Add web fill alpha to SpiderWebPlot.

README.md

@@ -64,6 +64,7 @@ History
 - add new panel for background rendering of charts (PR [#233](https://github.com/jfree/jfreechart/pull/233))
 - fix tick label font for `LogAxis` with number format override ([#98](https://github.com/jfree/jfreechart/issues/98));
 - added `valueVisible` flag to `MeterPlot` ([#231](https://github.com/jfree/jfreechart/pull/231));
+- added `get/setWebFillAlpha()` methods to SpiderWebPlot ([#279](https://github.com/jfree/jfreechart/pull/279))
 - add argument checks for annotations ([#223](https://github.com/jfree/jfreechart/issues/223));
 - removed `JFreeChartResources.java` file ([#239](https://github.com/jfree/jfreechart/issues/239))
 

src/main/java/org/jfree/chart/plot/SpiderWebPlot.java

@@ -363,11 +363,22 @@ public void setWebFilled(boolean flag) {
  fireChangeEvent();
  }
 
+ /**
+ * Returns the alpha value for filling a graph (in the range 0.0 to 1.0).
+ *
+ * @return The alpha value for filling a spider plot polygon.
+ *
+ * @see #setWebFillAlpha(float)
+ */
+ public float getWebFillAlpha() {
+ return webFillAlpha;
+ }
 
  /**
- * Method to set the alpha value for the fill of a plot polygon.
+ * Sets the alpha value for the fill of a plot polygon and sends a {@link PlotChangeEvent} to all
+ * registered listeners.
  *
- * @param alpha the new alpha value. If it is outsite [0,1] it will be corrected to fit the range.
+ * @param alpha the new alpha value. If it is outside [0,1] it will be corrected to fit the range.
  * @see #getWebFillAlpha()
  */
  public void setWebFillAlpha(float alpha) {
@@ -380,17 +391,6 @@ public void setWebFillAlpha(float alpha) {
  fireChangeEvent();
  }
 
- /**
- * Method to return the alpha value for filling a graph.
- *
- * @return The alpha value for filling a spider plot polygon.
- *
- * @see #setWebFillAlpha(float)
- */
- public float getWebFillAlpha() {
- return webFillAlpha;
- }
-
  /**
  * Returns the data extract order (by row or by column).
  *
@@ -1497,6 +1497,9 @@ public boolean equals(Object obj) {
  if (this.webFilled != that.webFilled) {
  return false;
  }
+ if (this.webFillAlpha != that.webFillAlpha) {
+ return false;
+ }
  if (this.axisLabelGap != that.axisLabelGap) {
  return false;
  }

src/test/java/org/jfree/chart/plot/SpiderWebPlotTest.java

@@ -189,6 +189,11 @@ public void testEquals() {
  p2.setWebFilled(false);
  assertEquals(p1, p2);
 
+ p1.setWebFillAlpha(0.5f);
+ assertNotEquals(p1, p2);
+ p2.setWebFillAlpha(0.5f);
+ assertEquals(p1, p2);
+
  // axisLabelGap
  p1.setAxisLabelGap(0.11);
  assertNotEquals(p1, p2);