rotating coordinate plane for data and text in Java

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One approach is shown in SineTest. In outline,

  1. Save the graphics context’s transform.

    Graphics2D g2d = (Graphics2D) g;
AffineTransform at = g2d.getTransform();

  2. Translate the origin to the center.

    g2d.translate(w / 2, h / 2);

  3. Invert the y-axis.

    g2d.scale(1, -1);

  4. Render using cartesian coordinates.

  5. Restore the transform for conventional rendering.

    g2d.setTransform(at);

enter image description here

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