用Java做定制圣诞树
蹭个热度用Java画个圣诞树，整体思路就是先画树和灯，画完以后加顶端的星星，之后再加飘雪特效和音乐，最后另做一个窗口，用来读取用户自定义的参数。首先是画树和灯（Tree.java），这里主要是用 fillRect和fillOval来画，最后效果如下：这里用两张图是想说明，灯串其实做了闪烁效果，也就是repaint的时候，灯的颜色会由有色变无色，无色变有色，所以为了呈现效果，我把树中间的空隙也用fi
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蹭个热度用Java画个圣诞树，整体思路就是先画树和灯，画完以后加顶端的星星，之后再加飘雪特效和音乐，最后另做一个窗口，用来读取用户自定义的参数。
首先是画树和灯（Tree.java），这里主要是用 fillRect 和 fillOval来画，最后效果如下：
这里用两张图是想说明，灯串其实做了闪烁效果，也就是repaint的时候，灯的颜色会由有色变无色，无色变有色，所以为了呈现效果，我把树中间的空隙也用fillRect画上了背景色。
接下来是画顶端的星星和飘雪特效（Snow.java），这里为了图方便，飘雪特效用的是自己画的GIF图，星星则是一个button，点击可打开/关闭飘雪特效。同时BGM也放在了这个类里。
最后就是自定义部分。颜色部分（RGB.java）用到了ColorChooser类来选择颜色，还有一个JRadioButton来选择是否使用默认颜色。而树高部分（Xmas.java）则是用的JComboBox来选择对应高度（高度会影响之后画有圣诞树的窗口的大小）。为了美观（乐趣？），我还做了一个开始页面，效果如下：
开始页面：
自定义页面：
完整代码如下：
public class Xmas extends JFrame implements ActionListener{
private int Width, Height;
private boolean submit = false;
JLayeredPane lp = new JLayeredPane();
JLabel ct;
JButton button;
JComboBox<Integer> layerSelected = new JComboBox<>(new MyComboBox());
RGB p1, p2, p3, p4;
ArrayList<Integer> colours = new ArrayList<Integer>();
public Xmas() {
this.setTitle("狐狸子的圣诞树售卖店");
URL iconUrl = this.getClass().getResource("/sources/tree.png");
Image tree = Toolkit.getDefaultToolkit().getImage(iconUrl);
this.setIconImage(tree);
this.setLayout(null);
this.setResizable(false);
this.setSize(800, 650);
this.setLocationRelativeTo(null); //Put the window to the centre of the screen
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
/*Set the background picture*/
URL imgUrl = this.getClass().getResource("/sources/Background.jpg");
ImageIcon background = new ImageIcon(imgUrl);
JLabel bg = new JLabel(background);
bg.setBounds(0, 0, background.getIconWidth(), background.getIconHeight());
/*Set the content*/
URL contentUrl = this.getClass().getResource("/sources/Content.png");
ImageIcon content = new ImageIcon(contentUrl);
ct = new JLabel(content);
ct.setBounds(30, 50, content.getIconWidth(), content.getIconHeight());
/*Create the start button*/
button = new JButton("");
URL url = this.getClass().getResource("/sources/Start.png");
ImageIcon start = new ImageIcon(url);
button.setIcon(start);
button.setBorder(null);
button.setContentAreaFilled(false);
button.setBounds(150, 430, 200, 55);
button.addActionListener(this);
lp.add(bg, new Integer(100));
lp.add(ct, new Integer(150));
lp.add(button, new Integer(200));
this.setContentPane(lp);
}
public Xmas(int layer, ArrayList<Integer>c) {
this.setTitle("点击星星有惊喜呦╰(*°▽°*)╯");
this.setLayout(null);
this.setBackground(new Color(c.get(0), c.get(1), c.get(2)));
Width = (layer*4+3) * 17 + 150;
Height = (layer*4+2) *17 + 150;
this.setSize(Width, Height);
this.setResizable(false);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Tree tree = new Tree(layer, c);
this.setContentPane(tree);
Snow snow = new Snow(layer);
this.setGlassPane(snow);
snow.setOpaque(false);
this.getGlassPane().setVisible(true);
this.validate();
}
@Override
public void actionPerformed(ActionEvent arg0) {
if (!submit) {
/*Remove the landing page's component*/
ct.setVisible(false);
/*Change the content*/
URL imgUrl = this.getClass().getResource("/sources/Data.png");
ImageIcon customize = new ImageIcon(imgUrl);
JLabel cm = new JLabel(customize);
cm.setBounds(30, 50, customize.getIconWidth(), customize.getIconHeight());
/*Change the button*/
URL url = this.getClass().getResource("/sources/Submit.png");
ImageIcon submit = new ImageIcon(url);
button.setIcon(submit);
button.setBorder(null);
button.setContentAreaFilled(false);
button.setBounds(75, 430, submit.getIconWidth(), submit.getIconHeight());
button.addActionListener(this);
/*Make a combo box*/
layerSelected.setBounds(215, 65, 75, 35);
/*custom color*/
p1 = new RGB(166, 27, 41); //Background colour
p1.setBounds(270, 260, 300, 40);
p1.setOpaque(false);
p2 = new RGB(67, 178, 68); //Leafs colour
p2.setBounds(310, 290, 220, 40);
p2.setOpaque(false);
p3 = new RGB(92, 55, 25); //Root colour
p3.setBounds(310, 320, 220, 40);
p3.setOpaque(false);
p4 = new RGB(248, 223, 112); //Light colour
p4.setBounds(310, 350, 220, 40);
p4.setOpaque(false);
lp.add(p1, new Integer(260));
lp.add(p2, new Integer(262));
lp.add(p3, new Integer(264));
lp.add(p4, new Integer(268));
lp.add(cm, new Integer(270));
lp.add(layerSelected, new Integer(300));
} else {
colours.add(p1.getRedValue());
colours.add(p1.getGreenValue());
colours.add(p1.getBlueValue());
colours.add(p2.getRedValue());
colours.add(p2.getGreenValue());
colours.add(p2.getBlueValue());
colours.add(p3.getRedValue());
colours.add(p3.getGreenValue());
colours.add(p3.getBlueValue());
colours.add(p4.getRedValue());
colours.add(p4.getGreenValue());
colours.add(p4.getBlueValue());
this.dispose();
int height = (int)layerSelected.getSelectedItem();
Xmas c = new Xmas(height, colours);
c.setVisible(true);
}
submit = !submit;
}
}
public class RGB extends JPanel implements ActionListener{
final int[] defaultColor = new int[3];
int[] rgb = new int[3];
final JLabel label = new JLabel(" ");
JButton cc = new JButton("选择颜色");
JRadioButton customize = new JRadioButton("默认色", false);
public RGB(int r, int g, int b) {
FlowLayout f = (FlowLayout)this.getLayout();
f.setHgap(15);
/*Save the RGB value of the default colour*/
defaultColor[0] = r;
defaultColor[1] = g;
defaultColor[2] = b;
/*Set the colour as default colour*/
rgb[0] = defaultColor[0];
rgb[1] = defaultColor[1];
rgb[2] = defaultColor[2];
/*Make the colour chooser's button*/
cc.addActionListener(this);
cc.setSize(70, 35);
/*Make the colour block*/
label.setOpaque(true);
label.setSize(35, 35);
label.setBackground(new Color(r, g, b));
/*Make the JRadioButton for the default color*/
customize.setSize(30, 35);
customize.setOpaque(true);
customize.setBorder(null);
customize.setContentAreaFilled(false);
customize.addActionListener(this);
this.add(label);
this.add(cc);
this.add(customize);
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == customize) {
cc.setEnabled(!customize.isSelected());
rgb[0] = defaultColor[0];
rgb[1] = defaultColor[1];
rgb[2] = defaultColor[2];
label.setBackground(new Color(rgb[0], rgb[1], rgb[2]));
}
if (e.getSource() == cc && (!customize.isSelected())) {
Color color = JColorChooser.showDialog(this, "选取颜色", null);
if (color == null) {
return;
}
label.setBackground(color);
rgb[0] = color.getRed();
rgb[1] = color.getGreen();
rgb[2] = color.getBlue();
}
}
public int getRedValue() {
return rgb[0];
}
public int getGreenValue() {
return rgb[1];
}
public int getBlueValue() {
return rgb[2];
}
}public class MyComboBox extends AbstractListModel<Integer> implements ComboBoxModel<Integer>{
private final int[] layers = {5, 6, 7, 8, 9, 10, 11};
int selectedItem;
public MyComboBox() {
this.setSelectedItem(this.getElementAt(0));
}
@Override
public Integer getElementAt(int index) {
return layers[index];
}
@Override
public int getSize() {
return layers.length;
}
@Override
public Object getSelectedItem() {
return selectedItem;
}
@Override
public void setSelectedItem(Object item) {
selectedItem = (int) item;
}
}public class Tree extends JPanel implements ActionListener{
private int x;
private int y;
private int[] range;
private int endY;
private final int layer;
private boolean change = false;
Timer time;
private ArrayList<Integer> colours = new ArrayList<Integer>();
public Tree(int layer, ArrayList<Integer> cs) {
this.layer = layer;
this.colours.addAll(cs);
this.setLayout(null);
range = new int[layer *8];
time = new Timer(300, this);
time.start();
}
public void paintComponent(Graphics g) {
//super.paint(g);
this.drawLeafs(g);
this.drawRoot(g);
if (change) {
this.drawBalls(g, 0);
} else {
this.drawBalls(g, 1);
}
}
public void actionPerformed(ActionEvent e) {
this.repaint();
change = !change;
}
private void drawLeafs(Graphics g) {
x = 50;
y = 50;
int maxLeafs = layer*4 + 3;
int leaf = 1;
int pos = maxLeafs/2 + 1;
int index = 0;
for (int i = 0; i < layer; i++) {
for (int j = 0; j < 4; j++) {
x = x + 17 * pos; //Find the start position
range[index] = x; //Record the start position of this line
index++;
for (int k = 0; k < leaf; k++) {
g.setColor(new Color(colours.get(3), colours.get(4), colours.get(5))); //Draw the leafs
g.fillRect(x, y, 15, 15);
g.setColor(new Color(colours.get(0), colours.get(1), colours.get(2))); //Fill the space
g.fillRect(x+15, y, 2, 15);
g.fillRect(x, y+15, 17, 2);
x += 17;
}
range[index] = x; //Record the end position of this line
index++;
leaf += 2; //The number of leafs will increase by 2 for each line
pos --;
x = 50;
y += 17;
}
leaf -= 4;
pos += 2;
}
endY = y;
}
private void drawRoot(Graphics g) {
x = 50;
y = endY;
for (int i = 0; i < 3; i++) {
x = x + 17*(layer + 2);
g.setColor(new Color(colours.get(6), colours.get(7), colours.get(8)));
for (int j = 0; j < (2*layer+1); j++) {
g.fillRect(x, y, 15, 15);
x += 17;
}
x = 50;
y += 17;
}
}
private void drawBalls(Graphics g, int init) { //Set the first ball's colour
Color[] colors = {new Color(0, 0, 0, 0), new Color(colours.get(9), colours.get(10), colours.get(11))};
int lights = 3;
int winding = 15;
for (int i = 0; i < layer-2; i++) {
/* Calculate the corresponding x range*/
int line = i*4 + 6;
int xStart = range[line * 2];
int xEnd = range[line*2 + 1];
int range = (xEnd - xStart) / lights;
int xpos = xStart + 10;
int ypos = 50 + line * 17;
/*Start to draw the lights*/
for (int j = 0; j < lights/2 + 1; j++) {
g.setColor(colors[init % 2]);
g.fillOval(xpos, ypos, 23, 23);
init++;
xpos += range;
ypos += winding;
}
ypos -= 2*winding;
for (int j = lights/2 + 1; j < lights; j++) {
g.setColor(colors[init % 2]);
g.fillOval(xpos, ypos, 23, 23);
init++;
xpos += range;
ypos -= winding;
}
lights+=2;
winding--;
}
}
}public class Snow extends JPanel implements ActionListener{
JButton star = new JButton(); //Control the snow
AudioClip clip = null;
URL url = null;
JLabel snowy;
boolean play = true;
private final int Width;
public Snow(int layer) {
/* Play the BGM*/
url = this.getClass().getResource("/sources/music.wav");
clip = Applet.newAudioClip(url);
clip.loop();
/* Calculate the relevant parameters and timer*/
Width = (layer*4+3) * 17 + 150;
/* Create the snow button*/
URL imgUrl = this.getClass().getResource("/sources/Star.png");
ImageIcon icon = new ImageIcon(imgUrl); //Size: 50*50
star.setIcon(icon);
star.setBorder(null);
star.setContentAreaFilled(false);
star.setBounds(Width/2-40, 15, 50, 50);
//star.setBounds(0, 0, 50, 50);
star.addActionListener(this);
this.add(star);
this.snowy();
}
public void actionPerformed(ActionEvent e) {
if (play) {
snowy.setVisible(true);
} else {
snowy.setVisible(false);
}
play = !play;
}
private void snowy() { //Create the snow
URL imgUrl = this.getClass().getResource("/sources/Snowy.gif");
ImageIcon snow = new ImageIcon(imgUrl);
snowy = new JLabel(snow);
this.add(snowy);
snowy.setVisible(false);
}最后，祝大家平安夜，圣诞还有即将到来的新年快乐呀
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