75 lines
2.3 KiB
Java
75 lines
2.3 KiB
Java
package org.thoughtcrime.securesms.imageeditor;
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import android.graphics.Matrix;
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import android.graphics.RectF;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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/**
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* The local extent of a {@link org.thoughtcrime.securesms.imageeditor.model.EditorElement}.
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* i.e. all {@link org.thoughtcrime.securesms.imageeditor.model.EditorElement}s have a bounding rectangle from:
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* <p>
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* {@link #LEFT} to {@link #RIGHT} and from {@link #TOP} to {@link #BOTTOM}.
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*/
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public final class Bounds {
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public static final float LEFT = -1000f;
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public static final float RIGHT = 1000f;
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public static final float TOP = -1000f;
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public static final float BOTTOM = 1000f;
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public static final float CENTRE_X = (LEFT + RIGHT) / 2f;
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public static final float CENTRE_Y = (TOP + BOTTOM) / 2f;
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public static final float[] CENTRE = new float[]{ CENTRE_X, CENTRE_Y };
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private static final float[] POINTS = { Bounds.LEFT, Bounds.TOP,
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Bounds.RIGHT, Bounds.TOP,
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Bounds.RIGHT, Bounds.BOTTOM,
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Bounds.LEFT, Bounds.BOTTOM };
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static RectF newFullBounds() {
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return new RectF(LEFT, TOP, RIGHT, BOTTOM);
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}
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public static RectF FULL_BOUNDS = newFullBounds();
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public static boolean contains(float x, float y) {
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return x >= FULL_BOUNDS.left && x <= FULL_BOUNDS.right &&
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y >= FULL_BOUNDS.top && y <= FULL_BOUNDS.bottom;
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}
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/**
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* Maps all the points of bounds with the supplied matrix and determines whether they are still in bounds.
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*
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* @param matrix matrix to transform points by, null is treated as identity.
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* @return true iff all points remain in bounds after transformation.
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*/
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public static boolean boundsRemainInBounds(@Nullable Matrix matrix) {
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if (matrix == null) return true;
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float[] dst = new float[POINTS.length];
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matrix.mapPoints(dst, POINTS);
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return allWithinBounds(dst);
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}
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private static boolean allWithinBounds(@NonNull float[] points) {
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boolean allHit = true;
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for (int i = 0; i < points.length / 2; i++) {
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float x = points[2 * i];
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float y = points[2 * i + 1];
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if (!Bounds.contains(x, y)) {
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allHit = false;
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break;
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}
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}
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return allHit;
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}
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}
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