Method renderLegend

src/main/java/mudmap2/backend/legend/Legend.java:222–302

Renders the prepared entries @param g graphic to draw on

()

     * @param g graphic to draw on
     */
    private BufferedImage renderLegend() throws RenderException {
        /// TODO: javadoc
        final int numEntries        = legendEntries.size();

        // get sizing (maximum width -> number of columns, maximum heigth -> graphics size)
        int maxElementWidth = 0;
        int maxElementHeight = 0;

        BufferedImage tempImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
        Graphics tempGraphics = tempImage.getGraphics();

        for(LegendEntry entry: legendEntries){
            maxElementWidth    = Math.max(maxElementWidth, entry.getWidth(tempGraphics));
            maxElementHeight   = Math.max(maxElementHeight, entry.getHeight(tempGraphics));
        }

        int numColumns;
        int numRows;
        int targetWidth;
        int targetHeight;

        if(orientation == Orientation.HORIZONTAL){
            numColumns = Math.floorDiv(size - 2*ELEMENT_MARGIN_OUTSIDE,
                    maxElementWidth + ELEMENT_MARGIN_BETWEEN_HOR);
            if(numColumns < 1) throw new RenderException(ExceptionReason.IMAGE_TOO_SMALL);
            numRows = (int) Math.ceil((double) numEntries / (double) numColumns);

            targetWidth = size;
            targetHeight = numRows * (maxElementHeight + ELEMENT_MARGIN_BETWEEN_VERT)
                    + 2*ELEMENT_MARGIN_OUTSIDE;
        } else { // Orientation.VERTICAL
            numRows = Math.floorDiv(size - 2*ELEMENT_MARGIN_OUTSIDE,
                    maxElementHeight + ELEMENT_MARGIN_BETWEEN_VERT);
            if(numRows < 1) throw new RenderException(ExceptionReason.IMAGE_TOO_SMALL);
            numColumns = (int) Math.ceil((double) numEntries / (double) numRows);

            targetWidth = numColumns * (maxElementWidth + ELEMENT_MARGIN_BETWEEN_HOR)
                    + 2*ELEMENT_MARGIN_OUTSIDE;
            targetHeight = size;
        }


        // create temporary graphics
        BufferedImage image = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics graphics = image.getGraphics();
        ((Graphics2D) graphics).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        // draw background
        ((Graphics2D) graphics).setBackground(backgroundColor);
        graphics.clearRect(0, 0, targetWidth, targetHeight);

        // render entries
        ListIterator<LegendEntry> iterator = legendEntries.listIterator();
        int curColumn = 0;
        int curY = ELEMENT_MARGIN_OUTSIDE;
        int curX = ELEMENT_MARGIN_OUTSIDE;