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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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