1 files changed, 124 insertions, 0 deletions
diff --git a/addons/batikvis/src/main/java/de/lmu/ifi/dbs/elki/visualization/visualizers/scatterplot/AbstractScatterplotVisualization.java b/addons/batikvis/src/main/java/de/lmu/ifi/dbs/elki/visualization/visualizers/scatterplot/AbstractScatterplotVisualization.java
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index 00000000..13225426
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+++ b/addons/batikvis/src/main/java/de/lmu/ifi/dbs/elki/visualization/visualizers/scatterplot/AbstractScatterplotVisualization.java
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+package de.lmu.ifi.dbs.elki.visualization.visualizers.scatterplot;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2015
+ Ludwig-Maximilians-Universität München
+ Lehr- und Forschungseinheit für Datenbanksysteme
+ ELKI Development Team
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import org.apache.batik.util.SVGConstants;
+import org.w3c.dom.Element;
+
+import de.lmu.ifi.dbs.elki.data.NumberVector;
+import de.lmu.ifi.dbs.elki.database.relation.Relation;
+import de.lmu.ifi.dbs.elki.result.ResultUtil;
+import de.lmu.ifi.dbs.elki.result.SamplingResult;
+import de.lmu.ifi.dbs.elki.visualization.VisualizationItem;
+import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
+import de.lmu.ifi.dbs.elki.visualization.gui.VisualizationPlot;
+import de.lmu.ifi.dbs.elki.visualization.projections.CanvasSize;
+import de.lmu.ifi.dbs.elki.visualization.projections.Projection;
+import de.lmu.ifi.dbs.elki.visualization.projections.Projection2D;
+import de.lmu.ifi.dbs.elki.visualization.style.StyleLibrary;
+import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
+import de.lmu.ifi.dbs.elki.visualization.svg.SVGUtil;
+import de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisualization;
+
+/**
+ * Default class to handle 2D projected visualizations.
+ *
+ * @author Erich Schubert
+ *
+ * @apiviz.landmark
+ * @apiviz.has Projection2D
+ */
+public abstract class AbstractScatterplotVisualization extends AbstractVisualization {
+  /**
+   * The current projection
+   */
+  final protected Projection2D proj;
+
+  /**
+   * The representation we visualize
+   */
+  final protected Relation<? extends NumberVector> rel;
+
+  /**
+   * The DBID sample
+   */
+  final protected SamplingResult sample;
+
+  /**
+   * Constructor.
+   *
+   * @param task Visualization task
+   * @param plot Plot to draw to
+   * @param width Embedding width
+   * @param height Embedding height
+   * @param proj Projection
+   */
+  public AbstractScatterplotVisualization(VisualizationTask task, VisualizationPlot plot, double width, double height, Projection proj) {
+    super(task, plot, width, height);
+    this.proj = (Projection2D) proj;
+    this.rel = task.getRelation();
+    this.sample = task.updateOnAny(VisualizationTask.ON_SAMPLE) ? ResultUtil.getSamplingResult(rel) : null;
+  }
+
+  /**
+   * Setup our canvas.
+   *
+   * @return Canvas
+   */
+  protected Element setupCanvas() {
+    final double margin = context.getStyleLibrary().getSize(StyleLibrary.MARGIN);
+    this.layer = setupCanvas(svgp, this.proj, margin, getWidth(), getHeight());
+    return layer;
+  }
+
+  /**
+   * Utility function to setup a canvas element for the visualization.
+   *
+   * @param svgp Plot element
+   * @param proj Projection to use
+   * @param margin Margin to use
+   * @param width Width
+   * @param height Height
+   * @return wrapper element with appropriate view box.
+   */
+  public static Element setupCanvas(SVGPlot svgp, Projection2D proj, double margin, double width, double height) {
+    final CanvasSize canvas = proj.estimateViewport();
+    final double sizex = canvas.getDiffX();
+    final double sizey = canvas.getDiffY();
+    String transform = SVGUtil.makeMarginTransform(width, height, sizex, sizey, margin) + " translate(" + SVGUtil.fmt(sizex * .5) + " " + SVGUtil.fmt(sizey * .5) + ")";
+
+    final Element layer = SVGUtil.svgElement(svgp.getDocument(), SVGConstants.SVG_G_TAG);
+    SVGUtil.setAtt(layer, SVGConstants.SVG_TRANSFORM_ATTRIBUTE, transform);
+    return layer;
+  }
+
+  @Override
+  public void visualizationChanged(VisualizationItem item) {
+    super.visualizationChanged(item);
+    if(item == proj) {
+      svgp.requestRedraw(this.task, this);
+      return;
+    }
+  }
+}
+\ No newline at end of file