = 1.0f;
private static final float MAX_ZOOM = 16.0f;
private Mode mode = Mode.NONE;
private float scale = 1.0f;
private float lastScaleFactor = 0f;
// Where the finger first touches the screen
private float startX = 0f;
private float startY = 0f;
// How much to translate the canvas
private float dx = 0f;
private float dy = 0f;
private float prevDx = 0f;
private float prevDy = 0f;
public ZoomLayout(Context context) {
super(context);
init(context);
}
public ZoomLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ZoomLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
final ScaleGestureDetector scaleDetector = new ScaleGestureDetector(context, this);
this.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
float eventX = motionEvent.getX();
float eventY = motionEvent.getY();
float[] eventXY = new float[]{eventX, eventY};
Matrix invertMatrix = new Matrix();
((ImageView) getChildAt(1)).getImageMatrix().invert(invertMatrix);
invertMatrix.mapPoints(eventXY);
int x = Integer.valueOf((int) eventXY[0]);
int y = Integer.valueOf((int) eventXY[1]);
Log.e("image x", "===img ki x==" + x);
Log.e("image y", "===img ki y==" + y);
Drawable imgDrawable = ((ImageView) getChildAt(1)).getDrawable();
Bitmap bitmap = ((BitmapDrawable) imgDrawable).getBitmap();
// int color_value= getHitboxColour(x,y,(ImageView) getChildAt(0));
//Limit x, y range within bitmap
if (x < 0) {
x = 0;
} else if (x > bitmap.getWidth() - 1) {
x = bitmap.getWidth() - 1;
}
if (y < 0) {
y = 0;
} else if (y > bitmap.getHeight() - 1) {
y = bitmap.getHeight() - 1;
}
//Log.e("touched color: ", "" + "#" + Integer.toHexString(color_value));
int touchedRGB = bitmap.getPixel(x, y);
int redValue = Color.red(touchedRGB);
int blueValue = Color.blue(touchedRGB);
int greenValue = Color.green(touchedRGB);
Log.e("touched color: ", "" + "#" + Integer.toHexString(touchedRGB));
Log.i(TAG, "DOWN");
if (scale > MIN_ZOOM) {
mode = Mode.DRAG;
startX = motionEvent.getX() - prevDx;
startY = motionEvent.getY() - prevDy;
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == Mode.DRAG) {
dx = motionEvent.getX() - startX;
dy = motionEvent.getY() - startY;
}
break;
case MotionEvent.ACTION_POINTER_DOWN:
mode = Mode.ZOOM;
break;
case MotionEvent.ACTION_POINTER_UP:
mode = Mode.DRAG;
break;
case MotionEvent.ACTION_UP:
Log.i(TAG, "UP");
mode = Mode.NONE;
prevDx = dx;
prevDy = dy;
break;
}
scaleDetector.onTouchEvent(motionEvent);
/* if ((mode == Mode.DRAG && scale >= MIN_ZOOM) || mode == Mode.ZOOM) {
getParent().requestDisallowInterceptTouchEvent(true);
float maxDx = (child().getWidth() - (child().getWidth() / scale)) / 2 * scale;
float maxDy = (child().getHeight() - (child().getHeight() / scale)) / 2 * scale;
dx = Math.min(Math.max(dx, -maxDx), maxDx);
dy = Math.min(Math.max(dy, -maxDy), maxDy);
Log.i(TAG, "Width: " + child().getWidth() + ", scale " + scale + ", dx " + dx
+ ", max " + maxDx);
applyScaleAndTranslation();
}*/
if (( scale >= MIN_ZOOM) || mode == Mode.ZOOM) {
getParent().requestDisallowInterceptTouchEvent(true);
float maxDx = (child().getWidth() - (child().getWidth() / scale)) / 2 * scale;
float maxDy = (child().getHeight() - (child().getHeight() / scale)) / 2 * scale;
dx = Math.min(Math.max(dx, -maxDx), maxDx);
dy = Math.min(Math.max(dy, -maxDy), maxDy);
Log.i(TAG, "Width: " + child().getWidth() + ", scale " + scale + ", dx " + dx
+ ", max " + maxDx);
// applyScaleAndTranslation();
child().setScaleX(scale);
child().setScaleY(scale);
float maxDx1 = (child2().getWidth() - (child2().getWidth() / scale)) / 2 * scale;
float maxDy1 = (child2().getHeight() - (child2().getHeight() / scale)) / 2 * scale;
dx = Math.min(Math.max(dx, -maxDx1), maxDx1);
dy = Math.min(Math.max(dy, -maxDy1), maxDy1);
Log.i(TAG, "Width: " + child2().getWidth() + ", scale " + scale + ", dx " + dx
+ ", max " + maxDx1);
// applyScaleAndTranslation();
child2().setScaleX(scale);
child2().setScaleY(scale);
}
if(mode == Mode.DRAG ){
getParent().requestDisallowInterceptTouchEvent(true);
float maxDx = (child().getWidth() - (child().getWidth() / scale)) / 2 * scale;
float maxDy = (child().getHeight() - (child().getHeight() / scale)) / 2 * scale;
dx = Math.min(Math.max(dx, -maxDx), maxDx);
dy = Math.min(Math.max(dy, -maxDy), maxDy);
Log.i(TAG, "Width: " + child().getWidth() + ", scale " + scale + ", dx " + dx
+ ", max " + maxDx);
child().setTranslationX(dx);
child().setTranslationY(dy);
getParent().requestDisallowInterceptTouchEvent(true);
float maxDx1 = (child2().getWidth() - (child2().getWidth() / scale)) / 2 * scale;
float maxDy1 = (child2().getHeight() - (child2().getHeight() / scale)) / 2 * scale;
dx = Math.min(Math.max(dx, -maxDx1), maxDx1);
dy = Math.min(Math.max(dy, -maxDy1), maxDy1);
Log.i(TAG, "Width: " + child2().getWidth() + ", scale " + scale + ", dx " + dx
+ ", max " + maxDx);
child2().setTranslationX(dx);
child2().setTranslationY(dy);
}
return true;
}
});
}
public int getHitboxColour(int x, int y,ImageView iv) {
// ImageView iv = (ImageView) findViewById(R.id.img_hitbox);
Bitmap bmpHotspots;
int pixel;
// Fix any offsets by the positioning of screen elements such as Activity titlebar.
// This part was causing me issues when I was testing out Bill Lahti's code.
int[] location = new int[2];
iv.getLocationOnScreen(location);
x -= location[0];
y -= location[1];
// Prevent crashes, return background noise
if ((x < 0) || (y < 0)) {
return Color.WHITE;
}
// Draw the scaled bitmap into memory
iv.setDrawingCacheEnabled(true);
bmpHotspots = Bitmap.createBitmap(iv.getDrawingCache());
iv.setDrawingCacheEnabled(false);
pixel = bmpHotspots.getPixel(x, y);
bmpHotspots.recycle();
return pixel;
}
// ScaleGestureDetector
@Override
public boolean onScaleBegin(ScaleGestureDetector scaleDetector) {
Log.i(TAG, "onScaleBegin");
return true;
}
@Override
public boolean onScale(ScaleGestureDetector scaleDetector) {
float scaleFactor = scaleDetector.getScaleFactor();
Log.i(TAG, "onScale" + scaleFactor);
if (lastScaleFactor == 0 || (Math.signum(scaleFactor) == Math.signum(lastScaleFactor))) {
scale *= scaleFactor;
scale = Math.max(MIN_ZOOM, Math.min(scale, MAX_ZOOM));
lastScaleFactor = scaleFactor;
} else {
lastScaleFactor = 0;
}
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector scaleDetector) {
Log.i(TAG, "onScaleEnd");
}
private void applyScaleAndTranslation() {
child().setScaleX(scale);
child().setScaleY(scale);
child().setTranslationX(dx);
child().setTranslationY(dy);
}
private View child() {
return getChildAt(0);
}
private View child2() {
return getChildAt(1);
}
}
XML文件
<com.diu.utils.ZoomLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rel_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/img"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/maplocation" />
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@mipmap/maplocation"
android:visibility="invisible" />
</com.diu.utils.ZoomLayout>
0 个答案:
没有答案
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