Jfreechart：甘特图中的绘制线箭头
我想绘制一些垂直线来跟踪任务，如下图中的红线所示。我相信可以使用Gantt Renderer绘制线条。
我想要的是在绘制任务期间存储线条终点的坐标，然后最终在图中绘制这些线条。
我想知道是否有一种方法可以让您在绘图上绘制任何内容，以及这是否是解决此问题的正确方法。
以下是甘特图渲染器的代码：
public class Renderer extends GanttRenderer {
private Color markerColorChannel = Color.BLUE;
private Color markerColorFunction = new Color(138,43,226);
private Color functionDurationMarkerColor = new Color(0,100,0);
private boolean functionTrace = false;
private List<ProcessorTask> listOfDrawingTask = new ArrayList<ProcessorTask>();
/**
* CONSTRUCTOR
*
* @param model
*/
public Renderer() {
}
/**
* This method is used to draw the task/subtasks for each channel or row item.
* The method is called each time the gannt chart is repainted: including zooming,
* sliding and changes to gannt chart input configurations.
*
* @param g2 The graphics device.
* @param state The renderer state.
* @param dataArea The data plot area.
* @param plot The plot.
* @param domainAxis The domain axis.
* @param rangeAxis The range axis.
* @param dataset The set of data to be drawn
* @param row The row index (zero-based).
* @param column Indicates the index of the task item to be drawn (starts from zero)
*/
// DRAW TASKS
@Override
protected void drawTasks(Graphics2D g2, CategoryItemRendererState state, Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
ValueAxis rangeAxis, GanttCategoryDataset dataset, int row, int column) {
try {
// plot.setDomainCrosshairVisible(true);
// plot.setRangeCrosshairVisible(true);
// System.out.println("ROW: " + row + " COL: " + column + " time " + System.currentTimeMillis());
/* Get the total number of subtasks in the channel or row item*/
int count = dataset.getSubIntervalCount(row, column);
/* If the item contains no subtask the count is zero. Then draw only the single task. */
if (count == 0) {
drawTask(g2, state, dataArea, plot, domainAxis, rangeAxis, dataset, row, column);
}
/*If the item contains subtasks, loop through each of them*/
for (int subinterval = 0; subinterval < count; subinterval++) {
RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
Number subtaskStart; // start time
Number subtaskEnd; // end time
double subtaskStartTranslated;
double subtaskEndTranslated;
/* Sub task start time */
subtaskStart = dataset.getStartValue(row, column, subinterval);
if (subtaskStart == null) {
System.out.println("No starting time for subtask " + subinterval + " item " + column + " found!");
return;
}
subtaskStartTranslated = rangeAxis.valueToJava2D(subtaskStart.doubleValue(), dataArea, rangeAxisLocation);
/* Sub task end time */
subtaskEnd = dataset.getEndValue(row, column, subinterval);
if (subtaskEnd == null) {
System.out.println("No end time for subtask " + subinterval + " item " + column + " found!");
return;
}
subtaskEndTranslated = rangeAxis.valueToJava2D(subtaskEnd.doubleValue(), dataArea, rangeAxisLocation);
/*Set the rectangular bar properties*/
double rectYAxisStart;
double rectLength;
double rectBreadth;
Rectangle2D bar = null;
Number percent; // task percentage completion
rectYAxisStart = calculateBarW0(plot, plot.getOrientation(), dataArea, domainAxis, state, row, column);
rectLength = Math.abs(subtaskEndTranslated - subtaskStartTranslated);
rectBreadth = state.getBarWidth();
percent = dataset.getPercentComplete(row, column, subinterval);
/*Draw the rectangular bar*/
if (plot.getOrientation() == PlotOrientation.HORIZONTAL) { // horizontal is applied for the ganntchart
bar = new Rectangle2D.Double(subtaskStartTranslated, rectYAxisStart, rectLength, rectBreadth);
} else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
bar = new Rectangle2D.Double(rectYAxisStart, subtaskStartTranslated, rectBreadth, rectLength);
}
/*Drawing the task completion bar in the subtask bar:
* This feature is currently not needed in the gantt chart*/
/* Painting the task/subtask */
Paint seriesPaint = getItemPaint(row, column, subinterval);
g2.setPaint(seriesPaint);
g2.fill(bar);
if (isDrawBarOutline() && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
g2.setStroke(getItemStroke(row, column));
g2.setPaint(getItemOutlinePaint(row, column));
g2.draw(bar);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* This method is used to paint the subtasks of a channel or row item
* @param row
* @param col Index of the channel or the row item
* @param subinterval Index of the subtask
* @return Paint Item
*/
private Paint getItemPaint(int row, int col, int subinterval) {
return this.listOfDrawingTask.get(col).getSubTaskColorList().get(subinterval);
}
}
更新
似乎LineAnnotations是实现这些线条的最佳方式。 Link1
1 个答案:
答案 0 :(得分：0)
可以使用CategoryLineAnnotation将线条添加到甘特图上。线注释被添加到图中。
CategoryPlot plot = (CategoryPlot) chart.getPlot();
plot.addAnnotation(new CategoryLineAnnotation("Category 2", 5.0,
"Category 4", 8.0, Color.red, new BasicStroke(2.0f)));
以下为MCV example David Gilbert：
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------------
* BarChartDemo1.java
* ------------------
* (C) Copyright 2003-2007, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): ;
*
* Changes
* -------
* 09-Mar-2005 : Version 1 (DG);
*
*/
package org.jfree.chart.demo;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.annotations.CategoryLineAnnotation;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
/**
* A simple demonstration application showing how to create a bar chart.
*/
public class BarChartDemo1 extends ApplicationFrame {
/**
* Creates a new demo instance.
*
* @param title the frame title.
*/
public BarChartDemo1(String title) {
super(title);
CategoryDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart, false);
chartPanel.setPreferredSize(new Dimension(500, 270));
setContentPane(chartPanel);
}
/**
* Returns a sample dataset.
*
* @return The dataset.
*/
private static CategoryDataset createDataset() {
// row keys...
String series1 = "First";
String series2 = "Second";
String series3 = "Third";
// column keys...
String category1 = "Category 1";
String category2 = "Category 2";
String category3 = "Category 3";
String category4 = "Category 4";
String category5 = "Category 5";
// create the dataset...
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(1.0, series1, category1);
dataset.addValue(4.0, series1, category2);
dataset.addValue(3.0, series1, category3);
dataset.addValue(5.0, series1, category4);
dataset.addValue(5.0, series1, category5);
dataset.addValue(5.0, series2, category1);
dataset.addValue(7.0, series2, category2);
dataset.addValue(6.0, series2, category3);
dataset.addValue(8.0, series2, category4);
dataset.addValue(4.0, series2, category5);
dataset.addValue(4.0, series3, category1);
dataset.addValue(3.0, series3, category2);
dataset.addValue(2.0, series3, category3);
dataset.addValue(3.0, series3, category4);
dataset.addValue(6.0, series3, category5);
return dataset;
}
/**
* Creates a sample chart.
*
* @param dataset the dataset.
*
* @return The chart.
*/
private static JFreeChart createChart(CategoryDataset dataset) {
// create the chart...
JFreeChart chart = ChartFactory.createBarChart(
"Bar Chart Demo 1", // chart title
"Category", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.VERTICAL, // orientation
true, // include legend
true, // tooltips?
false // URLs?
);
// NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...
// set the background color for the chart...
chart.setBackgroundPaint(Color.white);
// get a reference to the plot for further customisation...
CategoryPlot plot = (CategoryPlot) chart.getPlot();
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinePaint(Color.white);
plot.addAnnotation(new CategoryLineAnnotation("Category 2", 5.0,
"Category 4", 8.0, Color.red, new BasicStroke(2.0f)));
// ******************************************************************
// More than 150 demo applications are included with the JFreeChart
// Developer Guide...for more information, see:
//
// > http://www.object-refinery.com/jfreechart/guide.html
//
// ******************************************************************
// set the range axis to display integers only...
final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
// disable bar outlines...
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setDrawBarOutline(false);
// set up gradient paints for series...
GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, Color.blue,
0.0f, 0.0f, new Color(0, 0, 64));
GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, Color.green,
0.0f, 0.0f, new Color(0, 64, 0));
GradientPaint gp2 = new GradientPaint(0.0f, 0.0f, Color.red,
0.0f, 0.0f, new Color(64, 0, 0));
renderer.setSeriesPaint(0, gp0);
renderer.setSeriesPaint(1, gp1);
renderer.setSeriesPaint(2, gp2);
CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setCategoryLabelPositions(
CategoryLabelPositions.createUpRotationLabelPositions(
Math.PI / 6.0));
// OPTIONAL CUSTOMISATION COMPLETED.
return chart;
}
/**
* Starting point for the demonstration application.
*
* @param args ignored.
*/
public static void main(String[] args) {
BarChartDemo1 demo = new BarChartDemo1("Bar Chart Demo 1");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
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