Make a static tank

painting

Basic knowledge

To develop the tank war game , I think you should think about the following ：

• Make interface
• Draw a static tank

The above two questions are what this blog will take you to solve , To complete the above two challenges , You have to know Java A tool class provided

JFrame  It can be understood as a framework 

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JPanel  Can be understood as a sketchpad    If you want to paint 
 There must be a way to draw things on the board 
paint()

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Graphics g  This g It can be understood as a brush 

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First of all, you need to know , The drawing board should be placed on top of a frame , And the brush should draw the content , You must draw on the drawing board

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• So based on the above little knowledge , Then we can write the outline of the framework , Implement the above class through code

public class Tank extends JFrame {
    
    private Mypanel mp=null;
}
class Mypanel extends JPanel{
    
    @Override
    public void paint(Graphics g) {
    
		super.paint(g);
    }
}

• Just said , The most basic thing to make a page is to have a frame , Then there is the drawing board , So how to add the Sketchpad to the framework in the form of code ？ To find out , We need to know something about JFrame Some of the ways

  this.add(mp);
   This add The method is equivalent to putting our drawing board 
   Add to frame 
      
  this.setSize(1000,800);
   This is to set the size of the frame , Default color 
   It's white 
      
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   This method is when we click the exit interface to make ,
   Give Way JavaJVM The virtual machine also shuts down automatically 
      
  this.setVisible(true);
   This method is to make what we draw on the drawing board visible 
  

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Interface building

• With the above knowledge reserve , We can continue to adjust our interface construction

  public class Tank extends JFrame {
         
      private Mypanel mp=null;
  
      public Tank(){
         
          mp=new Mypanel();
          this.add(mp);
          this.setSize(1000,800);
          this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          this.setVisible(true);
      }
  
      public static void main(String[] args) {
         
          Tank tank = new Tank();
      }
  }
  class Mypanel extends JPanel{
         
      @Override
      public void paint(Graphics g) {
         
          super.paint(g);
      }
  }
  

  • The construction of such a basic framework and panel is completed

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Common graphic drawing methods

• Then we can simply draw some figures

  • Before painting , We need to know a little bit first , This paint() The method is to open the interface every time , Or panel redrawing , Or when the keyboard or mouse moves, it will be automatically called by the system

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  • The upper left corner of the Sketchpad is set as the origin , Horizontal axis x Axis , The vertical axis is y Axis , You should know very well from the picture I drew

      public void paint(Graphics g) {
         
          super.paint(g);
          g.drawLine(10,10,50,50);
           Draw a straight line    The first two parameters are  x y  Starting position   The last two parameters are of the end point  x y The location of 
              
          g.fillOval(20,20,30,30);
           To draw you first have to get to a point   He drew this in a rectangle 
           This is a painting   The first two parameters are the starting coordinates   Then, the last two parameters must be the same to ensure that a 
              
          g.setColor(Color.green);
           Set the color of the brush 
              
          g.drawString("Cx_330",100,100);
           Draw a string 
              
          g.fill3DRect(110,110,60,60,false);
  		 This is to draw 3D Rectangle of effect    Later parameters true perhaps false Fine    It depends on everyone's preferences 
              
          Image image=Toolkit.getDefaultToolkit().getImage(Panel.class.getResource("/b3.jpg"));
          g.drawImage(image,250,250,100,200,this);
           To draw a picture, you must first create a picture    The format is fixed , But one thing to note is that you have to put your picture in out Directory is the next level directory of your module . If you still don't understand, take a look at the screenshot of the module in the first blog 
      }
  

Painting tanks

Through this picture , You can know , It's easy to draw a tank , Just draw :

• Two identical rectangles As a tire
• A rectangle acts as a shell
• A circle serves as a lid
• A thin line acts as a cannon barrel

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• Knowing this , Then when drawing, you only need to understand the coordinates of each figure , length , Width , Then you can easily draw a tank , Before drawing, I suggest you try to draw a tank on the paper , Mark out the corresponding coordinates and then implement them in code. This will be very simple

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• Code demonstration

	drawTank(hero.getX(),hero.getY(),g,hero.getDirect(),0);   
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	public void drawTank(int x,int y,Graphics g,int direct,int type){
     

        //0 My tank  1 Enemy tanks 
        switch (type){
     
            case 0:
                g.setColor(Color.cyan);
                break;
            case 1:
                g.setColor(Color.green);
                break;
        }

        // Direction  (w 0 On  1d 2 Right  s 3 Next  a Left )
        switch (direct){
     
            case 0://
                g.fill3DRect(x,y,10,60,false);// Left wheel 
                g.fill3DRect(x+30,y,10,60,false);// Right wheel 
                g.fill3DRect(x+10,y+10,20,40,false);// Body frame 
                g.fillOval(x+10,y+20,20,20);// The lid 
                g.drawLine(x+20,y,x+20,y+20);// Barrel 
                break;
            case 1://
                g.fill3DRect(x,y,60,10,false);// Left wheel 
                g.fill3DRect(x,y+30,60,10,false);// Right wheel 
                g.fill3DRect(x+10,y+10,40,20,false);// Body frame 
                g.fillOval(x+20,y+10,20,20);// The lid 
                g.drawLine(x+60,y+20,x+20,y+20);// Barrel 
                break;
            case 2://
                g.fill3DRect(x,y,10,60,false);// Left wheel 
                g.fill3DRect(x+30,y,10,60,false);// Right wheel 
                g.fill3DRect(x+10,y+10,20,40,false);// Body frame 
                g.fillOval(x+10,y+20,20,20);// The lid 
                g.drawLine(x+20,y+20,x+20,y+60);// Barrel 
                break;
            case 3://
                g.fill3DRect(x,y,60,10,false);// Left wheel 
                g.fill3DRect(x,y+30,60,10,false);// Right wheel 
                g.fill3DRect(x+10,y+10,40,20,false);// Body frame 
                g.fillOval(x+20,y+10,20,20);// The lid 
                g.drawLine(x,y+20,x+20,y+20);// Barrel 
                break;
        }
    }