Indicate non-embossed dots

This is usefull when working on a sparse, non-uniform grid.

src/main/java/de/tudresden/inf/mci/brailleplot/svgexporter/BoolMatrixDataSvgExporter.java

@@ -4,15 +4,20 @@ import de.tudresden.inf.mci.brailleplot.printabledata.MatrixData;
 import de.tudresden.inf.mci.brailleplot.layout.RasterCanvas;
 import org.jfree.graphics2d.svg.SVGGraphics2D;
 
+import java.awt.Color;
 import java.util.List;
 
 /**
  * SVG exporter class that supports {@link RasterCanvas} as input.
  * @author Georg Graßnick
- * @version 2019.08.20
+ * @version 2019.08.30
  */
 public class BoolMatrixDataSvgExporter extends AbstractSvgExporter<RasterCanvas, MatrixData<Boolean>> {
 
+    final static private int EMPTY_DOT_COLOR_GRAY = 225;
+    final static private Color EMPTY_DOT_COLOR = new Color(EMPTY_DOT_COLOR_GRAY, EMPTY_DOT_COLOR_GRAY, EMPTY_DOT_COLOR_GRAY);
+    final static private Color FULL_DOT_COLOR = Color.BLACK;
+
 
     public BoolMatrixDataSvgExporter(final RasterCanvas rasterCanvas) {
         super(rasterCanvas);
@@ -28,12 +33,16 @@ public class BoolMatrixDataSvgExporter extends AbstractSvgExporter<RasterCanvas,
 
         for (int y = 0; y < mat.getRowCount(); y++) {
             for (int x = 0; x < mat.getColumnCount(); x++) {
+                int xPos = (int) Math.round((xPositions.get(x) + mCanvas.getFullConstraintLeft() - (double) dotDiameter / 2) * SCALE_FACTOR);
+                int yPos = (int) Math.round((yPositions.get(y) + mCanvas.getFullConstraintTop() - (double) dotDiameter / 2) * SCALE_FACTOR);
                 if (mat.getValue(y, x)) {
-                    int xPos = (int) Math.round((xPositions.get(x) + mCanvas.getFullConstraintLeft() - dotDiameter / 2) * SCALE_FACTOR);
-                    int yPos = (int) Math.round((yPositions.get(y) + mCanvas.getFullConstraintTop() - dotDiameter / 2) * SCALE_FACTOR);
-                    svg.drawOval(xPos, yPos, dotDiameter, dotDiameter);
+                    svg.setColor(FULL_DOT_COLOR);
                     mLogger.trace("Drew dot at position ({},{})", xPos, yPos);
+                } else {
+                    svg.setColor(EMPTY_DOT_COLOR);
                 }
+
+                svg.drawOval(xPos, yPos, dotDiameter, dotDiameter);
             }
         }
     }