如何在Java How中显示旋转的多边形How/ ShapeRenderer

在Java中显示旋转的多边形可以使用ShapeRenderer类来实现。ShapeRenderer是LibGDX游戏开发框架中的一个工具类，用于绘制2D形状。

要在Java中显示旋转的多边形，可以按照以下步骤进行操作：

导入必要的库和类：

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.math.MathUtils;

创建一个ApplicationAdapter类并继承它：

public class MyGame extends ApplicationAdapter {
    private OrthographicCamera camera;
    private ShapeRenderer shapeRenderer;

    @Override
    public void create() {
        camera = new OrthographicCamera();
        camera.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        shapeRenderer = new ShapeRenderer();
    }

    @Override
    public void render() {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        camera.update();
        shapeRenderer.setProjectionMatrix(camera.combined);

        shapeRenderer.begin(ShapeRenderer.ShapeType.Line);
        shapeRenderer.setColor(1, 1, 1, 1);

        float centerX = Gdx.graphics.getWidth() / 2;
        float centerY = Gdx.graphics.getHeight() / 2;
        float radius = 100;
        int sides = 6;
        float angle = MathUtils.PI2 / sides;

        for (int i = 0; i < sides; i++) {
            float x1 = centerX + MathUtils.cos(angle * i) * radius;
            float y1 = centerY + MathUtils.sin(angle * i) * radius;
            float x2 = centerX + MathUtils.cos(angle * (i + 1)) * radius;
            float y2 = centerY + MathUtils.sin(angle * (i + 1)) * radius;

            shapeRenderer.line(x1, y1, x2, y2);
        }

        shapeRenderer.end();
    }

    @Override
    public void dispose() {
        shapeRenderer.dispose();
    }
}