Add multi page support

For each data set in the input data, a new page is created in the rendering process.
The scale factor is shared across all diagramms and  is determined by analyzing
the maximum value of all datasets.
Following this, all axis and their tickmarks are shared across all diagrams.

This ensures comparability between the points on different pages.

src/main/java/de/tudresden/inf/mci/brailleplot/rendering/ScatterPlotRasterizer.java

@@ -42,7 +42,6 @@ public class ScatterPlotRasterizer implements Rasterizer<ScatterPlot> {
         Objects.requireNonNull(canvas);
 
         PointListContainer<PointList> data = scatterPlot.getDataSet();
-        MatrixData<Boolean> mat = canvas.getCurrentPage();
 
         final int cellWidth = canvas.getCellWidth();
         final int cellHeight = canvas.getCellHeight();
@@ -187,11 +186,14 @@ public class ScatterPlotRasterizer implements Rasterizer<ScatterPlot> {
         // Rendering per data set
         // --------------------------------------------------------------------
 
-        // 1. Set diagram title
-        BrailleText diagramTitle = new BrailleText(title, titleArea.scaledBy(cellWidth, cellHeight));
-
-        // 2. Render actual tokens
         for (PointList l : data) {
+
+            MatrixData<Boolean> mat = canvas.getNewPage();
+
+            // 1. Set diagram title
+            BrailleText diagramTitle = new BrailleText(title + titleToDataSetSeparator + l.getName(), titleArea.scaledBy(cellWidth, cellHeight));
+
+            // 2. Render actual tokens
             for (Point2DDouble p : l) {
                 int x = (int) Math.round(Math.abs((p.getX() - xMin) * xRatio));
                 int y = (int) Math.round(Math.abs((p.getY() - yMin) * yRatio));
@@ -204,19 +206,19 @@ public class ScatterPlotRasterizer implements Rasterizer<ScatterPlot> {
                 LOG.debug("Placing token at local: ({},{}), global: ({},{}), rational: ({},{}) for data point: ({},{})", x, y, xGlobal, yGlobal, ((double) x) / ((double) xDots), ((double) y) / ((double) yDots), p.getX(), p.getY());
                 mat.setValue(yGlobal, xGlobal, true);
             }
-        }
 
-        // 5. Render title and axis, or draw layout (for debugging purposes)
-        final boolean printLayout = false;
-        if (!printLayout) {
-            textRasterizer.rasterize(diagramTitle, canvas);
-            axisRasterizer.rasterize(xAxis, canvas);
-            axisRasterizer.rasterize(yAxis, canvas);
-        } else {
-            Rasterizer.rectangle(titleArea, mat, true);
-            Rasterizer.rectangle(xAxisArea, mat, true);
-            Rasterizer.rectangle(yAxisArea, mat, true);
-            Rasterizer.rectangle(printableArea, mat, true);
+            // 5. Render title and axis, or draw layout (for debugging purposes)
+            final boolean printLayout = false;
+            if (!printLayout) {
+                textRasterizer.rasterize(diagramTitle, canvas);
+                axisRasterizer.rasterize(xAxis, canvas);
+                axisRasterizer.rasterize(yAxis, canvas);
+            } else {
+                Rasterizer.rectangle(titleArea, mat, true);
+                Rasterizer.rectangle(xAxisArea, mat, true);
+                Rasterizer.rectangle(yAxisArea, mat, true);
+                Rasterizer.rectangle(printableArea, mat, true);
+            }
         }
 
         // --------------------------------------------------------------------