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