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This charting library ${project.artifactId}- is an extension
in the spirit of Oracle's XYChart and performance/time-proven JDataViewer charting functionalities.
Emphasis was put on plotting performance for both large number of data points and real-time displays,
as well as scientific accuracies leading to error bar/surface plots, and other scientific plotting
features (parameter measurements, fitting, multiple axes, zoom, ...).
package de.gsi.chart.axes.spi;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import de.gsi.chart.axes.AxisLabelOverlapPolicy;
import de.gsi.dataset.DataSet;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.util.StringConverter;
/**
* A axis implementation that will works on string categories where each value as a unique category(tick mark) along the
* axis.
*/
public final class CategoryAxis extends DefaultNumericAxis {
private boolean forceAxisCategories = false;
private final List allDataCategories = new ArrayList<>();
private boolean changeIsLocal = false;
private final ObjectProperty> categories = new ObjectPropertyBase>() {
@Override
public Object getBean() {
return CategoryAxis.this;
}
@Override
public String getName() {
return "categories";
}
};
/**
* The ordered list of categories plotted on this axis. This is set automatically based on the charts data if
* autoRanging is true. If the application sets the categories then auto ranging is turned off. If there is an
* attempt to add duplicate entry into this list, an {@link IllegalArgumentException} is thrown. setting the
* category via axis forces the axis' category, setting the axis categories to null forces the dataset's category
*
* @param categoryList the category list
*/
public void setCategories(final ObservableList categoryList) {
if (categoryList == null) {
forceAxisCategories = false;
setCategories(FXCollections. observableArrayList());
return;
}
setTickLabelFormatter(new StringConverter() {
@Override
public String toString(Number object) {
final int index = Math.round(object.floatValue());
if (index < 0 || index >= getCategories().size()) {
return "unknown category";
}
return getCategories().get(index);
}
@Override
public Number fromString(String string) {
for (int i = 0; i < getCategories().size(); i++) {
if (getCategories().get(i).equalsIgnoreCase(string)) {
return i;
}
}
throw new IllegalArgumentException("Category not found.");
}
});
categories.set(categoryList);
if (!changeIsLocal) {
allDataCategories.clear();
allDataCategories.addAll(getCategories());
}
requestAxisLayout();
}
/**
* @param categories list of strings
*/
public void setCategories(final List categories) {
if (categories == null) {
forceAxisCategories = false;
setCategories(FXCollections. observableArrayList());
return;
}
forceAxisCategories = true;
setCategories(FXCollections.observableArrayList(categories));
}
/**
* Returns a {@link ObservableList} of categories plotted on this axis.
*
* @return ObservableList of categories for this axis.
* @see #categories
*/
public ObservableList getCategories() {
return categories.get();
}
@Override
protected AxisRange autoRange(final double minValue, final double maxValue, final double length,
final double labelSize) {
double min = minValue > 0 && isForceZeroInRange() ? 0 : minValue;
if (isLogAxis && minValue <= 0) {
min = DefaultNumericAxis.DEFAULT_LOG_MIN_VALUE;
isUpdating = true;
setLowerBound(DefaultNumericAxis.DEFAULT_LOG_MIN_VALUE);
isUpdating = false;
}
final double max = maxValue < 0 && isForceZeroInRange() ? 0 : maxValue;
final double padding = DefaultNumericAxis.getEffectiveRange(min, max) * getAutoRangePadding();
final double paddingScale = 1.0 + getAutoRangePadding();
// compared to DefaultNumericAxis clamping wasn't really necessary for
// CategoryAxis
// N.B. it was unnecessarily forcing the first bound to 0 (rather than
// -0.5)
final double paddedMin = isLogAxis ? minValue / paddingScale : min - padding;
final double paddedMax = isLogAxis ? maxValue * paddingScale : max + padding;
return computeRange(paddedMin, paddedMax, length, labelSize);
}
// -------------- CONSTRUCTORS
// -------------------------------------------------------------------------------------
/**
* Create a auto-ranging category axis with an empty list of categories.
*/
public CategoryAxis() {
this((String) null);
setTickUnit(1.0);
changeIsLocal = true;
setCategories(FXCollections. observableArrayList());
changeIsLocal = false;
}
/**
* Create a {@link #autoRangingProperty() non-auto-ranging} Axis with the given upper bound, lower bound and tick
* unit.
*
* @param axisLabel the axis {@link #labelProperty() label}
*/
public CategoryAxis(final String axisLabel) {
super(axisLabel);
this.setOverlapPolicy(AxisLabelOverlapPolicy.SHIFT_ALT);
lowerBoundProperty().addListener((ch, old, val) -> {
final double range = Math.abs(val.doubleValue() - CategoryAxis.this.getUpperBound());
final double rangeInt = (int) range;
final double scale = 0.5 / rangeInt;
autoRangePaddingProperty().set(scale);
});
upperBoundProperty().addListener((ch, old, val) -> {
final double range = Math.abs(CategoryAxis.this.getLowerBound() - val.doubleValue());
final double rangeInt = (int) range;
final double scale = 0.5 / rangeInt;
autoRangePaddingProperty().set(scale);
});
}
/**
* Create a category axis with the given categories. This will not auto-range but be fixed with the given
* categories.
*
* @param categories List of the categories for this axis
*/
public CategoryAxis(final ObservableList categories) {
this(null, categories);
}
/**
* Create a {@link #autoRangingProperty() non-auto-ranging} Axis with the given upper bound, lower bound and tick
* unit.
*
* @param axisLabel the axis {@link #labelProperty() label}
* @param categories List of the categories for this axis
*/
public CategoryAxis(final String axisLabel, final ObservableList categories) {
super(axisLabel, 0, categories.size(), 1.0);
changeIsLocal = true;
setCategories(categories);
changeIsLocal = false;
}
// -------------- METHODS
// ------------------------------------------------------------------------------------------
/**
* Update the categories based on the data labels attached to the DataSet values
*
* @param dataSet data set from which the data labels are used as category
* @return true is categories were modified, false, false otherwise
*/
public boolean updateCategories(final DataSet dataSet) {
if (dataSet == null || forceAxisCategories) {
return false;
}
boolean zeroDataLabels = true;
final List newCategoryList = new ArrayList<>();
dataSet.lock();
for (int i = 0; i < dataSet.getDataCount(); i++) {
final String dataLabel = dataSet.getDataLabel(i);
String sanitizedLabel;
if (dataLabel == null) {
sanitizedLabel = "unknown category";
} else {
sanitizedLabel = dataLabel;
zeroDataLabels = false;
}
newCategoryList.add(sanitizedLabel);
}
dataSet.unlock();
if (!zeroDataLabels) {
setCategories(newCategoryList);
forceAxisCategories = false;
}
return false;
}
@Override
protected List calculateMinorTickValues() {
return Collections.emptyList();
}
@Override
protected double computeTickUnit(final double rawTickUnit) {
return 1.0;
}
}