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PODrawing Transparent Images In Java Graphics2D
 

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    <p>I want to draw a PARTIALLY transparent image on top of another (Making shadows over things). I am currently using java's Graphics2D class to render, I've been told to set the composite to AlphaComposite, but that only sets it completely transparent.</p> <p>Can I do this with my current setup? What do I have to do to fix this?</p> <p>This is the code I was told that would make it partially transparent:</p> <pre><code> AlphaComposite ac = java.awt.AlphaComposite.getInstance(AlphaComposite.CLEAR, 0.5F); g.setComposite(ac); </code></pre> <p>(I am using png images by the way)</p> <p>Heres your sscce (these are all in different classes but i put them together for simplicity) (I use an image called "Test" in the local folder "Images", you can use whatever for this as long as it is a png Image named the same</p> <pre><code>import java.awt.AlphaComposite; import java.awt.Color; import java.awt.DisplayMode; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Window; import javax.swing.ImageIcon; import com.blazingkin.atrox.ScreenManager; public class AtroxAdventrum{ public static void main(String[] args) { new AtroxAdventrum().run(); } private static DisplayMode modes[] = { //new DisplayMode(1080,720,32,0), //new DisplayMode(1080,720,24,0), //new DisplayMode(1080,720,16,0), //new DisplayMode(1440,900,32,0), //new DisplayMode(1440,900,24,0), //new DisplayMode(1440,900,16,0), }; private boolean running = true; public ScreenManager s; public void stop(){ running = false; } public void run(){ try{ init(); gameLoop(); }finally{ s.restoreScreen(); } } public void init(){ s = new ScreenManager(); DisplayMode dm = s.findFirstCompatibleMode(modes); s.setFullScreen(dm); Window w = s.getFullScreenWindow(); w.setFont(new Font("Arial", Font.PLAIN, 20)); w.setBackground(Color.black); w.setForeground(Color.white); } public void gameLoop(){ long startTime = System.currentTimeMillis(); long cumTime = startTime; while (running) { long timePassed = System.currentTimeMillis() - cumTime; cumTime += timePassed; if (limitfps){ try{ Thread.sleep(15); }catch(Exception e){} } update(timePassed); Graphics2D g = s.getGraphics(); draw(g); g.dispose(); s.update(); } } public void update(long timePassed){ } public boolean limitfps = false; public void draw(Graphics2D g){ g.clearRect(0, 0, s.getWidth(), s.getHeight()); AlphaComposite ac = java.awt.AlphaComposite.getInstance(AlphaComposite.CLEAR,0.5F); g.setComposite(ac); g.drawImage(new ImageIcon("Images/Test.png").getImage(), 30, 30, 30, 30, null); } } </code></pre> <p>If you run this you will have to alt + tab out and end the process (as it doesnt have anything in this portion of code to do such)</p>
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    1. COYou state `"I've been told to set the composite to AlphaComposite, but that only sets it completely transparent...."` Nonsense. The alpha composite if set correctly can cause a full gradation of transparency. So you must be doing something wrong, but we can't tell what without code. Show us the code, preferably an [sscce](http://sscce.org).
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    2. COThere I posted some code that i believe should be setting anything i render with the draw method partially transparent
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    3. COI can't test your code since I can't run it. If you don't get an answer soon, please consider creating and posting an [sscce](http://sscce.org) (read the link to see what this entails).
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