import java.awt.Graphics2D;
import java.awt.*;
//import javax.swing.*;
public class BackGround extends javax.swing.JPanel{
static int bx=90;
static int by=90;
static int OvalW=60;
static int OvalH=60;
static int r=30;
static int blank=5;
static int lLength=20;
static int moveL=(int)(1.4*blank);
static int moveC=(int)(0.7*lLength/2);
/** Creates a new instance of BackGround */
public BackGround() {
}
public BackGround(int x,int y) {
bx=x;
by=y;
}
public void paint(java.awt.Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D) g;
g2.setBackground(Color.white);
g2.setColor(Color.red);
g2.fillOval(bx,by,OvalW,OvalH);
g2.setColor(Color.yellow);
g2.drawLine((bx-moveL)-moveC,(by-moveL)+moveC,(bx-moveL)+moveC,(by-moveL)-moveC);//左上45度
g2.drawLine((bx-moveL)+moveC+lLength,(by-moveL)-moveC,(bx-moveL)+moveC+lLength+lLength,(by-moveL)-moveC);//上横线
g2.drawLine((bx+2*r+moveL)+moveC,(by-moveL)+moveC,(bx+2*r+moveL)-moveC,(by-moveL)-moveC);//右上45度
g2.drawLine((bx-moveL)+moveC+lLength,(by+2*r+moveL)+moveC,(bx-moveL)+moveC+lLength+lLength,(by+2*r+moveL)+moveC);//下横线
g2.drawLine((bx-moveL)-moveC,(by+2*r+moveL)-moveC,(bx-moveL)+moveC,(by+2*r+moveL)+moveC);//左下45度
g2.drawLine((bx+2*r+moveL)+moveC,(by+2*r+moveL)-moveC,(bx+2*r+moveL)-moveC,(by+2*r+moveL)+moveC);//右下45度
g2.drawLine((bx-moveL)-moveC,(by-moveL)+moveC+lLength,(bx-moveL)-moveC,(by-moveL)+moveC+lLength+lLength);//左竖线
g2.drawLine((bx+2*r+moveL)+moveC,(by-moveL)+moveC+lLength,(bx+2*r+moveL)+moveC,(by-moveL)+moveC+lLength+lLength);//右竖线
/*g.drawLine(bx-blank,by+r,bx-lLength-blank,by+r);//左边横线
g.drawLine(bx-blank+blank+2*r+lLength,by+r,bx-lLength-blank+blank+2*r+lLength+blank,by+r);//右边横线
g.drawLine(bx,by-(int)(blank*0.8),bx-blank+(int)(r*0.5)-(int)(lLength*0.5)-blank*2,by);//左边60度线
//g.drawLine(bx-(int)(blank*0.5)+(int)(r*0.5)-blank*2,by-(int)(blank*0.8),bx-blank+(int)(r*0.5)-(int)(lLength*0.5)-blank*2,by-(int)(blank*0.8)-(int)(lLength*0.8))
g.drawLine(bx-((int)(blank*0.5))+((int)(r*0.5))+2*r-lLength+2*blank,by-((int)(blank*0.8)),bx-blank+((int)(r*0.5))-((int)(lLength*0.5))+2*r+2*blank,by-((int)(blank*0.8))-((int)(lLength*0.8)));//右边近60度线
g.drawLine(bx+r,by-blank-lLength,bx+r,by-blank-lLength+lLength);//垂直上面的线
g.drawLine(bx+r,by-blank-lLength+blank+lLength+blank+2*r+lLength,bx+r,by-blank-lLength+lLength+blank+2*r+blank);//垂直下面的线
g.drawLine(bx-(int)(blank*0.5)+(int)(r*0.5)-blank*2+(int)((2*blank)*0.5+2*r),by-(int)(blank*0.8)+(int)((2*blank)*0.8)+2*r,bx-blank+(int)(r*0.5)-(int)(lLength*0.5)-blank*2+(int)((2*blank+2*lLength)*0.5)+2*r,by-(int)(blank*0.8)-(int)(lLength*0.8)+(int)((2*blank+2*lLength)*0.8)+2*r);//**/
//g.drawLine(bx-(int)(blank*0.5)+(int)(r*0.5)-blank*2+2*r+())
/*g.drawLine(75,65,95,85);
g.drawLine(60,120,85,120);
g.drawLine(152,120,172,120);
g.drawLine(152,142,172,162);
g.drawLine(145,60,130,85);
g.drawLine(100,125,85,150);*/
//第一个三角形的顶点
int treeTopX1=(bx-moveL)+moveC+lLength+lLength/2;
int treeTopY1=(by+2*r+moveL)+moveC+2*5*lLength;
int i=1;
int triangleL=(int)(0.7*2*i*lLength);
//第一个三角形的点
int xPoints[]={treeTopX1,treeTopX1-triangleL,treeTopX1+triangleL};
int yPoints[]={treeTopY1,treeTopY1+triangleL,treeTopY1+triangleL};
g2.setColor(Color.green);
g2.fillPolygon(xPoints, yPoints, 3);
//第二个三角形的顶点
int treeTopX2=treeTopX1;
int treeTopY2=treeTopY1+triangleL;
i++;
triangleL=(int)(0.7*2*i*lLength);
//第二个三角形的点
int xPoints1[]={treeTopX2,treeTopX2-triangleL,treeTopX2+triangleL};
int yPoints1[]={treeTopY2,treeTopY2+triangleL,treeTopY2+triangleL};
g2.fillPolygon(xPoints1, yPoints1, 3);
//第三个三角形的顶点
int treeTopX3=treeTopX2;
int treeTopY3=treeTopY2+triangleL;
i++;
triangleL=(int)(0.7*2*i*lLength);
//第三个三角形的点
int xPoints2[]={treeTopX3,treeTopX3-triangleL,treeTopX3+triangleL};
int yPoints2[]={treeTopY3,treeTopY3+triangleL,treeTopY3+triangleL};
g2.fillPolygon(xPoints2, yPoints2, 3);
g2.setColor(Color.GRAY);
//树根
g2.fillRect(treeTopX3-triangleL+triangleL/4*3,treeTopY3+triangleL,triangleL/2, triangleL/2);
}
/*public static void main(String args[]) {
new BackGround();
}*/
}
import java.awt.*;
public class Back extends javax.swing.JFrame {
/** Creates new form Back */
public Back() {
initComponents();
BackGround background =new BackGround();
background.setOpaque(true);
this.getContentPane().add(background);
}
public void paint(java.awt.Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D) g;
//g2.setBackground(Color.white);
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents() {
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
});
pack();
}
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
Back back=new Back();
//back.setBackground(Color.white);
//back.setVisible(true);
back.show();
}
// Variables declaration - do not modify
// End of variables declaration
}
7 个解决方案
#1
顶
#2
怎么没人看吗，顶
#3
把setBackground(Color.white);写在最后就可以了！
。。。
int xPoints2[]={treeTopX3,treeTopX3-triangleL,treeTopX3+triangleL};
int yPoints2[]={treeTopY3,treeTopY3+triangleL,treeTopY3+triangleL};
g2.fillPolygon(xPoints2, yPoints2, 3);
g2.setColor(Color.GRAY);
//树根
g2.fillRect(treeTopX3-triangleL+triangleL/4*3,treeTopY3+triangleL,triangleL/2, triangleL/2);
setBackground(Color.white);
}
/*public static void main(String args[]) {
new BackGround();
}*/
}
。。。
int xPoints2[]={treeTopX3,treeTopX3-triangleL,treeTopX3+triangleL};
int yPoints2[]={treeTopY3,treeTopY3+triangleL,treeTopY3+triangleL};
g2.fillPolygon(xPoints2, yPoints2, 3);
g2.setColor(Color.GRAY);
//树根
g2.fillRect(treeTopX3-triangleL+triangleL/4*3,treeTopY3+triangleL,triangleL/2, triangleL/2);
setBackground(Color.white);
}
/*public static void main(String args[]) {
new BackGround();
}*/
}
#4
谢谢。现在我需要在jframe中设置背景颜色（因为我所画的东西都做成了jpanel，把它们都加在jframe上），但是现在在jframe中的paint方法中setBackground(Color.white)之后整个全变白了，我那些panel上画的东西也不见了，我把panel设成不透明也不行。
#5
现在我把所有的东西都直接画在jframe上，其上有一个jlabel，怎么才能把jframe的背景设成想要的颜色，直接在paint方法中setBackround不好使。
#6
i know,需要在构造函数中，getContentPane().setBackground()设置颜色，谢谢 Albert_1030()
#7
不错 谢谢!
#1
顶
#2
怎么没人看吗，顶
#3
把setBackground(Color.white);写在最后就可以了！
。。。
int xPoints2[]={treeTopX3,treeTopX3-triangleL,treeTopX3+triangleL};
int yPoints2[]={treeTopY3,treeTopY3+triangleL,treeTopY3+triangleL};
g2.fillPolygon(xPoints2, yPoints2, 3);
g2.setColor(Color.GRAY);
//树根
g2.fillRect(treeTopX3-triangleL+triangleL/4*3,treeTopY3+triangleL,triangleL/2, triangleL/2);
setBackground(Color.white);
}
/*public static void main(String args[]) {
new BackGround();
}*/
}
。。。
int xPoints2[]={treeTopX3,treeTopX3-triangleL,treeTopX3+triangleL};
int yPoints2[]={treeTopY3,treeTopY3+triangleL,treeTopY3+triangleL};
g2.fillPolygon(xPoints2, yPoints2, 3);
g2.setColor(Color.GRAY);
//树根
g2.fillRect(treeTopX3-triangleL+triangleL/4*3,treeTopY3+triangleL,triangleL/2, triangleL/2);
setBackground(Color.white);
}
/*public static void main(String args[]) {
new BackGround();
}*/
}
#4
谢谢。现在我需要在jframe中设置背景颜色（因为我所画的东西都做成了jpanel，把它们都加在jframe上），但是现在在jframe中的paint方法中setBackground(Color.white)之后整个全变白了，我那些panel上画的东西也不见了，我把panel设成不透明也不行。
#5
现在我把所有的东西都直接画在jframe上，其上有一个jlabel，怎么才能把jframe的背景设成想要的颜色，直接在paint方法中setBackround不好使。
#6
i know,需要在构造函数中，getContentPane().setBackground()设置颜色，谢谢 Albert_1030()
#7
不错 谢谢!