java 反射 画Sin、Cos函数曲线

package test;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class Test3 {String str1 = "111";String str2 = "222";String str3 = "333";char[] c = {'a','b','c','d'};public Test3(String str){this.str3 = str;}    public static void main(String[] args) {    Test3 t = new Test3("333");    Class c = t.getClass();    Method[] m = c.getDeclaredMethods();    Field[] f = c.getDeclaredFields();    for(int i=0;i<f.length;i++){    if(f[i].getType()==char[].class) continue;try {//打印所有属性值  如果是静态属性，可以直接用Test3.class代替System.out.println(f[i].getName() + "  " + f[i].get(t).toString());} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();}    }    for(int i=0;i<m.length;i++){    if(m[i].getReturnType()==String.class){    try {    //打印所有为String的方法返回值System.out.println(m[i].getName() + "  " +m[i].invoke(t));} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}    }    }        TriFunc tri = new TriFunc();        // 生成一块25×100的画布         Canvas canvas = new Canvas(30, 100);        // 画sin曲线，周期为2        tri.drawSin(canvas, 2);        canvas.printCanvas();          System.out.println();        canvas.reset();        // 画cos曲线，周期为2        tri.drawCos(canvas, 2);        canvas.printCanvas();    }public String getStr1() {return str1;}public String getStr2() {return str2;}public String getStr3() {return str3;}@Overridepublic int hashCode() {final int PRIME = 31;int result = super.hashCode();result = PRIME * result + ((str1 == null) ? 0 : str1.hashCode());result = PRIME * result + ((str2 == null) ? 0 : str2.hashCode());result = PRIME * result + ((str3 == null) ? 0 : str3.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (!super.equals(obj))return false;if (getClass() != obj.getClass())return false;final Test3 other = (Test3) obj;if (str1 == null) {if (other.str1 != null)return false;} else if (!str1.equals(other.str1))return false;if (str2 == null) {if (other.str2 != null)return false;} else if (!str2.equals(other.str2))return false;if (str3 == null) {if (other.str3 != null)return false;} else if (!str3.equals(other.str3))return false;return true;}}class TriFunc {    /**     * 画sin曲线      * @param canvas 画布      * @param period 曲线周期      */    public void drawSin(Canvas canvas, double period) {                char[][] chars = canvas.getCanvas();        // x 轴的比率         double xRatio = (2 * period * Math.PI) / (canvas.getWidth() - 1);        // y 轴的放大倍率         int yMulti = (canvas.getHeight() - 1) / 2;        for(int i = 0; i < canvas.getWidth(); i++) {            // 将数组索引映射为横坐标值              double k = (i - canvas.getWidth() / 2) * xRatio;            // 将sin值映射为数组索引              int h = yMulti - (int)Math.round(Math.sin(k) * yMulti);            chars[h][i] = Canvas.FILL_CHAR;        }    }        /**     * 画cos曲线      * @param canvas 画布      * @param period 曲线周期      */    public void drawCos(Canvas canvas, double period) {        char[][] chars = canvas.getCanvas();        double xRatio = (2 * period * Math.PI) / (canvas.getWidth() - 1);        int yMulti = (canvas.getHeight() - 1) / 2;        for(int i = 0; i < canvas.getWidth(); i++) {            double k = (i - canvas.getWidth() / 2) * xRatio;            int h = yMulti - (int)Math.round(Math.cos(k) * yMulti);            chars[h][i] = Canvas.FILL_CHAR;        }    }}class Canvas {        private int height;    private int width;    private char[][] canvas;           // 填充字符     public static char FILL_CHAR = '#';    // 空白字符     public static char BLANK_CHAR = ' ';        /**     * 构建一块画布      * @param height     * @param width     */    public Canvas(int height, int width) {        // 由于需要画坐标轴，所以得采用奇数         this.height = height % 2 == 0 ? height + 1 : height;        this.width = width % 2 == 0 ? width + 1 : width;                       init();    }        /**     * 初始化画布      */    private void init() {        this.canvas = new char[height][width];        for(int i = 0; i < height; i++) {            for(int j = 0; j < width; j++) {                canvas[i][j] = BLANK_CHAR;            }        }        addAxis();    }        /**     * 添加坐标轴      */    private void addAxis() {        // 添加横坐标         int y = height / 2;        for(int x = 0; x < width; x++) {            canvas[y][x] = '-';        }        // 添加纵坐标         int xx = width / 2;        for(int yy = 0; yy < height; yy++) {            canvas[yy][xx] = '|';        }        // 添加原点         canvas[y][xx] = '+';    }        /**     * 输出画布      */    public void printCanvas() {        for(int i = 0; i < height; i++) {            for(int j = 0; j < width; j++) {                System.out.print(canvas[i][j]);            }            System.out.println();        }    }        /**     * 清空画布      */    public void reset() {        init();    }        public int getHeight() {        return height;    }    public int getWidth() {        return width;    }    public char[][] getCanvas() {        return canvas;    }    }