我试图从用户触摸图像的图像中获取颜色。我能够获得x,y坐标,并且可以使用Matrix计算它的像素,但是我的问题是它没有给我正确的颜色。
private void getColor(MotionEvent event, Button capture) {
float HeightRatio = (float) image.getHeight() / (float) imageView.getHeight();
float WidthRatio = (float) image.getWidth() / (float) imageView.getWidth();
Matrix inverse = new Matrix();
imageView.getImageMatrix().invert(inverse);
float[] touchPoint = new float[]{event.getX(), event.getY()};
i2.setX(event.getX());
i2.setY(event.getY());
inverse.mapPoints(touchPoint);
int x = Integer.valueOf((int) touchPoint[0]);
int y = Integer.valueOf((int) touchPoint[1]);
x = (int) (x * WidthRatio);
y = (int) (y * HeightRatio);
if (x < 0) {
x = 0;
} else if (x > image.getWidth() - 1) {
x = image.getWidth() - 1;
}
if (y < 0) {
y = 0;
} else if (y > image.getHeight() - 1) {
y = image.getHeight() - 1;
}
i2.setBackgroundColor(image.getPixel(x, y));
i2.setVisibility(View.VISIBLE);
capture.setBackgroundColor(image.getPixel(x, y));
}
这是我用来获取触摸坐标颜色的方法。
谢谢, VIPIN
答案 0 :(得分:0)
试试这个:
final Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
imageView.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event){
int x = (int)event.getX();
int y = (int)event.getY();
int pixel = bitmap.getPixel(x,y);
//then do what you want with the pixel data, e.g
int redValue = Color.red(pixel);
int blueValue = Color.blue(pixel);
int greenValue = Color.green(pixel);
return false;
}
});
答案 1 :(得分:0)
为什么这么复杂? https://stackoverflow.com/a/7807442/1979882
你试过这个吗?:
private void getColor(MotionEvent event, Button capture) {
float[] touchPoint = new float[]{event.getX(), event.getY()};
float x = touchPoint[0];
float y = touchPoint[1];
ImageView imageView = ((ImageView)v);
Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
int pixel = bitmap.getPixel(x,y);
capture.setBackgroundColor(image.getPixel(x, y));
}