求一个角度的sin,cos值的demo

package iodemo;

//求一个角度的sin cos值

public class AngleDemo {

static int averageAngle = 3;

static double[] sin;

static double[] cos;

static {

sin = new double[180 / averageAngle + 1];

cos = new double[180 / averageAngle + 1];

sin[0] = 0.0;

sin[1] = 0.05233595624294383;

sin[2] = 0.10452846326765346;

sin[3] = 0.15643446504023087;

sin[4] = 0.20791169081775931;

sin[5] = 0.25881904510252074;

sin[6] = 0.3090169943749474;

sin[7] = 0.35836794954530027;

sin[8] = 0.40673664307580015;

sin[9] = 0.45399049973954675;

sin[10] = 0.49999999999999994;

sin[11] = 0.544639035015027;

sin[12] = 0.5877852522924731;

sin[13] = 0.6293203910498375;

sin[14] = 0.6691306063588582;

sin[15] = 0.7071067811865475;

sin[16] = 0.7431448254773942;

sin[17] = 0.7771459614569708;

sin[18] = 0.8090169943749475;

sin[19] = 0.8386705679454239;

sin[20] = 0.8660254037844386;

sin[21] = 0.8910065241883678;

sin[22] = 0.9135454576426009;

sin[23] = 0.9335804264972017;

sin[24] = 0.9510565162951535;

sin[25] = 0.9659258262890683;

sin[26] = 0.9781476007338057;

sin[27] = 0.9876883405951378;

sin[28] = 0.9945218953682733;

sin[29] = 0.9986295347545738;

sin[30] = 1.0;

sin[31] = 0.9986295347545738;

sin[32] = 0.9945218953682734;

sin[33] = 0.9876883405951377;

sin[34] = 0.9781476007338057;

sin[35] = 0.9659258262890683;

sin[36] = 0.9510565162951536;

sin[37] = 0.9335804264972017;

sin[38] = 0.913545457642601;

sin[39] = 0.8910065241883679;

sin[40] = 0.8660254037844387;

sin[41] = 0.838670567945424;

sin[42] = 0.8090169943749475;

sin[43] = 0.777145961456971;

sin[44] = 0.7431448254773945;

sin[45] = 0.7071067811865476;

sin[46] = 0.669130606358858;

sin[47] = 0.6293203910498374;

sin[48] = 0.5877852522924732;

sin[49] = 0.5446390350150273;

sin[50] = 0.49999999999999994;

sin[51] = 0.45399049973954686;

sin[52] = 0.40673664307580004;

sin[53] = 0.35836794954530066;

sin[54] = 0.3090169943749475;

sin[55] = 0.258819045102521;

sin[56] = 0.20791169081775931;

sin[57] = 0.15643446504023098;

sin[58] = 0.10452846326765373;

sin[59] = 0.05233595624294425;

sin[60] = 0;

cos[0] = 1.0;

cos[1] = 0.9986295347545738;

cos[2] = 0.9945218953682733;

cos[3] = 0.9876883405951378;

cos[4] = 0.9781476007338057;

cos[5] = 0.9659258262890683;

cos[6] = 0.9510565162951535;

cos[7] = 0.9335804264972017;

cos[8] = 0.9135454576426009;

cos[9] = 0.8910065241883679;

cos[10] = 0.8660254037844387;

cos[11] = 0.838670567945424;

cos[12] = 0.8090169943749475;

cos[13] = 0.7771459614569709;

cos[14] = 0.7431448254773942;

cos[15] = 0.7071067811865476;

cos[16] = 0.6691306063588582;

cos[17] = 0.6293203910498375;

cos[18] = 0.5877852522924731;

cos[19] = 0.5446390350150272;

cos[20] = 0.5000000000000001;

cos[21] = 0.45399049973954686;

cos[22] = 0.4067366430758004;

cos[23] = 0.35836794954530016;

cos[24] = 0.30901699437494745;

cos[25] = 0.25881904510252074;

cos[26] = 0.20791169081775923;

cos[27] = 0.15643446504023092;

cos[28] = 0.10452846326765346;

cos[29] = 0.052335956242943966;

cos[30] = 0;

cos[31] = -0.05233595624294384;

cos[32] = -0.10452846326765333;

cos[33] = -0.15643446504023104;

cos[34] = -0.20791169081775912;

cos[35] = -0.25881904510252085;

cos[36] = -0.30901699437494734;

cos[37] = -0.35836794954530027;

cos[38] = -0.4067366430758001;

cos[39] = -0.45399049973954675;

cos[40] = -0.4999999999999998;

cos[41] = -0.5446390350150271;

cos[42] = -0.587785252292473;

cos[43] = -0.6293203910498373;

cos[44] = -0.6691306063588579;

cos[45] = -0.7071067811865475;

cos[46] = -0.7431448254773944;

cos[47] = -0.7771459614569709;

cos[48] = -0.8090169943749473;

cos[49] = -0.8386705679454239;

cos[50] = -0.8660254037844387;

cos[51] = -0.8910065241883678;

cos[52] = -0.913545457642601;

cos[53] = -0.9335804264972016;

cos[54] = -0.9510565162951535;

cos[55] = -0.9659258262890682;

cos[56] = -0.9781476007338057;

cos[57] = -0.9876883405951377;

cos[58] = -0.9945218953682733;

cos[59] = -0.9986295347545738;

cos[60] = -1.0;

for(int i = 0; i < sin.length; i++) {

System.out.println(" sin["+i+"] = " + Math.sin(i * averageAngle / 180.0 * Math.PI)+";");

}

for(int i = 0; i < cos.length; i++) {

System.out.println(" cos["+i+"] = " + Math.cos(i * averageAngle / 180.0 * Math.PI)+";");

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

}

}