如何用Java编写五星红旗的绘制代码？ |21xrx.com

如何用Java编写五星红旗的绘制代码？

2023-06-12 12:09:55 深夜i -- --

Java 绘制API Graphics2D 五星红旗代码

随着计算机技术的不断发展，使用程序编写图形界面的代码已经成为一种趋势。那么如何使用Java语言编写五星红旗的绘制代码呢？下面我们就来详细探讨一下。

首先，我们需要了解五星红旗的构造。五星红旗的标志共由红色底布、大星、四个小星组成。其中大星外接圆半径为旗面高度的1/10，小星外接圆半径为大星外接圆半径的3/10。

为了编写五星红旗的代码，我们需要借助Java的绘图API。Java的Graphics类是一个抽象类，而它的子类Graphics2D则提供了更为丰富的图形绘制方法。我们可以使用Graphics2D类提供的绘制矩形、线段、圆形和多边形等方法，来绘制五星红旗的构成部分。

以下是实现五星红旗的代码示例：


import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Path2D;
public class DrawFlag {
  private final static int WIDTH = 400;
  private final static int HEIGHT = 280;
  private final static int BIG_STAR_RADIUS = HEIGHT / 10;
  private final static int SMALL_STAR_RADIUS = BIG_STAR_RADIUS * 3;
  public static void main(String[] args) {
    Flag flag = new Flag();
    flag.draw();
  }
  static class Flag {
    private Graphics2D g2d;
    public Flag() {
      g2d = createGraphics2D();
    }
    public void draw() {
      g2d.setColor(Color.RED);
      g2d.fillRect(0, 0, WIDTH, HEIGHT);
      g2d.setColor(Color.YELLOW);
      drawBigStar(WIDTH / 3, HEIGHT / 3);
      drawSmallStar(WIDTH / 3 + BIG_STAR_RADIUS / 2,
          HEIGHT / 3 - SMALL_STAR_RADIUS / 2);
      drawSmallStar(WIDTH / 3 + BIG_STAR_RADIUS / 2,
          HEIGHT / 3 + BIG_STAR_RADIUS / 2 - SMALL_STAR_RADIUS / 2);
      drawSmallStar(WIDTH / 3 - SMALL_STAR_RADIUS / 2,
          HEIGHT / 3 + BIG_STAR_RADIUS / 2 - SMALL_STAR_RADIUS / 2);
      drawSmallStar(WIDTH / 3 - SMALL_STAR_RADIUS / 2,
          HEIGHT / 3 - SMALL_STAR_RADIUS / 2);
    }
    private Graphics2D createGraphics2D()
      Graphics2D g2d = null;
      return g2d;
    
    private void drawBigStar(int startX, int startY) {
      Path2D path = new Path2D.Double();
      double x = startX + BIG_STAR_RADIUS;
      double y = startY + BIG_STAR_RADIUS;
      path.moveTo(x, y - BIG_STAR_RADIUS);
      for (int i = 0; i < 4; i++) {
        path.lineTo(x += Math.sin(Math.toRadians(18)) * BIG_STAR_RADIUS,
            y -= Math.cos(Math.toRadians(18)) * BIG_STAR_RADIUS);
        path.lineTo(x -= Math.sin(Math.toRadians(36)) * BIG_STAR_RADIUS,
            y -= Math.cos(Math.toRadians(36)) * BIG_STAR_RADIUS);
      }
      path.closePath();
      g2d.fill(path);
    }
    private void drawSmallStar(int startX, int startY) {
      Path2D path = new Path2D.Double();
      double x = startX + SMALL_STAR_RADIUS;
      double y = startY + SMALL_STAR_RADIUS;
      path.moveTo(x, y - SMALL_STAR_RADIUS);
      for (int i = 0; i < 4; i++) {
        path.lineTo(x += Math.sin(Math.toRadians(18)) * SMALL_STAR_RADIUS,
            y -= Math.cos(Math.toRadians(18)) * SMALL_STAR_RADIUS);
        path.lineTo(x -= Math.sin(Math.toRadians(36)) * SMALL_STAR_RADIUS,
            y -= Math.cos(Math.toRadians(36)) * SMALL_STAR_RADIUS);
      }
      path.closePath();
      g2d.fill(path);
    }
  }
}

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