WIP Added new AbstractImageGenerator and ForumBannerGenerator. Refactored bits...

WIP Added new AbstractImageGenerator and ForumBannerGenerator. Refactored bits of export image generators.

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

+package at.alladin.rmbt.statisticServer.export;
+
+import java.awt.Font;
+import java.awt.FontFormatException;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.text.FieldPosition;
+import java.text.Format;
+import java.util.Date;
+import java.util.Locale;
+
+import javax.imageio.ImageIO;
+
+import at.alladin.rmbt.shared.SignificantFormat;
+
+public abstract class AbstractImageGenerator {
+    private static final String TEMPLATES_PATH = "templates/";
+    private static final String FONT_PATH      = "fonts/";
+
+    private static final String FALLBACK_FONT_NAME = "Droid Sans";
+
+    /**
+     * Generates a image for showing the user its speed test result
+     * @param lang: Language of the image, currently either 'de' or 'en'
+     * @param upload: Upload speed in mbps
+     * @param download: Download speed in mbps
+     * @param ping: Ping in ms
+     * @param isp: ISP name
+     * @param typ: Test type (LAN, 3G, 4G, etc.)
+     * @param signal: Signal strength in dbm
+     * @param os: Plattform used for conducting the test (Android, IOS, Applet, Browser)
+     * @return rendered image
+     */
+    public abstract BufferedImage generateImage(
+            String lang,
+            double upload,
+            double download,
+            double ping,
+            String isp,
+            String typ,
+            String signal,
+            String os,
+            Date date
+    ) throws IOException;
+
+    protected BufferedImage loadTemplateImage(String name) throws IOException {
+        return ImageIO.read(super.getClass().getResourceAsStream(TEMPLATES_PATH + name));
+    }
+
+    protected Font loadFont(String name) {
+        try {
+            InputStream fontInputStream = super.getClass().getResourceAsStream(FONT_PATH + name);
+            return Font.createFont(Font.TRUETYPE_FONT, fontInputStream);
+        } catch (FontFormatException | IOException e) {
+            e.printStackTrace();
+            System.out.println("Couldn't load font w/ name: " + name + ". Using fallback font!");
+            return new Font(FALLBACK_FONT_NAME, Font.PLAIN, 1);
+        }
+    }
+
+
+    /**
+     * Formats a number to 2 significant digits
+     * @param number the number
+     * @return the formatted number
+     */
+    protected String formatNumber(double number, String lang) {
+        final Locale locale = new Locale(lang);
+        final Format format = new SignificantFormat(2, locale);
+
+        final StringBuffer buf = format.format(number, new StringBuffer(), new FieldPosition(0));
+        return buf.toString();
+    }
+
+    protected void drawCenteredString(String s, int x, int y, int w, int h, Graphics g) {
+        FontMetrics fm = g.getFontMetrics();
+        x += (w - fm.stringWidth(s)) / 2;
+        y += (fm.getAscent() + (h - (fm.getAscent() + fm.getDescent())) / 2);
+        g.drawString(s, x, y);
+    }
+}

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

+package at.alladin.rmbt.statisticServer.export;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+/**
+ * Created by bcx on 1/30/18.
+ */
+
+public class ForumBannerGenerator extends AbstractImageGenerator {
+    private static final int BANNER_WIDTH  = 560;
+    private static final int BANNER_HEIGHT = 300;
+
+    private static final String TEMPLATE_FORMAT = "forumbanner_%s.png";
+
+    private static final String PRIMARY_FONT    = "Roboto-Light.ttf";
+    private static final String SECONDARY_FONT  = "Roboto-Medium.ttf";
+
+    private Font primaryFont   = null;
+    private Font secondaryFont = null;
+
+    @Override
+    public BufferedImage generateImage(String lang, double upload, double download, double ping, String isp, String typ, String signal, String os, Date time) throws IOException {
+        //Initial setup of final image
+        BufferedImage finalImage = new BufferedImage(BANNER_WIDTH, BANNER_HEIGHT, BufferedImage.TYPE_INT_RGB);
+        Graphics2D finalImageGraphics = finalImage.createGraphics();
+        finalImageGraphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+
+        prepareFonts();
+        renderTemplate(lang, finalImageGraphics);
+
+        renderMainValue(formatNumber(download, lang),  93, 132, finalImageGraphics);
+        renderMainValue(formatNumber(upload,   lang), 280, 132, finalImageGraphics);
+        renderMainValue(formatNumber(ping,     lang), 469, 132, finalImageGraphics);
+
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
+
+        renderAdditionalValue(isp,    151, 246, finalImageGraphics);
+//        renderAdditionalValue(typ,    151, 278, finalImageGraphics);
+        renderAdditionalValue(simpleDateFormat.format(time),    151, 278, finalImageGraphics); //TODO
+        renderAdditionalValue(signal, 432, 246, finalImageGraphics);
+        renderAdditionalValue(os,     432, 278, finalImageGraphics);
+
+        return finalImage;
+    }
+
+    private void prepareFonts() {
+        primaryFont   = loadFont(PRIMARY_FONT);
+        secondaryFont = loadFont(SECONDARY_FONT);
+    }
+
+    private void renderTemplate(String language, Graphics2D graphics) {
+        try {
+            BufferedImage templateImage = loadTemplateImage(String.format(TEMPLATE_FORMAT, language));
+            graphics.drawImage(templateImage, null, 0, 0);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void renderMainValue(String value, int centerX, int centerY, Graphics2D graphics) {
+        graphics.setColor(Color.WHITE);
+
+        Font font = primaryFont.deriveFont(80f);
+        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);
+    }
+
+    private void renderAdditionalValue(String value, int posX, int posY, Graphics2D graphics) {
+        if(value == null || value.isEmpty()) value = "n/a";
+
+        graphics.setColor(Color.WHITE);
+
+        Font font = primaryFont.deriveFont(18f);
+        graphics.setFont(font);
+
+        FontMetrics fontMetrics = graphics.getFontMetrics(font);
+        int height = fontMetrics.getHeight();
+
+        graphics.drawString(value, posX, posY + height/2);
+    }
+}