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public class Test {
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public static void main(String[] args) {
int height =8;
int[][] nums = new int[height][height*2];
for(int i=0;inums.length;i++) {
for(int j=0;jnums[i].length;j++) {
if(j=i||j=nums[i].length-i-1) {
nums[i][j]=1;
}
}
}
print(nums);
}
public static void print(int[][] n) {
for(int i=0;in.length;i++) {
for(int j=0;jn[i].length;j++) {
if(n[i][j]==1) {
System.out.print("*");
}else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
public enum ShapeTypes {
LINE, CIRCLE, RECTANGLE
}
public interface Shape {
void paint(Graphics g);
}
public class Rectangle implements Shape {
// 矩形左上角的坐标
private int x, y;
// 矩形的宽度和高度
private int width, height;
private Color rectangleColor;
public Rectangle() {
super();
}
public Rectangle(int x, int y, int width, int height, Color rectangleColor) {
super();
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.rectangleColor = rectangleColor;
}
@Override
public void paint(Graphics g) {
g.setColor(rectangleColor);
g.drawRect(x, y, width, height);
}
}
public class Line implements Shape {
// 直线的起始位置
private int x1, y1;
// 直线的终止位置
private int x2, y2;
private Color lineColor;
public Line(int x1, int y1, int x2, int y2, Color lineColor) {
super();
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.lineColor = lineColor;
}
public Line() {
super();
}
@Override
public void paint(Graphics g) {
g.setColor(lineColor);
g.drawLine(x1, y1, x2, y2);
}
}
public class Circle implements Shape {
// 圆的颜色
private Color circleColor;
// 圆心的坐标
private int x, y;
// 圆的半径
private int radius;
public Circle() {
super();
}
public Circle(int x, int y, int radius, Color circleColor) {
super();
this.circleColor = circleColor;
this.x = x;
this.y = y;
this.radius = radius;
}
@Override
public void paint(Graphics g) {
g.setColor(circleColor);
// 画弧, 当弧的宽度和高度一致且从0~360度时就是原形了
g.drawArc(x, y, radius, radius, 0, 360);
}
}
public class SketchpadPanel extends Canvas implements MouseListener, MouseMotionListener {
private static final long serialVersionUID = -5229161042153132522L;
// 鼠标点击起始坐标和当前坐标
private int beginX = 0, beginY = 0, currentX = 0, currentY = 0;
// 判断鼠标是否被按下
private boolean isMousePressing = false;
// 保存当前的图形, 在撤销和恢复时使用
private final StackShape currentShapes = new StackShape();
// 保存已经删除过的图形
private final StackShape deletedShapes = new StackShape();
private ShapeTypes type;
private Color color;
public SketchpadPanel() {
addMouseListener(this);
addMouseMotionListener(this);
}
/**
* 撤销方法
*/
public void undo() {
if (currentShapes.size() 0) {
// 从所有保存过的图形中取出最后一个, 放入到已删除的图形中去
Shape shape = currentShapes.pop();
deletedShapes.push(shape);
repaint();
}
}
/**
* 恢复撤销方法
*/
public void redo() {
if (deletedShapes.size() 0) {
// 从所有删除的图形中取出最后一个, 放入保存的图形中
Shape shape = deletedShapes.pop();
currentShapes.push(shape);
repaint();
}
}
/**
* 设置命令
*
* @param type
*/
public void setShapeType(ShapeTypes type) {
this.type = type;
}
/**
* 设置颜色
*
* @param color
*/
public void setColor(Color color) {
this.color = color;
}
public void updete(Graphics g) {
paint(g);
}
/**
* 绘制画板
*/
@Override
public void paint(Graphics g) {
// 绘制画板
Dimension size = getSize();
int width = size.width;
int height = size.height;
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 绘制所有图形
Shape shape = null;
EnumerationShape e = currentShapes.elements();
while (e.hasMoreElements()) {
shape = e.nextElement();
shape.paint(g);
}
// 如果当前鼠标没有释放
if (isMousePressing) {
g.setColor(color);
switch (type) {
// 绘制直线
case LINE:
g.drawLine(beginX, beginY, currentX, currentY);
break;
// 绘制矩形
case RECTANGLE:
if (currentX beginX) {
if (currentY beginY) {
// 如果当前位置在起始位置的左上方, 则以鼠标当前位置为矩形的左上角位置
g.drawRect(currentX, currentY, beginX - currentX, beginY - currentY);
} else {
// 如果当前位置在起始位置的左下方, 则以鼠标当前位置的横坐标和起始位置的纵坐标作为矩形的左上角位置
g.drawRect(currentX, beginY, beginX - currentX, currentY - beginY);
}
} else {
if (currentY beginY) {
// 如果当前位置在起始位置的右上方, 则以鼠标起始位置的很坐标和当前位置的纵坐标作为矩形的左上角位置
g.drawRect(beginX, currentY, currentX - beginX, beginY - currentY);
} else {
// 如果当前位置在起始位置的右下方, 则已起始位置作为矩形的左上叫位置
g.drawRect(beginX, beginY, currentX - beginX, currentY - beginY);
}
}
break;
// 绘制圆形
case CIRCLE:
// 半径为a*a + b*b的平方根
int radius = (int) Math
.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));
g.drawArc(beginX - radius / 2, beginY - radius / 2, radius, radius, 0, 360);
break;
}
}
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
/**
* 当鼠标按下的时候获得起始坐标
*/
@Override
public void mousePressed(MouseEvent e) {
beginX = e.getX();
beginY = e.getY();
isMousePressing = true;
}
/**
* 当鼠标释放时获得当前坐标
*/
@Override
public void mouseReleased(MouseEvent e) {
currentX = e.getX();
currentY = e.getY();
isMousePressing = false;
// 当释放鼠标时, 将绘制的图形保存到shapes中
switch (type) {
// 绘制直线
case LINE:
Line line = new Line(beginX, beginY, currentX, currentY, color);
currentShapes.push(line);
break;
// 绘制圆形
case CIRCLE:
// 半径为a*a + b*b的平方根
int radius = (int) Math
.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));
Circle circle = new Circle(beginX - radius / 2, beginY - radius / 2, radius, color);
currentShapes.push(circle);
break;
// 绘制矩形
case RECTANGLE:
Rectangle rectangle = null;
if (currentX beginX) {
if (currentY beginY) {
rectangle = new Rectangle(currentX, currentY, beginX - currentX, beginY - currentY, color);
} else {
rectangle = new Rectangle(currentX, beginY, beginX - currentX, currentY - beginY, color);
}
} else {
if (currentY beginY) {
rectangle = new Rectangle(beginX, currentY, currentX - beginX, beginY - currentY, color);
} else {
rectangle = new Rectangle(beginX, beginY, currentX - beginX, currentY - beginY, color);
}
}
currentShapes.push(rectangle);
break;
}
repaint();
}
@Override
public void mouseDragged(MouseEvent e) {
currentX = e.getX();
currentY = e.getY();
this.repaint();
}
@Override
public void mouseMoved(MouseEvent e) {
}
}
public class SketchpadFrame extends JFrame {
private static final long serialVersionUID = -7080053971741609904L;
private final JPanel commandPanel = new JPanel(); // 存放命令的面板
private final JPanel colorPanel = new JPanel(); // 存放颜色的面板
private final JPanel mainPanel = new JPanel(); // 主面板
private final JButton redButton = new JButton("红色");
private final JButton blueButton = new JButton("蓝色");
private final JButton greenButton = new JButton("绿色");
private final JButton lineButton = new JButton("直线");
private final JButton circleButton = new JButton("圆");
private final JButton rectangleButton = new JButton("矩形");
private final JButton undoButton = new JButton("撤销");
private final JButton redoButton = new JButton("恢复撤销");
private final JButton exitButton = new JButton("退出");
SketchpadPanel sketchPanel = new SketchpadPanel();
private void initFrame() {
commandPanel.setLayout(new FlowLayout());
commandPanel.add(lineButton);
commandPanel.add(circleButton);
commandPanel.add(rectangleButton);
commandPanel.add(undoButton);
commandPanel.add(redoButton);
commandPanel.add(exitButton);
colorPanel.setLayout(new FlowLayout());
colorPanel.add(redButton);
colorPanel.add(blueButton);
colorPanel.add(greenButton);
mainPanel.setLayout(new BorderLayout());
mainPanel.add(commandPanel, BorderLayout.NORTH);
mainPanel.add(colorPanel, BorderLayout.CENTER);
getContentPane().add("South", mainPanel);
getContentPane().add("Center", sketchPanel);
// 初始化设置:颜色和命令
lineButton.setForeground(Color.RED);
sketchPanel.setColor(Color.RED);
redButton.setForeground(Color.RED);
sketchPanel.setShapeType(ShapeTypes.LINE);
}
private void initListener() {
redButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
redAction(e);
}
});
blueButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
blueAction(e);
}
});
greenButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
greenAction(e);
}
});
undoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
undoAction(e);
}
});
redoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
redoAction(e);
}
});
exitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
exitAction(e);
}
});
lineButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
lineAction(e);
}
});
circleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
circleAction(e);
}
});
rectangleButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
rectangleAction(e);
}
});
}
public SketchpadFrame() {
initFrame();
initListener();
this.setSize(500, 600);
setLocationByPlatform(true);
setResizable(true);
}
/* ********************处理事件********************* */
private void undoAction(ActionEvent e) {
sketchPanel.undo();
}
private void redoAction(ActionEvent e) {
sketchPanel.redo();
}
private void exitAction(ActionEvent e) {
System.exit(0);
}
private void lineAction(ActionEvent e) {
// 选中按钮为红色, 其余为黑色
lineButton.setForeground(Color.RED);
circleButton.setForeground(Color.BLACK);
rectangleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.LINE);
}
private void circleAction(ActionEvent e) {
circleButton.setForeground(Color.RED);
lineButton.setForeground(Color.BLACK);
rectangleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.CIRCLE);
}
private void rectangleAction(ActionEvent e) {
rectangleButton.setForeground(Color.RED);
lineButton.setForeground(Color.BLACK);
circleButton.setForeground(Color.BLACK);
sketchPanel.setShapeType(ShapeTypes.RECTANGLE);
}
private void redAction(ActionEvent e) {
redButton.setForeground(Color.RED);
blueButton.setForeground(Color.BLACK);
greenButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.RED);
}
private void blueAction(ActionEvent e) {
blueButton.setForeground(Color.RED);
redButton.setForeground(Color.BLACK);
greenButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.BLUE);
}
private void greenAction(ActionEvent e) {
greenButton.setForeground(Color.RED);
redButton.setForeground(Color.BLACK);
blueButton.setForeground(Color.BLACK);
sketchPanel.setColor(Color.GREEN);
}
}
/**
*
* @author 不落的太阳(Sean Yang)
* @version 1.0
* @since JDK 1.8
*
*/
public class SketchpadMain {
/**
* 测试方法
*
* @param args命令行参数
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new SketchpadFrame();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}
}
像这种图形对称的由少变多再变少可以考虑绝对值控制。
打个比方：就像在一个数轴上，越接近中心则距离越短，然后过了中心后，就会离中心越来越远。代码如下，如果n是可输入的，你用IO输入流代替即可。
public static void main(String[] args){
int n = 5;//*号的行数
/*控制*号的数量，最小为1，最大为n，由绝对值计算出变化*/
int m = 1;
int space = (n + 1) / 2;//空格的最大值
int s = 1;//和上面同理
for(int i = 0; i n; i++){
//控制空格输出
for(int j = 0; j Math.abs(space-s); j++){
System.out.print(" ");
}
s++;
//控制*号输出
for(int k = 0; k n - Math.abs(n - m); k++){
System.out.print("*");
}
m += 2;
System.out.println();
}
}
package epm.mp.gateway.util;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
public class Rose extends JFrame implements ComponentListener, ItemListener {
private JComboBox comboboxColor;
// 颜色组合框
public Rose() {
super("玫瑰线");
this.setSize(600, 400);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setLayout(new FlowLayout());
Object data[] = { Color.red, Color.green, Color.blue };
comboboxColor = new JComboBox(data);
// 颜色组合框
comboboxColor.addItemListener(this);
// 注册组合框的选择事件监听器
this.add(comboboxColor);
this.addComponentListener(this);
// 注册框架窗口的选择事件监听器
this.setVisible(true);
this.validate();
}
//r=asin3θ
//转化为直角坐标系
// 输入下面程序用于输出三叶玫瑰线的图形，三叶玫瑰线的参数方程为：
// x = r * sin(3t)* cos(t);
//y = r *sin(3t) * sin(t)
//其中: 0 = t = 2 * 3.14159
//
public void paint(Graphics g){
paint(g,3);
}
public void paint(Graphics g,int roses) {
int x0, y0;
// 原点坐标
x0 = this.getWidth() / 2;
// 窗口的宽度
y0 = this.getHeight() / 2;
g.setColor((Color) comboboxColor.getSelectedItem());
// 设置画线颜色为组合框选中颜色
g.drawLine(x0, 0, x0, y0 * 2);
g.drawLine(0, y0, x0 * 2, y0);
int j = 0;
while (j 200) {
for (int i = 0; i 1023; i++) {
double angle = i * Math.PI / 512;
double radius = j * Math.sin(roses * angle);
int x = (int) Math.round(radius * Math.cos(angle) );
int y = (int) Math.round(radius * Math.sin(angle));
g.fillOval(x0 + x, y0 + y, 1, 1);//画点
}
j += 10;
}
}
public void itemStateChanged(ItemEvent e) {
// 选中单选按钮
repaint();
// 重画
}
public void componentResized(ComponentEvent e) {
// 改变窗口大小时
repaint();
}
public void componentMoved(ComponentEvent e) {
}
public void componentHidden(ComponentEvent e) {
}
public void componentShown(ComponentEvent e) {
}
public static void main(String[] arg) {
new Rose();
}
}
java 输出菱形代码：
System.out.print(" ");
for (k = 1; k = 2 * i - 1; k++)
System.out.print("*");
System.out.println("");
}
for (i = 1; i = 4; i++) {
for (j = 1; j = i; j++)
System.out.print(" ");
for (k = 1; k = 9 - 2 * i; k++)
System.out.print("*");
System.out.println("");
}
}
}
绘制算法：
1、分为两部分，上半部分和下半部分
2、输出空格部分换个输出*部分
3、最后一个标签需要换行
支持一楼，另附上另一方法，利用数组亦可！方法如下：
声明数组String[] array = new String[5];
array[0]="*";
array[1]="**";
array[2]="***";
array[3]="****";
array[4]="*****";
使用一楼仁兄的方法输出下标0-4的图形，即 * ** *** **** *****
不换行再倒序输出一次！
思想：一个需求的满足有多种方案，在你的题目中，我根据你的需求，将你的图形以对称轴为中心的两部分，这是数组中常用的手段，利用对称进行 正、反 输出！
示例：
public class HelloJccp {
static String[] array=new String[5];
public static String printXing(){
return "*";
}
// i 为数组下标
public static String print(int i){
String charector = ""; // 符号变量 *
for(int j=0;j=i;j++){
charector=printXing()+charector;
}
return charector;
}
public static void main(String[] args){
for(int i=0;iarray.length;i++){
array[i] = print(i);
System.out.print(" ");
System.out.print(array[i]);
}
for(int i=array.length-1;i=0;i--){
System.out.print(array[i]);
System.out.print(" ");
}
}
}