fixed horizontal and vertical plotting bug

src/com/xeiam/xcharts/AxisTick.java

@@ -149,6 +149,12 @@ public class AxisTick implements IChartPart {
             // System.out.println("b= " + b);
             tickLabels.add(format(b.doubleValue()));
             int tickLabelPosition = (int) (leftMargin + ((b.doubleValue() - axis.getMin()) / (axis.getMax() - axis.getMin()) * tickSpace));
+
+            // a check if all axis data are the exact same values
+            if (Math.abs(axis.getMax() - axis.getMin()) / 5 == 0.0) {
+                tickLabelPosition = (int) (leftMargin + tickSpace / 2.0);
+            }
+
             tickLocations.add(tickLabelPosition);
         }
     }
@@ -162,7 +168,11 @@ public class AxisTick implements IChartPart {
         // e.g. 724.1 --> 7.241 * 10 ** 2
         double mantissa = gridStepHint;
         int exponent = 0;
-        if (mantissa < 1) {
+        if (mantissa == 0) {
+            // mantissa = 0.0;
+            exponent = 1;
+
+        } else if (mantissa < 1) {
             while (mantissa < 1) {
                 mantissa *= 10.0;
                 exponent--;

src/com/xeiam/xcharts/AxisTickLabels.java

@@ -60,7 +60,7 @@ public class AxisTickLabels implements IChartPart {
 
         g.setColor(foreground);
 
-        if (axis.getDirection() == Axis.Direction.Y) {
+        if (axis.getDirection() == Axis.Direction.Y) { // Y-Axis
 
             int xOffset = (int) (axis.getAxisTitle().getBounds().getX() + axis.getAxisTitle().getBounds().getWidth());
             int yOffset = (int) (axis.getPaintZone().getY());

src/com/xeiam/xcharts/PlotContent.java

@@ -75,6 +75,16 @@ public class PlotContent implements IChartPart {
                 int xTransform = (int) (xLeftMargin + ((xData[i] - xMin) / (xMax - xMin) * xTickSpace));
                 int yTransform = (int) (bounds.getHeight() - (yLeftMargin + (yData[i] - yMin) / (yMax - yMin) * yTickSpace));
 
+                // a check if all y data are the exact same values
+                if (Math.abs(xMax - xMin) / 5 == 0.0) {
+                    xTransform = (int) (bounds.getWidth() / 2.0);
+                }
+
+                // a check if all y data are the exact same values
+                if (Math.abs(yMax - yMin) / 5 == 0.0) {
+                    yTransform = (int) (bounds.getHeight() / 2.0);
+                }
+
                 int xOffset = (int) (bounds.getX() + xTransform - 1);
                 int yOffset = (int) (bounds.getY() + yTransform);
 

src/com/xeiam/xcharts/example/SwingChart.java

@@ -32,18 +32,18 @@ public class SwingChart {
 
     private static void createAndShowGUI() {
 
-        // generates sine data
-        int size = 100;
-        double[] xData1 = new double[size + 1];
-        double[] yData1 = new double[size + 1];
-        for (int i = 0; i <= size; i++) {
-            double radians = (Math.PI / (size / 2) * i);
-            xData1[i] = i - size / 2;
-            yData1[i] = size * Math.sin(radians);
-        }
+        // // generates sine data
+        // int size = 100;
+        // double[] xData1 = new double[size + 1];
+        // double[] yData1 = new double[size + 1];
+        // for (int i = 0; i <= size; i++) {
+        // double radians = (Math.PI / (size / 2) * i);
+        // xData1[i] = i - size / 2;
+        // yData1[i] = size * Math.sin(radians);
+        // }
 
         // generates linear data
-        int size2 = 40;
+        int size2 = 100;
         double[] xData2 = new double[size2 + 1];
         double[] yData2 = new double[size2 + 1];
         for (int i = 0; i <= size2; i++) {
@@ -68,7 +68,7 @@ public class SwingChart {
         // chart.setAxisTitlesVisible(false);
 
         // Series 1
-        Series series1 = chart.addSeries("y=sin(x)", xData1, yData1);
+        // Series series1 = chart.addSeries("y=sin(x)", xData1, yData1);
         // series1.setLineColor(SeriesColor.PURPLE);
         // series1.setLineStyle(SeriesLineStyle.NONE);
         // series1.setMarkerColor(SeriesColor.GREEN);

src/com/xeiam/xcharts/example/SwingChart3.java

+/**
+ * Copyright 2011 Xeiam LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.xeiam.xcharts.example;
+
+import java.awt.BorderLayout;
+
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+import com.xeiam.xcharts.Chart;
+import com.xeiam.xcharts.JChartPanel;
+import com.xeiam.xcharts.series.Series;
+
+/**
+ * Demonstrated/Tests plotting horizontal and vertical lines
+ * 
+ * @author timmolter
+ */
+public class SwingChart3 {
+
+    private static void createAndShowGUI() {
+
+        // generates linear data
+        double[] xData1 = new double[] { 0.0, 1.0, 2.0 };
+        double[] yData1 = new double[] { 0.0, 0.0, 0.0 };
+        double[] xData2 = new double[] { 0.0, 0.0, 0.0 };
+        double[] yData2 = new double[] { 0.0, 1.0, 2.0 };
+
+        // Create and set up the window.
+        JFrame frame = new JFrame("XChart");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setUndecorated(true);
+
+        // Create Chart
+        Chart chart = new Chart(800, 600);
+
+        // Customize Chart
+        chart.setChartTitle("Sample Chart");
+        chart.setXAxisTitle("X");
+        chart.setYAxisTitle("Y");
+        // chart.setChartTitleVisible(false);
+        // chart.setChartLegendVisible(false);
+        // chart.setAxisTitlesVisible(false);
+
+        // Series
+        Series series1 = chart.addSeries("y=0", xData1, yData1);
+        Series series2 = chart.addSeries("x=0", xData2, yData2);
+
+        // Swing
+        JPanel chartPanel = new JChartPanel(chart);
+
+        // add the panel to the content pane
+        frame.getContentPane().add(chartPanel, BorderLayout.CENTER);
+
+        // Display the window
+        frame.pack();
+        frame.setLocationRelativeTo(null); // centers on screen
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) {
+
+        // Schedule a job for the event-dispatching thread:
+        // creating and showing this application's GUI.
+        javax.swing.SwingUtilities.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                createAndShowGUI();
+            }
+        });
+    }
+}