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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.replica.replicaisland;
/** A collection of miscellaneous utility functions. */
public class Utils {
private static final float EPSILON = 0.0001f;
public final static boolean close(float a, float b) {
return close(a, b, EPSILON);
}
public final static boolean close(float a, float b, float epsilon) {
return Math.abs(a - b) < epsilon;
}
public final static int sign(float a) {
if (a >= 0.0f) {
return 1;
} else {
return -1;
}
}
public final static int clamp(int value, int min, int max) {
int result = value;
if (min == max) {
if (value != min) {
result = min;
}
} else if (min < max) {
if (value < min) {
result = min;
} else if (value > max) {
result = max;
}
} else {
result = clamp(value, max, min);
}
return result;
}
public final static int byteArrayToInt(byte[] b) {
if (b.length != 4) {
return 0;
}
// Same as DataInputStream's 'readInt' method
/*int i = (((b[0] & 0xff) << 24) | ((b[1] & 0xff) << 16) | ((b[2] & 0xff) << 8)
| (b[3] & 0xff));*/
// little endian
int i = (((b[3] & 0xff) << 24) | ((b[2] & 0xff) << 16) | ((b[1] & 0xff) << 8)
| (b[0] & 0xff));
return i;
}
public final static float byteArrayToFloat(byte[] b) {
// intBitsToFloat() converts bits as follows:
/*
int s = ((i >> 31) == 0) ? 1 : -1;
int e = ((i >> 23) & 0xff);
int m = (e == 0) ? (i & 0x7fffff) << 1 : (i & 0x7fffff) | 0x800000;
*/
return Float.intBitsToFloat(byteArrayToInt(b));
}
public final static float framesToTime(int framesPerSecond, int frameCount) {
return (1.0f / framesPerSecond) * frameCount;
}
}
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