61 lines
1.7 KiB
Java
61 lines
1.7 KiB
Java
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package org.warp.picalculator.gui;
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public class GraphicUtils {
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public static final float sin(float rad)
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{
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return sin[(int) (rad * radToIndex) & SIN_MASK];
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}
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public static final float cos(float rad)
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{
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return cos[(int) (rad * radToIndex) & SIN_MASK];
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}
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public static final float sinDeg(float deg)
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{
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return sin[(int) (deg * degToIndex) & SIN_MASK];
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}
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public static final float cosDeg(float deg)
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{
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return cos[(int) (deg * degToIndex) & SIN_MASK];
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}
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private static final float RAD,DEG;
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private static final int SIN_BITS,SIN_MASK,SIN_COUNT;
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private static final float radFull,radToIndex;
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private static final float degFull,degToIndex;
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private static final float[] sin, cos;
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static
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{
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RAD = (float) Math.PI / 180.0f;
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DEG = 180.0f / (float) Math.PI;
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SIN_BITS = 12;
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SIN_MASK = ~(-1 << SIN_BITS);
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SIN_COUNT = SIN_MASK + 1;
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radFull = (float) (Math.PI * 2.0);
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degFull = (float) (360.0);
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radToIndex = SIN_COUNT / radFull;
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degToIndex = SIN_COUNT / degFull;
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sin = new float[SIN_COUNT];
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cos = new float[SIN_COUNT];
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for (int i = 0; i < SIN_COUNT; i++)
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{
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sin[i] = (float) Math.sin((i + 0.5f) / SIN_COUNT * radFull);
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cos[i] = (float) Math.cos((i + 0.5f) / SIN_COUNT * radFull);
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}
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// Four cardinal directions (credits: Nate)
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for (int i = 0; i < 360; i += 90)
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{
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sin[(int)(i * degToIndex) & SIN_MASK] = (float)Math.sin(i * Math.PI / 180.0);
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cos[(int)(i * degToIndex) & SIN_MASK] = (float)Math.cos(i * Math.PI / 180.0);
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}
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}
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}
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