How to Fade an Image in a Swing JPanel?

Fading an Image in Swing

You possess a JPanel-derived class with an image, and you desire to implement an animation that fades the panel/image upon receiving an event. While utilizing a thread and initiating the animation is straightforward, the fading effect requires further clarity.

Solution

Consider employing the Trident library to simplify the fading process. Define a setter (e.g., setOpacity) within your class, allowing you to instruct Trident to interpolate the "opacity" field from 1.0 (fully opaque) to 0.0 (fully transparent) over a specified duration. Examine the Trident documentation for more details.

When drawing the image, apply transparency using an AlphaComposite, which employs the updated "opacity" value as the composite's alpha parameter. Refer to the Sun tutorial's alpha composite example for further guidance.

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