allow datapoint styling for each series

Introduces datapoint field in GraphViewSeriesStyle. This can be configured, and will be used if LineGraphView.drawDataPoints is false.

src/com/jjoe64/graphview/GraphViewSeries.java

@@ -40,6 +40,8 @@ static public class GraphViewSeriesStyle {
 
 		private final Paint paintBackground;
 		private boolean drawBackground;
+		private boolean drawDataPoints;
+		private float dataPointsRadius = 10f;
 
 		public GraphViewSeriesStyle() {
 			super();
@@ -97,6 +99,32 @@ public int getBackgroundColor() {
 		public void setBackgroundColor(int color) {
 			paintBackground.setColor(color);
 		}
+
+		public float getDataPointsRadius() {
+			return dataPointsRadius;
+		}
+
+		public boolean getDrawDataPoints() {
+			return drawDataPoints;
+		}
+
+		/**
+		 * sets the radius of the circles at the data points.
+		 * @see #setDrawDataPoints(boolean)
+		 * @param dataPointsRadius
+		 */
+		public void setDataPointsRadius(float dataPointsRadius) {
+			this.dataPointsRadius = dataPointsRadius;
+		}
+
+		/**
+		 * You can set the flag to let the GraphView draw circles at the data points
+		 * @see #setDataPointsRadius(float)
+		 * @param drawDataPoints
+		 */
+		public void setDrawDataPoints(boolean drawDataPoints) {
+			this.drawDataPoints = drawDataPoints;
+		}
 	}
 
 	final String description;

src/com/jjoe64/graphview/LineGraphView.java

@@ -93,6 +93,8 @@ public void drawSeries(Canvas canvas, GraphViewDataInterface[] values, float gra
 				if (drawDataPoints) {
 					//fix: last value was not drawn. Draw here now the end values
 					canvas.drawCircle(endX, endY, dataPointsRadius, paint);
+				} else if (style.getDrawDataPoints()) {
+					canvas.drawCircle(endX, endY, style.getDataPointsRadius(), paint);
 				}
 
 				canvas.drawLine(startX, startY, endX, endY, paint);
@@ -103,11 +105,15 @@ public void drawSeries(Canvas canvas, GraphViewDataInterface[] values, float gra
 					}
 					bgPath.lineTo(endX, endY);
 				}
-			} else if (drawDataPoints) {
+			} else if ((drawDataPoints) || (style.getDrawDataPoints())) {
 				//fix: last value not drawn as datapoint. Draw first point here, and then on every step the end values (above)
 				float first_X = (float) x + (horstart + 1);
 				float first_Y = (float) (border - y) + graphheight;
-				canvas.drawCircle(first_X, first_Y, dataPointsRadius, paint);
+				if (drawDataPoints) {
+					canvas.drawCircle(first_X, first_Y, dataPointsRadius, paint);
+				} else if (style.getDrawDataPoints()) {
+					canvas.drawCircle(first_X, first_Y, style.getDataPointsRadius(), paint);
+				}
 			}
 			lastEndY = y;
 			lastEndX = x;