com.yalantis.ucrop.util.RectUtils Maven / Gradle / Ivy
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package com.yalantis.ucrop.util;
import android.graphics.RectF;
public class RectUtils {
/**
* Gets a float array of the 2D coordinates representing a rectangles
* corners.
* The order of the corners in the float array is:
* 0------->1
* ^ |
* | |
* | v
* 3<-------2
*
* @param r the rectangle to get the corners of
* @return the float array of corners (8 floats)
*/
public static float[] getCornersFromRect(RectF r) {
return new float[]{
r.left, r.top,
r.right, r.top,
r.right, r.bottom,
r.left, r.bottom
};
}
/**
* Gets a float array of two lengths representing a rectangles width and height
* The order of the corners in the input float array is:
* 0------->1
* ^ |
* | |
* | v
* 3<-------2
*
* @param corners the float array of corners (8 floats)
* @return the float array of width and height (2 floats)
*/
public static float[] getRectSidesFromCorners(float[] corners) {
return new float[]{(float) Math.sqrt(Math.pow(corners[0] - corners[2], 2) + Math.pow(corners[1] - corners[3], 2)),
(float) Math.sqrt(Math.pow(corners[2] - corners[4], 2) + Math.pow(corners[3] - corners[5], 2))};
}
public static float[] getCenterFromRect(RectF r) {
return new float[]{r.centerX(), r.centerY()};
}
/**
* Takes an array of 2D coordinates representing corners and returns the
* smallest rectangle containing those coordinates.
*
* @param array array of 2D coordinates
* @return smallest rectangle containing coordinates
*/
public static RectF trapToRect(float[] array) {
RectF r = new RectF(Float.POSITIVE_INFINITY, Float.POSITIVE_INFINITY,
Float.NEGATIVE_INFINITY, Float.NEGATIVE_INFINITY);
for (int i = 1; i < array.length; i += 2) {
float x = Math.round(array[i - 1] * 10) / 10.f;
float y = Math.round(array[i] * 10) / 10.f;
r.left = (x < r.left) ? x : r.left;
r.top = (y < r.top) ? y : r.top;
r.right = (x > r.right) ? x : r.right;
r.bottom = (y > r.bottom) ? y : r.bottom;
}
r.sort();
return r;
}
}