java 画sin曲线 java 画函数曲线

import java.applet.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.Timer;
/** java 画sin曲线*/
public class charts extends Applet {static int LEN;static int Xo, Yo; //坐标原点(Xo,Yo)static int X2, Y2; //X轴顶点坐标(Xo,Yo)static final int X1 = 50, Y1 = 30; //Y轴顶点坐标(Xo,Yo)static int Yunit, Xunit;static float Unit;static String Xstr, Ystr;  static int[] Xval;static int[] Yval;static float[] Y = new float[5];static int Xmax, Xmin;static float Ymax, Ymin;static int[] Yvalue;static int[] Xvalue;static float tempy;static int here = 0;;ActionListener timerActionListener = new ActionListener() {public void actionPerformed(ActionEvent evect) {Ystr = "";here++;for (int i = 0 + here; i < 100 + here; i++) {Ystr += (int) (Math.sin(Math.PI * i / 25) * 100 + 100) + ",";}Yvalue = getY(Yunit, tempy, Ymin, Substr(Ystr));re();}};public void re() {this.repaint();}public void init() {Timer miaobiaoTimer = new Timer(100, timerActionListener);miaobiaoTimer.start();//setBackground(Color.gray); int width = this.getBounds().width;int height = this.getBounds().height;setSize(width, height);//Xstr = getParameter("xValue");Ystr = "100,112,124,136,148,158,168,177,184,190,195,198,199,199,198,195,190,184,177,168,158,148,136,124,112,100,87,75,63,51,41,31,22,15,9,4,1,0,0,1,4,9,15,22,31,41,51,63,75,87,100,112,124,136,148,158,168,177,184,190,195,198,199,199,198,195,190,184,177,168,158,148,136,124,112,100,87,75,63,51,41,31,22,15,9,4,1,0,0,1,4,9,15,22,31,41,51,63,75,87,";//Ystr = getParameter("yValue");Xstr = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50";Xval = Substr(Xstr);Yval = Substr(Ystr);LEN = Xval.length;Yvalue = new int[LEN];Xvalue = new int[LEN];Xo = 50;Yo = height - 30;X2 = width - 30;Y2 = Yo;Yunit = (height - 100) / 4;Xunit = (width - 100) / LEN;Ymax = getMaxVal(Yval);Ymin = getMinVal(Yval);tempy = ((float) Ymax - (float) Ymin) / 4;Y[0] = Ymin; //Y轴坐标刻度Y[1] = Ymin + tempy;Y[2] = Ymin + tempy * 2;Y[3] = Ymin + tempy * 3;Y[4] = Ymax;Unit = (float) (Yunit * 4) / ((float) Ymax - (float) Ymin);Yvalue = getY(Yunit, tempy, Ymin, Yval);}public static int[] getY(int unit, float diff, float ymin, int[] value) {int I = 0; //unit=Yunit; diff=temp; ymin=Yminint[] result = new int[LEN];for (I = 0; I < LEN; I++) {result[I] = (int) (Yo - ((4 * unit) / (diff * 4)) * (value[I] - ymin));}return result;}public void paint(Graphics g) {g.setColor(Color.red);//坐标原点(30,290)g.drawLine(Xo, Yo, X1, Y1); //Y轴int I;for (I = 0; I < 5; I++) {g.drawLine(Xo, Yo - Yunit * I, Xo - 5, Yo - Yunit * I); //Yg.drawString(Float.toString(Y[I]), Xo - 38, Yo - Yunit * I);}g.drawLine(X1, Y1, X1 - 5, Y1 + 5); //Y轴左箭头g.drawLine(X1, Y1, X1 + 5, Y1 + 5); //Y轴右箭头g.drawLine(Xo, Yo, X2, Y2); //X轴//System.out.PRintln("");for (I = 0; I < LEN; I++) {g.drawLine(Xo + Xunit * I, Yo, Xo + Xunit * I, Yo + 5); //X//System.out.print((Xo+Xunit*I)+" ");g.drawString(Integer.toString(Xval[I]), Xo + Xunit * I - 6, Yo + 20);}g.drawLine(X2, Y2, X2 - 5, Y2 - 5); //X轴左箭头g.drawLine(X2, Y2, X2 - 5, Y2 + 5); //X轴右箭头g.setColor(Color.black);g.drawString("Y", X1 - 20, Y1);g.drawString("X", X2, Y2 + 20);for (I = 0; I < LEN - 1; I++) {g.drawLine(Xo + Xunit * I, Yvalue[I], Xo + Xunit * (I + 1), Yvalue[I + 1]);}}public static int[] Substr(String str) {int I = 0;StringTokenizer st = new StringTokenizer(str, ",");int len = st.countTokens();int[] val = new int[len];while (st.hasMoreTokens()) {val[I] = Integer.parseInt(st.nextToken());I++;}return val;}public static int getMaxVal(int[] Maxval) {int I, result;result = Maxval[0];for (I = 0; I < Maxval.length; I++) {if (result < Maxval[I]) {result = Maxval[I];}}return result;}public static int getMinVal(int[] Minval) {int I, result;result = Minval[0];for (I = 0; I < Minval.length; I++) {if (result > Minval[I]) {result = Minval[I];}}return result;}
}

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