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java 点での描画

Last updated at Posted at 2015-11-26

点での描画を今回しました。画像では点ですが、drawLineを使って点を描画しています。
スクリーンショット 2015-11-26 14.48.43.png

下はコードです。

Graphics2DTest1.java
import javax.swing.*;
import java.awt.Graphics;
import java.awt.Insets;

public class Graphics2DTest1 extends JPanel{
	int x = 1;
	int y = 400;
	
	int r = 100;
	int cx, cy;
	
	
	int movex;
	int movey;

  public static void main(String[] args){
    JFrame frame = new JFrame();

    Graphics2DTest1 app = new Graphics2DTest1();
    frame.getContentPane().add(app);
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(0, 0, 400, 400);
    frame.setTitle("タイトル");
    frame.setVisible(true);
    Insets insets = frame.getInsets();
    frame.setSize(400 + insets.left + insets.right, 400 + insets.top + insets.bottom);
  }

  public void paintComponent(Graphics g){
	 g.drawLine(0,200,400,200);
	 g.drawLine(200,0,200,400);
	 array(g);
	 Circle(g);
	 oval(g);
  }
  
  public void array(Graphics g){
	  for(int i = 0; i <= 400; i++){
		  g.drawLine(x + i ,y - i,x + i,y - i);
		  movex += 1;
		  movey -= 1;
	  }
   }
   
  
  public void Circle(Graphics g){
	  for(int i = 0; i < 360; i++){
		  cy = (int) (200 + Math.sin(i) * r);
		  cx = (int) (200 + Math.cos(i) * r);
		  g.drawLine(cx, cy, cx, cy);
	  }
  }
  
  public void oval(Graphics g){
	  for(int i = 0; i < 360; i++){
		  cy = (int) (200 + Math.sin(i) * r / 2);
		  cx = (int) (200 + Math.cos(i) * r);
		  g.drawLine(cx, cy, cx, cy);
	  }
  }
}

キャストをして、すべてint型で作っています。点のズレなどはそのせいです。

ターミナルで実行する場合は下のコマンドを打ってください。
$ javac Graphics2DTest1.java
$ java Graphics2DTest1

で実行可能です。

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