這段代碼你參考一下??梢赃\(yùn)行的package common;public class test {
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public static void main(String[] args){
Pentagram pen = new Pentagram(10,0,' ','★');
Draw.printCanvas(pen.getPentagram());
}
}// Pentagram.java 五角星類
class Pentagram {
private final char FILL_CHAR; // 填充字符
private final char SPACE_CHAR; // 空檔字符
private final int R; // 五角星的外接圓半徑
private final float ROTATION; // 五角星逆時針旋轉(zhuǎn)角度
private final int X; // 用于生成畫圖數(shù)組
private final int Y; // 用于生成畫圖數(shù)組 /**
* 構(gòu)造一個Pentagram對象
*
* @param radius
* 五角星的半徑
* @param rotation
* 五角星的逆時針旋轉(zhuǎn)度數(shù)
* @param spaceChar
* 畫布上空白處填充字符
* @param fillChar
* 畫布上線條部分填充字符
*/
public Pentagram(int radius, float rotation, char spaceChar, char fillChar) {
this.R = radius;
this.ROTATION = rotation;
this.FILL_CHAR = fillChar;
this.SPACE_CHAR = spaceChar;
this.X = 2 * R + 1;
this.Y = 2 * R + 1;
} public char[][] getPentagram() {
char[][] canvas = initCanvas();
Draw draw = new Draw(FILL_CHAR);
// 設(shè)五角星的最右邊的一個點(diǎn)為 A,逆時針選取點(diǎn) B~E
// 通過圓的極坐標(biāo)公式可以得出:
// 得出以下各點(diǎn)的坐標(biāo)
// A 點(diǎn)坐標(biāo)(0.951R, 0.309R)
// B 點(diǎn)坐標(biāo)(0, R)
// C 點(diǎn)坐標(biāo)(-0.951R, 0.309R)
// D 點(diǎn)坐標(biāo)(-0.588R, -0.809R)
// E 點(diǎn)坐標(biāo)(0.588R, -0.809R)
// 畫線段CA
draw.drawLine(mcos(162) * R, msin(162) * R, mcos(18) * R, msin(18) * R,
canvas);
// 畫線段DA
draw.drawLine(mcos(234) * R, msin(234) * R, mcos(18) * R, msin(18) * R,
canvas);
// 畫線段CE
draw.drawLine(mcos(162) * R, msin(162) * R, mcos(306) * R, msin(306)
* R, canvas);
// 畫線段DB
draw.drawLine(mcos(234) * R, msin(234) * R, mcos(90) * R, msin(90) * R,
canvas);
// 畫線段BE
draw.drawLine(mcos(90) * R, msin(90) * R, mcos(306) * R, msin(306) * R,
canvas);
return canvas;
} // 在方形的字符數(shù)組中指定兩點(diǎn)畫線條
// 對圖形數(shù)組進(jìn)行初始化,填充空格
private char[][] initCanvas() {
char[][] canvas = new char[Y][X];
for (int i = 0; i Y; i++) {
for (int j = 0; j X; j++) {
canvas[i][j] = SPACE_CHAR;
}
}
return canvas;
} // 根據(jù)角度求正弦值,保留兩位小數(shù)
private double msin(float a) {
return ((int) (Math.sin(Math.toRadians(a + ROTATION)) * 100)) / 100.0;
} // 根據(jù)角度求余弦值,保留兩位小數(shù)
private double mcos(float a) {
return ((int) (Math.cos(Math.toRadians(a + ROTATION)) * 100)) / 100.0;
}
}// Draw.java 畫圖工具類
class Draw {
private char fillChar; public Draw(char fillChar) {
this.fillChar = fillChar;
} /**
* 根據(jù)兩個點(diǎn)畫線在二維字符數(shù)組上畫線
*
* @param x1
* @param y1
* @param x2
* @param y2
* @param canvas
*/
public void drawLine(double x1, double y1, double x2, double y2,
char[][] canvas) {
int radius = (canvas.length - 1) / 2;
// 從 x 方向進(jìn)行填充
if (x1 x2) {
double t = x1;
x1 = x2;
x2 = t;
t = y1;
y1 = y2;
y2 = t;
}
// 獲得直線方程的兩個系數(shù)
double a = (y1 - y2) / (x1 - x2);
double b = y1 - a * x1;
// 根據(jù) x 方向的值求出 y 值,并填充圖形
for (int i = (int) Math.round(x1); i = (int) Math.round(x2); i++) {
// 根據(jù)直線方程 y = ax + b,求 y
int y = (int) Math.round(a * i + b);
// 因?yàn)?y 和 i 算出來的結(jié)果有可能是負(fù)數(shù),
// 為了采用數(shù)組來表示坐標(biāo),做了以下變換
// c[R][R] 即為坐標(biāo)原點(diǎn)
// c[R][0..R] 為 x 方向的負(fù)半軸
// c[R][R+1..2*R] 為 x 方向的正半軸
// c[0..R][R] 為 y 方向的正半軸
// c[R+1..2*R][R] 為 y 方向的負(fù)半軸
int yy = radius - y;
int xx = radius + i;
yy = yy 0 ? 0 : yy;
yy = yy 2 * radius ? 2 * radius : yy;
xx = xx 0 ? 0 : xx;
xx = xx 2 * radius ? 2 * radius : xx;
canvas[yy][xx] = fillChar;
}
// 從 y 方向進(jìn)行填充,便于減少間距問題產(chǎn)生的字符空檔
if (y1 y2) {
double t = x1;
x1 = x2;
x2 = t;
t = y1;
y1 = y2;
y2 = t;
}
// 根據(jù) y 方向的值求出 x 值,并填充圖形
for (int i = (int) Math.round(y1); i = (int) Math.round(y2); i++) {
// 根據(jù) x = (y - b) / a,求 x
int y = (int) Math.round((i - b) / a);
int yy = radius - i;
int xx = radius + y;
yy = yy 0 ? 0 : yy;
yy = yy 2 * radius ? 2 * radius : yy;
xx = xx 0 ? 0 : xx;
xx = xx 2 * radius ? 2 * radius : xx;
canvas[yy][xx] = fillChar;
}
} /**
* 將畫完圖之后的畫布輸出到控制臺上
*
* @param canvas
*/
public static void printCanvas(char[][] canvas){
for (int i = 0; i canvas.length; i++) {
for (int j = 0; j canvas[i].length; j++) {
System.out.print(canvas[i][j]);
}
System.out.println();
}
}
}
public class TestStar {
public static void main(String[] args) {
String star = "*";
for (int i = 0; i 5; i++) {
if (i == 0) {
System.out.print(" " + star);
System.out.println();
}
if (i == 1) {
for (int z = 0; z 4; z++) {
System.out.print(" " + star);
}
System.out.println();
}
if (i == 2) {
System.out.print(" ");
for (int x = 0; x 3; x++) {
System.out.print(" " + star);
}
System.out.println();
}
if (i == 3) {
for (int y = 0; y 2; y++) {
System.out.print(" " + star + " ");
}
}
}
}
}
是好使的 但是我沒找到畫五角星有什么規(guī)律(五角星好象不是正規(guī)圖形吧?)如果還有什么要求的話 補(bǔ)充問題(如果是用*填充所有的東西 不包括 “ ”的話 我可以重新再給你寫一個)
運(yùn)行圖如上。
代碼如下:
public?static?void?main(String[]?args)?{
new?StarDemo().printStar(5);
}
public?void?printStar(int?num){
if(num0){
for?(int?i?=?0;?i??num;?i++)?{
System.out.print("★");
}
System.out.print("??");
num--;
printStar(num);
}
}
=========以下代碼抄的
import java.awt.*;
import javax.swing.*;
public class WuJiaoXing extends JPanel {
private static final long serialVersionUID = 1L;
private JFrame frame = null;
private int r = 150; // 外頂點(diǎn)外接圓半徑
private int[] x = new int[5]; // 5個X外頂點(diǎn)坐標(biāo)
private int[] y = new int[5]; // 5個Y外頂點(diǎn)坐標(biāo)
private int[] x_ = new int[5]; // 5個X內(nèi)頂點(diǎn)坐標(biāo)
private int[] y_ = new int[5]; // 5個Y內(nèi)頂點(diǎn)坐標(biāo)
public WuJiaoXing() {
this.math();
frame = new JFrame("五角星");
frame.getContentPane().add(this);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500,500);
frame.setLocation(200, 200);
frame.setVisible(true);
}
private void math() {
int c = 360 / 5; // 角度
for (int i = 0; i 5; i++) {
x[i] = (int) (Math.cos(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
y[i] = (int) (Math.sin(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
}
int r_ = (int) (r * Math.sin(18 * Math.PI / 180) / Math
.sin(126 * Math.PI / 180)); // 內(nèi)頂點(diǎn)外接圓半徑
for (int i = 0; i 5; i++) {
x_[i] = (int) (Math.cos((i * c + 18) * Math.PI / 30 - Math.PI / 2)
* (r_) + r);
y_[i] = (int) (Math.sin((i * c + 18) * Math.PI / 30 - Math.PI / 2)
* (r_) + r);
}
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.YELLOW);
// g.setBackground(Color.RED);
// 填充
int[] x1 = { x[0], x[2], x_[2] };
int[] y1 = { y[0], y[2], y_[2] };
int[] x2 = { x[1], x[3], x_[3] };
int[] y2 = { y[1], y[3], y_[3] };
int[] x3 = { x[2], x[4], x_[4] };
int[] y3 = { y[2], y[4], y_[4] };
g.fillPolygon(x1, y1, 3);
g.fillPolygon(x2, y2, 3);
g.fillPolygon(x3, y3, 3);
// 描邊
// g.setColor(Color.BLACK);
// g.drawLine(x[0], y[0], x[2], y[2]);
// g.drawLine(x[0], y[0], x[3], y[3]);
// g.drawLine(x[1], y[1], x[3], y[3]);
// g.drawLine(x[1], y[1], x[4], y[4]);
// g.drawLine(x[2], y[2], x[4], y[4]);
// g.drawLine(x[2], y[2], x[0], y[0]);
}
public static void main(String[] args) {
new WuJiaoXing();
}
}
第二種,用控制臺
class Pentagram {
private final char FILL_CHAR; // 填充字符
private final char SPACE_CHAR; // 空檔字符
private final int R; // 五角星的外接圓半徑
private final float ROTATION; // 五角星逆時針旋轉(zhuǎn)角度
private final int X; // 用于生成畫圖數(shù)組
private final int Y; // 用于生成畫圖數(shù)組
/**
* 構(gòu)造一個Pentagram對象
*
* @param radius
* 五角星的半徑
* @param rotation
* 五角星的逆時針旋轉(zhuǎn)度數(shù)
* @param spaceChar
* 畫布上空白處填充字符
* @param fillChar
* 畫布上線條部分填充字符
*/
public Pentagram(int radius, float rotation, char spaceChar, char fillChar) {
this.R = radius;
this.ROTATION = rotation;
this.FILL_CHAR = fillChar;
this.SPACE_CHAR = spaceChar;
this.X = 2 * R + 1;
this.Y = 2 * R + 1;
}
public char[][] getPentagram() {
char[][] canvas = initCanvas();
Draw draw = new Draw(FILL_CHAR);
// 設(shè)五角星的最右邊的一個點(diǎn)為 A,逆時針選取點(diǎn) B~E
// 通過圓的極坐標(biāo)公式可以得出:
// 得出以下各點(diǎn)的坐標(biāo)
// A 點(diǎn)坐標(biāo)(0.951R, 0.309R)
// B 點(diǎn)坐標(biāo)(0, R)
// C 點(diǎn)坐標(biāo)(-0.951R, 0.309R)
// D 點(diǎn)坐標(biāo)(-0.588R, -0.809R)
// E 點(diǎn)坐標(biāo)(0.588R, -0.809R)
// 畫線段CA
draw.drawLine(mcos(162) * R, msin(162) * R, mcos(18) * R, msin(18) * R, canvas);
// 畫線段DA
draw.drawLine(mcos(234) * R, msin(234) * R, mcos(18) * R, msin(18) * R, canvas);
// 畫線段CE
draw.drawLine(mcos(162) * R, msin(162) * R, mcos(306) * R, msin(306) * R, canvas);
// 畫線段DB
draw.drawLine(mcos(234) * R, msin(234) * R, mcos(90) * R, msin(90) * R, canvas);
// 畫線段BE
draw.drawLine(mcos(90) * R, msin(90) * R, mcos(306) * R, msin(306) * R, canvas);
return canvas;
}
// 在方形的字符數(shù)組中指定兩點(diǎn)畫線條
// 對圖形數(shù)組進(jìn)行初始化,填充空格
private char[][] initCanvas() {
char[][] canvas = new char[Y][X];
for (int i = 0; i Y; i++) {
for (int j = 0; j X; j++) {
canvas[i][j] = SPACE_CHAR;
}
}
return canvas;
}
// 根據(jù)角度求正弦值,保留兩位小數(shù)
private double msin(float a) {
return ((int) (Math.sin(Math.toRadians(a + ROTATION)) * 100)) / 100.0;
}
// 根據(jù)角度求余弦值,保留兩位小數(shù)
private double mcos(float a) {
return ((int) (Math.cos(Math.toRadians(a + ROTATION)) * 100)) / 100.0;
}
}
class Draw {
private char fillChar;
public Draw(char fillChar) {
this.fillChar = fillChar;
}
/**
* 根據(jù)兩個點(diǎn)畫線在二維字符數(shù)組上畫線
*
* @param x1
* @param y1
* @param x2
* @param y2
* @param canvas
*/
public void drawLine(double x1, double y1, double x2, double y2, char[][] canvas) {
int radius = (canvas.length - 1) / 2;
// 從 x 方向進(jìn)行填充
if (x1 x2) {
double t = x1;
x1 = x2;
x2 = t;
t = y1;
y1 = y2;
y2 = t;
}
// 獲得直線方程的兩個系數(shù)
double a = (y1 - y2) / (x1 - x2);
double b = y1 - a * x1;
// 根據(jù) x 方向的值求出 y 值,并填充圖形
for (int i = (int) Math.round(x1); i = (int) Math.round(x2); i++) {
// 根據(jù)直線方程 y = ax + b,求 y
int y = (int) Math.round(a * i + b);
// 因?yàn)?y 和 i 算出來的結(jié)果有可能是負(fù)數(shù),
// 為了采用數(shù)組來表示坐標(biāo),做了以下變換
// c[R][R] 即為坐標(biāo)原點(diǎn)
// c[R][0..R] 為 x 方向的負(fù)半軸
// c[R][R+1..2*R] 為 x 方向的正半軸
// c[0..R][R] 為 y 方向的正半軸
// c[R+1..2*R][R] 為 y 方向的負(fù)半軸
int yy = radius - y;
int xx = radius + i;
yy = yy 0 ? 0 : yy;
yy = yy 2 * radius ? 2 * radius : yy;
xx = xx 0 ? 0 : xx;
xx = xx 2 * radius ? 2 * radius : xx;
canvas[yy][xx] = fillChar;
}
// 從 y 方向進(jìn)行填充,便于減少間距問題產(chǎn)生的字符空檔
if (y1 y2) {
double t = x1;
x1 = x2;
x2 = t;
t = y1;
y1 = y2;
y2 = t;
}
// 根據(jù) y 方向的值求出 x 值,并填充圖形
for (int i = (int) Math.round(y1); i = (int) Math.round(y2); i++) {
// 根據(jù) x = (y - b) / a,求 x
int y = (int) Math.round((i - b) / a);
int yy = radius - i;
int xx = radius + y;
yy = yy 0 ? 0 : yy;
yy = yy 2 * radius ? 2 * radius : yy;
xx = xx 0 ? 0 : xx;
xx = xx 2 * radius ? 2 * radius : xx;
canvas[yy][xx] = fillChar;
}
}
/**
* 將畫完圖之后的畫布輸出到控制臺上
*
* @param canvas
*/
public static void printCanvas(char[][] canvas) {
for (int i = 0; i canvas.length; i++) {
for (int j = 0; j canvas[i].length; j++) {
System.out.print(canvas[i][j]);
}
System.out.println();
}
}
}
public class Test {
public static void main(String[] args) {
// 畫一個半徑為10,旋轉(zhuǎn)為0,空白為全身空格,填充為★的五角星
Pentagram pen = new Pentagram(10, 0, ' ', '★');
// 在控制臺上輸出這個五角星
Draw.printCanvas(pen.getPentagram());
}
}
注:其中Pentagram pen = new Pentagram(10, 0, ' ', '★');
10是半徑,0是旋轉(zhuǎn)度,' '是以空格表示空格,★是打印的字符??梢宰约焊?/p>
下面是用 Java 語言畫一個紅底五角星的代碼示例:
import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics;
import javax.swing.JFrame; import javax.swing.JPanel;
public class FivePointedStar {
public static void main(String[] args) {
JFrame frame = new JFrame("Five Pointed Star");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
FivePointedStarPanel panel = new FivePointedStarPanel();
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
class FivePointedStarPanel extends JPanel {
public FivePointedStarPanel() {
setPreferredSize(new Dimension(300, 300));
setBackground(Color.WHITE);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
int xPoints[] = {150, 200, 250, 225, 175, 125, 100, 125};
int yPoints[] = {100, 50, 100, 150, 150, 100, 50, 100};
int nPoints = 8; g.setColor(Color.RED);
g.fillPolygon(xPoints, yPoints, nPoints); }
}
這段代碼中,我們創(chuàng)建了一個 JFrame 窗口,并在窗口中添加了一個 JPanel 面板。在面板中,我們重寫了 paintComponent 方法,使用 Graphics 類的 fillPolygon 方法畫出了一個五角星。我們設(shè)置了五角星的顏色為紅色,并設(shè)置了面板的背景色為白色。
運(yùn)行這段代碼后,將會彈出一個窗口,顯示一個紅底五角星。
希望這個示例能幫助你畫出一個紅底五角星。
java五角星用代碼打印出來,主要是使用system.print函數(shù),代碼如下:
class kongzhitao{
public static void main(String[] args){
String[] wujiaoxing={" *"," * *","* * * *"," * *"," * *"," * * * *","* *"};
for(int i=0;i System.out.println(wujiaoxing[i]);
}
}
}