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--- java:prefuse-scatterplot [2009/08/17 16:38]
Alexander Rind Warning about mixing group names for axis labels
+++ java:prefuse-scatterplot [2009/10/05 15:52]
Alexander Rind some updates
@@ Line 7: / Line 7: @@
 Further, it discusses an axis-based visualization technique, whereas the documentation of prefuse focuses on graph visualization.
 The demo application is inspired by Jeffrey Heer's Congress demo, but achieves its functionality in small incremental steps.
+((Please [[http://ike.donau-uni.ac.at/~rind/ | let me know]], if you spot any errors or misleading information.))
+===== Introduction =====
+Developing with prefuse is for the most part configuration.
+You can achieve both basic and advanced visualizations simply by creating objects and setting their properties.
+However, this makes it very easy produce source code that is hard to understand.
+I recommend to structure your prefuse configuration in four parts:
+  * data setup
+  * renderers
+  * action lists
+  * displays and controls
 ===== Phase 0: Infrastructure =====
@@ Line 114: / Line 127: @@
 {{:java:scatterplot1.java|Source Code}}
+=== Further Information ===
+__Alternative:__ Our visualization class can also be a subclass of either [[http://prefuse.org/doc/api/prefuse/Visualization.html | Visualization]] or [[http://prefuse.org/doc/api/prefuse/Display.html | Display]] instead of referencing them.
+__Note:__ A [[http://prefuse.org/doc/api/prefuse/Visualization.html | Visualization]] objects can handle multiple [[http://prefuse.org/doc/api/prefuse/Display.html | Display]]. However, in some situation prefuse only takes the first display in account -- it is still beta.
 ===== Phase 2: Refinements =====
@@ Line 291: / Line 310: @@
 {{:java:scatterplot4.java|Source Code}}
+=== Further Information ===
+__Warning:__ Panning and Zooming doesn't work as one might expect: it simply performs a geometric transformation of the display.
+__Alternative:__ Using range sliders is an possible alternative to zoom and pan.
+However the underlying interaction metaphor is different and can be harder to understand.
 ===== Phase 5: Refinements on axes =====
@@ Line 347: / Line 373: @@
   * We do not need the empty border defined in phase 2 anymore.
     * Now we or someone else using the [[http://prefuse.org/doc/api/prefuse/Display.html | Display]] can add a border, and items at the edge of the visualization (especially axis labels) stay completely visible.
-__Note:__ If [[http://prefuse.org/doc/api/prefuse/render/AxisRenderer.html | AxisRenderer]] have the ''FAR_LEFT'', ''FAR_RIGHT'', ''FAR_TOP'', or ''FAR_BOTTOM'', the grid lines will fill the bounding box completely and labels will be placed outside :!: the bounding box.
-__Warning:__ Be careful, prefuse will not stop you from designing misleading visualizations, if the bounding boxes of data and axes are not correctly aligned :!:
 First, we define three rectangles for the visualization of the data and both axes.
-__Note:__ The variables are final so that they are accessible from inner classes. Alternatively they could be defined as instance variables.
 <code java>
@@ Line 432: / Line 452: @@
 {{:java:scatterplot6.java|Source Code}}
+=== Further Information ===
+__Note:__ If [[http://prefuse.org/doc/api/prefuse/render/AxisRenderer.html | AxisRenderer]] have the ''FAR_LEFT'', ''FAR_RIGHT'', ''FAR_TOP'', or ''FAR_BOTTOM'', the grid lines will fill the bounding box completely and labels will be placed outside :!: the bounding box.
+__Warning:__ Be careful, prefuse will not stop you from designing misleading visualizations, if the bounding boxes of data and axes are not correctly aligned :!:
+__Note:__ The bounding rectangles are final variables so that they are accessible from inner classes.
+Alternatively they could be defined as instance variables.
+__Alternative:__ Instead of the method ''updateBounds()'', we can write an action that takes care of updating the bounding rectangles.
+Then, this task can be included in the ''update'' action list.

alex @ ieg

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