import java.applet.*; import java.awt.*; public class Wjx extends java.applet.Applet implements Runnable{ Thread PaintThread; public void init() { } public void start(){ PaintThread=new Thread(this); PaintThread.start(); } public void stop(){ PaintThread=null; } public void paint(Graphics g){ //變量定義及初始化 int x[], y[], ox, oy, i, j, R, r, w, h; double a, inca, cura; Color c; int cr, cg, cb; inca=2 * Math.PI / 5; x=new int[10]; y=new int[10]; w=getSize().width; h=getSize().height; //五角星 for (i=0; i50; i++){ //隨機(jī)五角星特征 ox=(int)(Math.random() * w); oy=(int)(Math.random() * w); R=(int)(Math.random() * 50); r=(int)(R / 2); a=(int)(Math.random() * 2 * Math.PI / 5); //計(jì)算頂點(diǎn)數(shù)據(jù) for(j=0; j10; j+=2){ cura=a + inca * (j / 2); x[j]=ox + (int)(R * Math.sin(cura)); y[j]=oy + (int)(R * Math.cos(cura)); cura=cura + inca / 2; x[j+1]=ox + (int)(r * Math.sin(cura)); y[j+1]=oy + (int)(r * Math.cos(cura)); } cr=(int)(Math.random() * 255); cg=(int)(Math.random() * 255); cb=(int)(Math.random() * 255); c=new Color(cr, cg, cb); //畫出五角星 g.setColor(c); g.fillPolygon(x, y, 10); } } public void run() { while(PaintThread!=null){ repaint(); try{ Thread.sleep(125); } catch(InterruptedException E){ } } } }
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=========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(gè)X外頂點(diǎn)坐標(biāo)
private int[] y = new int[5]; // 5個(gè)Y外頂點(diǎn)坐標(biāo)
private int[] x_ = new int[5]; // 5個(gè)X內(nèi)頂點(diǎn)坐標(biāo)
private int[] y_ = new int[5]; // 5個(gè)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(shí)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(gè)Pentagram對象
*
* @param radius
* 五角星的半徑
* @param rotation
* 五角星的逆時(shí)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(gè)點(diǎn)為 A，逆時(shí)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(gè)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(gè)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(gè)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(gè)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(gè)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(gè) JFrame 窗口，并在窗口中添加了一個(gè) 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(gè)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(gè)窗口，顯示一個(gè)紅底五角星。
希望這個(gè)示例能幫助你畫出一個(gè)紅底五角星。
import java.applet.*;
import java.awt.*;
public class Wjx extends java.applet.Applet implements Runnable{
Thread PaintThread;
public void init() {
}
public void start(){
PaintThread=new Thread(this);
PaintThread.start();
}
public void stop(){
PaintThread=null;
}
public void paint(Graphics g){
//變量定義及初始化
int x[], y[], ox, oy, i, j, R, r, w, h;
double a, inca, cura;
Color c;
int cr, cg, cb;
inca=2 * Math.PI / 5;
x=new int[10];
y=new int[10];
w=getSize().width;
h=getSize().height;
//五角星
for (i=0; i50; i++){
//隨機(jī)五角星特征
ox=(int)(Math.random() * w);
oy=(int)(Math.random() * w);
R=(int)(Math.random() * 50);
r=(int)(R / 2);
a=(int)(Math.random() * 2 * Math.PI / 5);
//計(jì)算頂點(diǎn)數(shù)據(jù)
for(j=0; j10; j+=2){
cura=a + inca * (j / 2);
x[j]=ox + (int)(R * Math.sin(cura));
y[j]=oy + (int)(R * Math.cos(cura));
cura=cura + inca / 2;
x[j+1]=ox + (int)(r * Math.sin(cura));
y[j+1]=oy + (int)(r * Math.cos(cura));
}
cr=(int)(Math.random() * 255);
cg=(int)(Math.random() * 255);
cb=(int)(Math.random() * 255);
c=new Color(cr, cg, cb);
//畫出五角星
g.setColor(c);
g.fillPolygon(x, y, 10);
}
}
public void run() {
while(PaintThread!=null){
repaint();
try{
Thread.sleep(125);
}
catch(InterruptedException E){ }
}
}
}
試試
char[][] wjx={
{' ',' ',' ',' ','*','\r'},
{' ',' ',' ','*',' ','*','\r'},
{'*',' ','*',' ',' ',' ','*',' ','*','\r'},
{' ','*',' ',' ',' ',' ',' ','*','\r'},
{' ',' ','*',' ',' ',' ','*','\r'},
{' ','*',' ','*',' ','*',' ','*','\r'},
{'*',' ',' ',' ',' ',' ',' ',' ','*','\r'}
};
for(int i=0;i7;i++){
for(int j=0;jwjx[i].length;j++){
System.out.print(wjx[i][j]);
}
}
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