How to Rotate a Polygon Vertically Around the X-Axis in Java?

Rotating a shape vertically around the x-axis

The provided Java code attempts to rotate a polygon vertically around the x-axis, but the rotation is applied along a horizontal axis. To rotate the polygon vertically, the code needs to apply a rotation transformation to the polygon's Graphics2D object instead of applying it directly to the polygon's coordinates.

To achieve this, the following changes should be made to the code:

1. Create a Graphics2D object from the provided Graphics object:

<code class="java">Graphics2D g2d = (Graphics2D) g;</code>

2. Set the rendering hints to enable anti-aliasing:

<code class="java">g2d.setRenderingHint(
    RenderingHints.KEY_ANTIALIASING,
    RenderingHints.VALUE_ANTIALIAS_ON);</code>

3. Calculate the center point of the polygon:

<code class="java">int centerX = (int) p2x.sum() / p2x.length;
int centerY = (int) p2y.sum() / p2y.length;</code>

4. Translate the Graphics2D object to the center of the polygon:

<code class="java">g2d.translate(centerX - (getWidth() / 2), centerY - (getHeight() / 2));</code>

5. Rotate the Graphics2D object around the x-axis:

<code class="java">g2d.rotate(Math.toRadians(angle), 0, getHeight() / 2);</code>

6. Draw the polygon using the transformed Graphics2D object:

<code class="java">g2d.drawPolygon(p2);</code>

With these changes, the polygon will be rotated vertically around the x-axis.

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