Adjusted font size according so measured values always fit in the image.

RMBTStatisticServer/src/at/alladin/rmbt/statisticServer/export/ForumBannerGenerator.java

@@ -89,9 +89,29 @@ public class ForumBannerGenerator extends AbstractImageGenerator {
         prepareFonts();
         renderTemplate(lang, finalImageGraphics);
 
-        renderMainValue(formatNumber(download, lang),  93, 118, finalImageGraphics);
-        renderMainValue(formatNumber(upload,   lang), 280, 118, finalImageGraphics);
-        renderMainValue(formatNumber(ping,     lang), 469, 118, finalImageGraphics);
+        String downloadValue = formatNumber(download, lang);
+        String uploadValue   = formatNumber(upload,   lang);
+        String pingValue     = formatNumber(ping,     lang);
+
+        int optimalFontSize = getOptimalFontSize(
+                new String[] {downloadValue, uploadValue, pingValue},
+                new int[] {80, 74, 66, 60, 54, 48, 42, 36, 30, 24},
+                167,
+                primaryFont,
+                finalImageGraphics
+                );
+
+        if(optimalFontSize == -1) {
+            //At this point something went horribly wrong. Our values wont fit in the image even on the smallest size.
+            //We should probably give up on life at this point.
+            //TODO - Error handling?
+            System.out.println(ForumBannerGenerator.class + " Couldn't find optimal font size!");
+            optimalFontSize = 1; //Why not?
+        }
+
+        renderMainValue(downloadValue,  93, 118, optimalFontSize, finalImageGraphics);
+        renderMainValue(uploadValue,   280, 118, optimalFontSize, finalImageGraphics);
+        renderMainValue(pingValue,     469, 118, optimalFontSize, finalImageGraphics);
 
         String unknownText = UnknownValueMapping.getUnknownValue(lang);
 
@@ -120,17 +140,47 @@ public class ForumBannerGenerator extends AbstractImageGenerator {
         }
     }
 
-    private void renderMainValue(String value, int centerX, int centerY, Graphics2D graphics) {
+    /**
+     * Gets optimal size from possibleSizes for a font and maximumSize.
+     * @param values - Strings that need to fit in to maximumSize when rendered
+     * @param possibleSizes - Possible sizes to try
+     * @param maximumSize - All Strings from values array need to be smaller than this
+     * @param font - Font to use
+     * @param graphics - Graphics to use
+     * @return Actual optimal font size or -1 on failure.
+     */
+    private int getOptimalFontSize(String[] values, int[] possibleSizes, int maximumSize, Font font, Graphics2D graphics) {
+        for(int currentSize : possibleSizes) {
+            Font currentFont = font.deriveFont((float)(currentSize));
+            FontMetrics fontMetrics = graphics.getFontMetrics(currentFont);
+
+            boolean success = true;
+
+            for(String currentValue : values) {
+                if(fontMetrics.stringWidth(currentValue) > maximumSize) {
+                    success = false;
+                    break;
+                }
+            }
+
+            if(success) return currentSize;
+        }
+
+        //Fallback - return -1
+        return -1;
+    }
+
+    private void renderMainValue(String value, int centerX, int centerY, float fontSize, Graphics2D graphics) {
         graphics.setColor(Color.WHITE);
 
-        Font font = primaryFont.deriveFont(80f);
+        Font font = primaryFont.deriveFont(fontSize); //Need to be float
         graphics.setFont(font);
 
         FontMetrics fontMetrics = graphics.getFontMetrics(font);
         int width  = fontMetrics.stringWidth(value);
         int height = fontMetrics.getHeight();
 
-        graphics.drawString(value, centerX - width/2, centerY + height/2);
+        graphics.drawString(value, centerX - width/2f, centerY + height/2f);
     }
 
     private void renderAdditionalValue(String value, String unknownValue, int posX, int posY, Graphics2D graphics) {
@@ -144,7 +194,7 @@ public class ForumBannerGenerator extends AbstractImageGenerator {
         FontMetrics fontMetrics = graphics.getFontMetrics(font);
         int height = fontMetrics.getHeight();
 
-        graphics.drawString(value, posX, posY + height/2);
+        graphics.drawString(value, posX, posY + height/2f);
     }
 
     private void renderTimeDateValue(String value, String unknownValue, int posX, int posY, Graphics2D graphics) {
@@ -159,6 +209,6 @@ public class ForumBannerGenerator extends AbstractImageGenerator {
         int width  = fontMetrics.stringWidth(value);
         int height = fontMetrics.getHeight();
 
-        graphics.drawString(value, posX - width, posY + height/2);
+        graphics.drawString(value, posX - width, posY + height/2f);
     }
 }