diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/AxisTick.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/AxisTick.java
index 8e83c3c5b2409d4d7936c024012a172301580b39..2fdc51574562f33094f15581bd60cacd277f0258 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/AxisTick.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/AxisTick.java
@@ -21,9 +21,10 @@ import java.util.List;
import com.xeiam.xchart.Chart;
import com.xeiam.xchart.internal.chartpart.Axis.AxisType;
-import com.xeiam.xchart.internal.chartpart.gridstep.DateGridStep;
-import com.xeiam.xchart.internal.chartpart.gridstep.DecimalGridStep;
-import com.xeiam.xchart.internal.chartpart.gridstep.GridStep;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.AxisTickCalculator;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DateAxisTickCalculator;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DecimalAxisTickCalculator;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.LogarithmicAxisTickCalculator;
/**
* An axis tick
@@ -45,7 +46,7 @@ public class AxisTick implements ChartPart {
/** the visibility state of axistick */
private boolean isVisible = true; // default to true
- GridStep gridStep = null;
+ AxisTickCalculator gridStep = null;
/**
* Constructor
@@ -81,22 +82,19 @@ public class AxisTick implements ChartPart {
// System.out.println("workingspace= " + workingSpace);
}
- // ////////////////////////
-
if (axis.getAxisType() == AxisType.Number) {
- gridStep = new DecimalGridStep(axis.getDirection(), workingSpace, axis.getMin(), axis.getMax(), getChart().getStyleManager());
+ gridStep = new DecimalAxisTickCalculator(axis.getDirection(), workingSpace, axis.getMin(), axis.getMax(), getChart().getStyleManager());
} else if (axis.getAxisType() == AxisType.Date) {
- gridStep = new DateGridStep(axis.getDirection(), workingSpace, axis.getMin(), axis.getMax(), getChart().getStyleManager());
+ gridStep = new DateAxisTickCalculator(axis.getDirection(), workingSpace, axis.getMin(), axis.getMax(), getChart().getStyleManager());
} else if (axis.getAxisType() == AxisType.Logarithmic) {
+ gridStep = new LogarithmicAxisTickCalculator(axis.getDirection(), workingSpace, axis.getMin(), axis.getMax(), getChart().getStyleManager());
}
- // /////////////////////////
-
if (isVisible) {
axisTickLabels.paint(g);
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/GridStep.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/AxisTickCalculator.java
similarity index 92%
rename from xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/GridStep.java
rename to xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/AxisTickCalculator.java
index f10ec2bfdf1da6c8a3044a85eb9a5314553d57cd..8a9242302875a88de7c844313432e22b4ebca795 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/GridStep.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/AxisTickCalculator.java
@@ -19,14 +19,14 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-package com.xeiam.xchart.internal.chartpart.gridstep;
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
import java.util.List;
/**
* @author timmolter
*/
-public interface GridStep {
+public interface AxisTickCalculator {
public List<Integer> getTickLocations();
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateGridStep.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateAxisTickCalculator.java
similarity index 93%
rename from xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateGridStep.java
rename to xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateAxisTickCalculator.java
index d27af6ebff922b3d851dbe38399e19ef00853024..fd93c28c67dbf48058e0f0a8098522af22ffbe18 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateGridStep.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateAxisTickCalculator.java
@@ -19,7 +19,7 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-package com.xeiam.xchart.internal.chartpart.gridstep;
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
import java.math.BigDecimal;
import java.util.LinkedList;
@@ -30,9 +30,11 @@ import com.xeiam.xchart.internal.chartpart.AxisPair;
import com.xeiam.xchart.style.StyleManager;
/**
+ * This class encapsulates the logic to generate the axis tick mark and axis tick label data for rendering the axis ticks for date axes
+ *
* @author timmolter
*/
-public class DateGridStep implements GridStep {
+public class DateAxisTickCalculator implements AxisTickCalculator {
/** the default tick mark step hint for x axis */
private static final int DEFAULT_TICK_MARK_STEP_HINT_X = 74;
@@ -63,8 +65,9 @@ public class DateGridStep implements GridStep {
* @param workingSpace
* @param minValue
* @param maxValue
+ * @param styleManager
*/
- public DateGridStep(Direction axisDirection, int workingSpace, BigDecimal minValue, BigDecimal maxValue, StyleManager styleManager) {
+ public DateAxisTickCalculator(Direction axisDirection, int workingSpace, BigDecimal minValue, BigDecimal maxValue, StyleManager styleManager) {
this.axisDirection = axisDirection;
this.workingSpace = workingSpace;
@@ -72,10 +75,10 @@ public class DateGridStep implements GridStep {
this.maxValue = maxValue;
this.styleManager = styleManager;
- go();
+ calculate();
}
- private void go() {
+ private void calculate() {
// a check if all axis data are the exact same values
if (minValue == maxValue) {
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateFormatter.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateFormatter.java
similarity index 98%
rename from xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateFormatter.java
rename to xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateFormatter.java
index 21fae0c6bce48bd3545f852930c9868721577c4e..448002e01469b8d3b726735710a90f35a09cb78d 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DateFormatter.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DateFormatter.java
@@ -19,7 +19,7 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-package com.xeiam.xchart.internal.chartpart.gridstep;
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalGridStep.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalAxisTickCalculator.java
similarity index 94%
rename from xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalGridStep.java
rename to xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalAxisTickCalculator.java
index b1426418da6de94d78e43bc732a97b5adcbb2690..f22f06edc4a7852920a95118dfaca5bb16c00a4d 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalGridStep.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalAxisTickCalculator.java
@@ -19,7 +19,7 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-package com.xeiam.xchart.internal.chartpart.gridstep;
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
import java.math.BigDecimal;
import java.util.LinkedList;
@@ -30,11 +30,11 @@ import com.xeiam.xchart.internal.chartpart.AxisPair;
import com.xeiam.xchart.style.StyleManager;
/**
- * This class encapsulates the logic to generate the axis tick mark and axis tick label data for rendering the axis ticks for decimla axes
+ * This class encapsulates the logic to generate the axis tick mark and axis tick label data for rendering the axis ticks for decimal axes
*
* @author timmolter
*/
-public class DecimalGridStep implements GridStep {
+public class DecimalAxisTickCalculator implements AxisTickCalculator {
/** the default tick mark step hint for x axis */
private static final int DEFAULT_TICK_MARK_STEP_HINT_X = 74;
@@ -65,8 +65,9 @@ public class DecimalGridStep implements GridStep {
* @param workingSpace
* @param minValue
* @param maxValue
+ * @param styleManager
*/
- public DecimalGridStep(Direction axisDirection, int workingSpace, BigDecimal minValue, BigDecimal maxValue, StyleManager styleManager) {
+ public DecimalAxisTickCalculator(Direction axisDirection, int workingSpace, BigDecimal minValue, BigDecimal maxValue, StyleManager styleManager) {
this.axisDirection = axisDirection;
this.workingSpace = workingSpace;
@@ -74,10 +75,10 @@ public class DecimalGridStep implements GridStep {
this.maxValue = maxValue;
this.styleManager = styleManager;
- go();
+ calculate();
}
- private void go() {
+ private void calculate() {
// a check if all axis data are the exact same values
if (minValue == maxValue) {
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalFormatter.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalFormatter.java
similarity index 98%
rename from xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalFormatter.java
rename to xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalFormatter.java
index abf2d54d1cf25f0051f8605ea7618c8166841493..27fb6d48634794c3d3d4533ba9d14c175c6a79fc 100644
--- a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/gridstep/DecimalFormatter.java
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/DecimalFormatter.java
@@ -19,7 +19,7 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
-package com.xeiam.xchart.internal.chartpart.gridstep;
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
import java.math.BigDecimal;
import java.text.DecimalFormat;
diff --git a/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/LogarithmicAxisTickCalculator.java b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/LogarithmicAxisTickCalculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..7cd44ab005b710922e0fdf7687e1b86e554cfe25
--- /dev/null
+++ b/xchart/src/main/java/com/xeiam/xchart/internal/chartpart/axistickcalculator/LogarithmicAxisTickCalculator.java
@@ -0,0 +1,208 @@
+/**
+ * Copyright (C) 2013 Xeiam LLC http://xeiam.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.xeiam.xchart.internal.chartpart.axistickcalculator;
+
+import java.math.BigDecimal;
+import java.util.LinkedList;
+import java.util.List;
+
+import com.xeiam.xchart.internal.chartpart.Axis.Direction;
+import com.xeiam.xchart.internal.chartpart.AxisPair;
+import com.xeiam.xchart.style.StyleManager;
+
+/**
+ * This class encapsulates the logic to generate the axis tick mark and axis tick label data for rendering the axis ticks for decimal axes
+ *
+ * @author timmolter
+ */
+public class LogarithmicAxisTickCalculator implements AxisTickCalculator {
+
+ /** the default tick mark step hint for x axis */
+ private static final int DEFAULT_TICK_MARK_STEP_HINT_X = 74;
+
+ /** the default tick mark step hint for y axis */
+ private static final int DEFAULT_TICK_MARK_STEP_HINT_Y = 44;
+
+ /** the List of tick label position in pixels */
+ private List<Integer> tickLocations = new LinkedList<Integer>();;
+
+ /** the List of tick label values */
+ private List<String> tickLabels = new LinkedList<String>();
+
+ private final Direction axisDirection;
+
+ private final int workingSpace;
+
+ private final BigDecimal minValue;
+
+ private final BigDecimal maxValue;
+
+ private final StyleManager styleManager;
+
+ /**
+ * Constructor
+ *
+ * @param axisDirection
+ * @param workingSpace
+ * @param minValue
+ * @param maxValue
+ * @param styleManager
+ */
+ public LogarithmicAxisTickCalculator(Direction axisDirection, int workingSpace, BigDecimal minValue, BigDecimal maxValue, StyleManager styleManager) {
+
+ this.axisDirection = axisDirection;
+ this.workingSpace = workingSpace;
+ this.minValue = minValue;
+ this.maxValue = maxValue;
+ this.styleManager = styleManager;
+
+ calculate();
+ }
+
+ private void calculate() {
+
+ // a check if all axis data are the exact same values
+ if (minValue == maxValue) {
+ tickLabels.add(styleManager.getDecimalFormatter().formatNumber(maxValue));
+ tickLocations.add((int) (workingSpace / 2.0));
+ return;
+ }
+
+ // tick space - a percentage of the working space available for ticks, i.e. 95%
+ int tickSpace = AxisPair.getTickSpace(workingSpace); // in plot space
+ System.out.println("tickSpace= " + tickSpace);
+
+ // where the tick should begin in the working space in pixels
+ int margin = AxisPair.getTickStartOffset(workingSpace, tickSpace); // in plot space BigDecimal gridStep = getGridStepForDecimal(tickSpace);
+
+ BigDecimal gridStep = getGridStepForDecimal(tickSpace);
+
+ BigDecimal firstPosition = getFirstPosition(minValue, gridStep);
+
+ // generate all tickLabels and tickLocations from the first to last position
+ for (BigDecimal tickPosition = firstPosition; tickPosition.compareTo(maxValue) <= 0; tickPosition = tickPosition.add(gridStep)) {
+
+ tickLabels.add(styleManager.getDecimalFormatter().formatNumber(tickPosition));
+ // here we convert tickPosition finally to plot space, i.e. pixels
+ int tickLabelPosition = (int) (margin + ((tickPosition.subtract(minValue)).doubleValue() / (maxValue.subtract(minValue)).doubleValue() * tickSpace));
+ tickLocations.add(tickLabelPosition);
+ }
+ }
+
+ /**
+ * Determine the grid step for the data set given the space in pixels allocated for the axis
+ *
+ * @param tickSpace in plot space
+ * @return
+ */
+ private BigDecimal getGridStepForDecimal(int tickSpace) {
+
+ // the span of the data
+ double span = Math.abs(maxValue.subtract(minValue).doubleValue()); // in data space
+
+ int tickMarkSpaceHint = (axisDirection == Direction.X ? DEFAULT_TICK_MARK_STEP_HINT_X : DEFAULT_TICK_MARK_STEP_HINT_Y);
+
+ // for very short plots, squeeze some more ticks in than normal
+ if (axisDirection == Direction.Y && tickSpace < 160) {
+ tickMarkSpaceHint = 25;
+ }
+
+ double gridStepHint = span / tickSpace * tickMarkSpaceHint;
+
+ // gridStepHint --> significand * 10 ** exponent
+ // e.g. 724.1 --> 7.241 * 10 ** 2
+ double significand = gridStepHint;
+ int exponent = 0;
+ if (significand == 0) {
+ exponent = 1;
+ } else if (significand < 1) {
+ while (significand < 1) {
+ significand *= 10.0;
+ exponent--;
+ }
+ } else {
+ while (significand >= 10) {
+ significand /= 10.0;
+ exponent++;
+ }
+ }
+
+ // calculate the grid step with hint.
+ BigDecimal gridStep;
+ if (significand > 7.5) {
+ // gridStep = 10.0 * 10 ** exponent
+ gridStep = BigDecimal.TEN.multiply(pow(10, exponent));
+ } else if (significand > 3.5) {
+ // gridStep = 5.0 * 10 ** exponent
+ gridStep = new BigDecimal(new Double(5).toString()).multiply(pow(10, exponent));
+ } else if (significand > 1.5) {
+ // gridStep = 2.0 * 10 ** exponent
+ gridStep = new BigDecimal(new Double(2).toString()).multiply(pow(10, exponent));
+ } else {
+ // gridStep = 1.0 * 10 ** exponent
+ gridStep = pow(10, exponent);
+ }
+ return gridStep;
+ }
+
+ /**
+ * Calculates the value of the first argument raised to the power of the second argument.
+ *
+ * @param base the base
+ * @param exponent the exponent
+ * @return the value <tt>a<sup>b</sup></tt> in <tt>BigDecimal</tt>
+ */
+ private BigDecimal pow(double base, int exponent) {
+
+ BigDecimal value;
+ if (exponent > 0) {
+ value = new BigDecimal(new Double(base).toString()).pow(exponent);
+ } else {
+ value = BigDecimal.ONE.divide(new BigDecimal(new Double(base).toString()).pow(-exponent));
+ }
+ return value;
+ }
+
+ private BigDecimal getFirstPosition(final BigDecimal min, BigDecimal gridStep) {
+
+ BigDecimal firstPosition;
+ if (min.remainder(gridStep).doubleValue() <= 0.0) {
+ firstPosition = min.subtract(min.remainder(gridStep));
+ } else {
+ firstPosition = min.subtract(min.remainder(gridStep)).add(gridStep);
+ }
+ return firstPosition;
+ }
+
+ @Override
+ public List<Integer> getTickLocations() {
+
+ return tickLocations;
+ }
+
+ @Override
+ public List<String> getTickLabels() {
+
+ return tickLabels;
+ }
+
+}
diff --git a/xchart/src/main/java/com/xeiam/xchart/style/StyleManager.java b/xchart/src/main/java/com/xeiam/xchart/style/StyleManager.java
index 32b9701b6d7652037cd9513b4d57763002c958d7..37ad7c292ce7199109e29dbc863ffcff547d1b41 100644
--- a/xchart/src/main/java/com/xeiam/xchart/style/StyleManager.java
+++ b/xchart/src/main/java/com/xeiam/xchart/style/StyleManager.java
@@ -25,8 +25,8 @@ import java.awt.Color;
import java.awt.Font;
import java.awt.Stroke;
-import com.xeiam.xchart.internal.chartpart.gridstep.DateFormatter;
-import com.xeiam.xchart.internal.chartpart.gridstep.DecimalFormatter;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DateFormatter;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DecimalFormatter;
import com.xeiam.xchart.style.theme.Theme;
import com.xeiam.xchart.style.theme.XChartTheme;
diff --git a/xchart/src/test/java/com/xeiam/xchart/unit/ValueFormatterTest.java b/xchart/src/test/java/com/xeiam/xchart/unit/ValueFormatterTest.java
index 4edb9ce5481b646becde8565df6c259149fb501b..61321f15ca8f07b7beeee86adecfcaccb65d9177 100644
--- a/xchart/src/test/java/com/xeiam/xchart/unit/ValueFormatterTest.java
+++ b/xchart/src/test/java/com/xeiam/xchart/unit/ValueFormatterTest.java
@@ -30,8 +30,8 @@ import java.util.TimeZone;
import org.junit.Test;
-import com.xeiam.xchart.internal.chartpart.gridstep.DateFormatter;
-import com.xeiam.xchart.internal.chartpart.gridstep.DecimalFormatter;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DateFormatter;
+import com.xeiam.xchart.internal.chartpart.axistickcalculator.DecimalFormatter;
/**
* @author timmolter