Update ! |
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| This bar chart compoment has now been moved into the Iceberg Charts project . Please use Iceberg Charts for a more complete charting experience. | ||
I’ve created a little Java component which creates bar graphs. It only displays bars along the Y axis, however the component is very versatile and configurable. You can change its size, fonts, ticks on the Y-axis, and bar width.
Here are some examples of using it :
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ArrayList values = new ArrayList(); values.add(new Bar(90, Color.RED, "Apple")); values.add(new Bar(14, Color.BLUE, "Banana")); values.add(new Bar(67, Color.GREEN, "Plum")); values.add(new Bar(30, Color.ORANGE, "Radish")); values.add(new Bar(10, Color.YELLOW, "Corn")); int primaryIncrements = 20; int secondaryIncrements = 10; int tertiaryIncrements = 5; Axis yAxis = new Axis(100, 0, primaryIncrements, secondaryIncrements, tertiaryIncrements, "Number of Fruits"); BarChart barChart = new BarChart(values, yAxis); |
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ArrayList values = new ArrayList(); values.add(new Bar(10, Color.BLACK, "1")); values.add(new Bar(14, Color.BLUE, "2")); values.add(new Bar(300, Color.BLACK, "3")); values.add(new Bar(12, Color.BLUE, "4")); values.add(new Bar(18, Color.BLACK, "5")); values.add(new Bar(19, Color.BLUE, "6")); values.add(new Bar(23, Color.BLACK, "7")); values.add(new Bar(33, Color.BLUE, "8")); values.add(new Bar(11, Color.BLACK, "9")); values.add(new Bar(33, Color.BLUE, "10")); values.add(new Bar(11, Color.BLACK, "11")); values.add(new Bar(33, Color.BLUE, "12")); values.add(new Bar(11, Color.BLACK, "13")); values.add(new Bar(88, Color.BLUE, "14")); values.add(new Bar(5, Color.BLACK, "15")); Axis yAxis2 = new Axis(500, 0, 50, 0, 0, "Numbers"); BarChart barChart2 = new BarChart(values, yAxis2); barChart2.topOffset = 160; barChart2.xFont = new Font("Blackadder ITC", Font.PLAIN, 20); barChart2.yFont = new Font("Blackadder ITC", Font.PLAIN, 20); barChart2.xAxis = "Playing with fonts"; barChart2.xCatFont = new Font("Blackadder ITC", Font.PLAIN, 14); barChart2.yCatFont = new Font("Blackadder ITC", Font.PLAIN, 16); barChart2.titleFont = new Font("Ravie", Font.PLAIN, 70); barChart2.title = "Really Big Text"; barChart2.width = 900; |
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ArrayList values = new ArrayList(); values.add(new Bar(40, Color.PINK, "Mini")); values.add(new Bar(30, Color.CYAN, "Smart Car")); values.add(new Bar(80, Color.ORANGE, "Beetle")); Axis yAxis3 = new Axis(100, 0, 50, 20, 5, "Cuteness Factor"); BarChart barChart3 = new BarChart(values, yAxis3); barChart3.width = 240; barChart3.height = 200; barChart3.leftOffset = 60; barChart3.rightOffset = 60; barChart3.topOffset = 60; barChart3.bottomOffset = 60; barChart3.barWidth = 30; barChart3.xLabelOffset = 20; barChart3.title = "Small Cars"; barChart3.xAxis = "Small Thing"; barChart3.xCatFont = new Font("Ariel", Font.PLAIN, 6); |
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ArrayList values = new ArrayList(); for (int i = 0; i < 365; i++) { double d = Math.random(); values.add(new Bar((int)(100 * d), Color.GRAY, "")); } Axis yAxis4 = new Axis(100, 0, 50, 10, 1, "Percent Sunlight"); BarChart barChart4 = new BarChart(values, yAxis4); barChart4.width = 1000; barChart4.xAxis = "Day of Year"; barChart4.titleFont = new Font("Ariel", Font.PLAIN, 24); barChart4.title = "Annual Sunlight Variability"; barChart4.barWidth = 1; |
The code is below. It’s basically three classes: BarChart, Bar and Axis.
A few things to note :
- It is highly customizable. All the package level fields in BarChart can modified.
- The Y-Axis can have up to 3 categories of ticks. In the Axis constructor, you just need to set the second and third to zero if you don’t want to used them (See my examples).
- It is geometrically relative, however you can have problems with it. The key things to know are width and height, and leftOffset, rightOffset, topOffset and bottomOffset. The offsets need to be big enough to accomodate a title with a very large font (again see my examples).
Please let me know if this component has been useful to you. I spent a lot of time creating it, so a little feedback would be very important to me
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/** * @copyright 2014 * @author Oliver Watkins (www.blue-walrus.com) * * All Rights Reserved */ package com.bluewalrus; import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.util.ArrayList; import javax.swing.JPanel; /** * @copyright * @author Oliver Watkins * * (www.blue-walrus.com) All Rights Reserved */ public class BarChart extends JPanel { //offsets (padding of actual chart to its border) int leftOffset = 140; int topOffset = 120; int bottomOffset = 100; int rightOffset = 15; //height of X labels (must be significantly smaller than bottomOffset) int xLabelOffset = 40; //width of Y labels (must be significantly smaller than leftOffset) int yLabelOffset = 40; //tick widths int majorTickWidth = 10; int secTickWidth = 5; int minorTickWidth = 2; String xAxis = "X Axis"; String yAxisStr = "Y Axis"; String title = "My Fruits"; int width = 500; //total width of the component int height = 430; //total height of the component Color textColor = Color.BLACK; Color backgroundColor = Color.WHITE; Font textFont = new Font("Arial", Font.BOLD, 20); Font yFont = new Font("Arial", Font.PLAIN, 12); Font xFont = new Font("Arial", Font.BOLD, 12); Font titleFont = new Font("Arial", Font.BOLD, 18); Font yCatFont = new Font("Arial", Font.BOLD, 12); Font xCatFont = new Font("Arial", Font.BOLD, 12); ArrayList bars; Axis yAxis; int barWidth = 10; /** * Construct BarChart * * @param bars a number of bars to display * @param yAxis Axis object describes how to display y Axis */ BarChart(ArrayList bars, Axis yAxis) { this.bars = bars; this.yAxis = yAxis; this.yAxisStr = yAxis.yLabel; } @Override protected void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, // Anti-alias! RenderingHints.VALUE_ANTIALIAS_ON); g.drawRect(0, 0, width, height); g2d.setColor(backgroundColor); g.fillRect(0, 0, width, height); g2d.setColor(Color.BLACK); int heightChart = height - (topOffset + bottomOffset); int widthChart = width - (leftOffset + rightOffset); //left g.drawLine(leftOffset, topOffset, leftOffset, heightChart + topOffset); //bottom g.drawLine(leftOffset, heightChart + topOffset, leftOffset + widthChart, heightChart + topOffset); if (this.yAxis.primaryIncrements != 0) drawTick(heightChart, this.yAxis.primaryIncrements, g, Color.BLACK, majorTickWidth); if (this.yAxis.secondaryIncrements != 0) drawTick(heightChart, this.yAxis.secondaryIncrements, g, Color.BLACK, secTickWidth); if (this.yAxis.tertiaryIncrements != 0) drawTick(heightChart, this.yAxis.tertiaryIncrements, g, Color.BLACK, minorTickWidth); drawYLabels(heightChart, this.yAxis.primaryIncrements, g, Color.BLACK); drawBars(heightChart, widthChart, g); drawLabels(heightChart, widthChart, g); } private void drawTick(int heightChart, int increment, Graphics g, Color c, int tickWidth) { int incrementNo = yAxis.maxValue / increment; double factor = ((double) heightChart / (double) yAxis.maxValue); double incrementInPixel = (double) (increment * factor); g.setColor(c); for (int i = 0; i < incrementNo; i++) { int fromTop = heightChart + topOffset - (int) (i * incrementInPixel); g.drawLine(leftOffset, fromTop, leftOffset + tickWidth, fromTop); } } private void drawYLabels(int heightChart, int increment, Graphics g, Color c) { int incrementNo = yAxis.maxValue / increment; double factor = ((double) heightChart / (double) yAxis.maxValue); int incrementInPixel = (int) (increment * factor); g.setColor(c); FontMetrics fm = getFontMetrics(yCatFont); for (int i = 0; i < incrementNo; i++) { int fromTop = heightChart + topOffset - (i * incrementInPixel); String yLabel = "" + (i * increment); int widthStr = fm.stringWidth(yLabel); int heightStr = fm.getHeight(); g.setFont(yCatFont); g.drawString(yLabel, (leftOffset - yLabelOffset) + (yLabelOffset/2 - widthStr/2), fromTop + (heightStr / 2)); } } private void drawBars(int heightChart, int widthChart, Graphics g) { int i = 0; int barNumber = bars.size(); int pointDistance = (int) (widthChart / (barNumber + 1)); for (Bar bar : bars) { i++; double factor = ((double) heightChart / (double) yAxis.maxValue); int scaledBarHeight = (int) (bar.value * factor); int j = topOffset + heightChart - scaledBarHeight; g.setColor(bar.color); g.fillRect(leftOffset + (i * pointDistance) - (barWidth / 2), j, barWidth, scaledBarHeight); //draw tick g.drawLine(leftOffset + (i * pointDistance), topOffset + heightChart, leftOffset + (i * pointDistance), topOffset + heightChart + 2); FontMetrics fm = getFontMetrics(xCatFont); int widthStr = fm.stringWidth(bar.name); int heightStr = fm.getHeight(); g.setFont(xCatFont); g.setColor(Color.BLACK); int xPosition = leftOffset + (i * pointDistance) - (widthStr / 2); int yPosition = topOffset + heightChart + xLabelOffset - heightStr/2; //draw tick g.drawString(bar.name, xPosition, yPosition); } } private void drawLabels(int heightChart, int widthChart, Graphics g) { Graphics2D g2d = (Graphics2D)g; AffineTransform oldTransform = g2d.getTransform(); FontMetrics fmY = getFontMetrics(yFont); int yAxisStringWidth = fmY.stringWidth(yAxisStr); int yAxisStringHeight = fmY.getHeight(); FontMetrics fmX = getFontMetrics(xFont); int xAxisStringWidth = fmX.stringWidth(yAxisStr); int xAxisStringHeight = fmX.getHeight(); FontMetrics fmT = getFontMetrics(titleFont); int titleStringWidth = fmT.stringWidth(title); int titleStringHeight = fmT.getHeight(); g2d.setColor(Color.BLACK); //draw tick g2d.rotate(Math.toRadians(270)); //rotates to above out of screen. int translateDown = -leftOffset -(topOffset + heightChart/2 + yAxisStringWidth/2); //starts off being "topOffset" off, so subtract that first int translateLeft = -topOffset + (leftOffset-yLabelOffset)/2 + yAxisStringHeight/2; //pull down, which is basically the left offset, topOffset, then middle it by //usin chart height and using text height. g2d.translate(translateDown, translateLeft); g2d.setFont(yFont); g2d.drawString(yAxisStr, leftOffset, topOffset); //reset g2d.setTransform(oldTransform); int xAxesLabelHeight = bottomOffset - xLabelOffset; //x label g2d.setFont(xFont); g2d.drawString(xAxis, widthChart/2 + leftOffset - xAxisStringWidth/2, topOffset + heightChart + xLabelOffset + xAxesLabelHeight/2); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, // Anti-alias! RenderingHints.VALUE_ANTIALIAS_ON); //title g2d.setFont(titleFont); int titleX = (leftOffset + rightOffset + widthChart)/2 - titleStringWidth/2; int titleY = topOffset/2 + titleStringHeight/2; System.out.println("titleStringHeight " + titleStringHeight); System.out.println("titleX " + titleX); System.out.println("titleY " + titleY); System.out.println("topOffset " + topOffset); g2d.drawString(title, titleX, titleY); } } package com.bluewalrus; import java.awt.Color; /** * @copyright 2014 * @author Oliver Watkins (www.blue-walrus.com) * * All Rights Reserved */ public class Bar { double value; Color color; String name; Bar(int value, Color color, String name) { this.value = value; this.color = color; this.name = name; } } package com.bluewalrus; /** * @copyright 2014 * @author Oliver Watkins (www.blue-walrus.com) * * All Rights Reserved */ public class Axis { int primaryIncrements = 0; int secondaryIncrements = 0; int tertiaryIncrements = 0; int maxValue = 100; int minValue = 0; String yLabel; Axis(String name) { this(100, 0, 50, 10, 5, name); } Axis(int primaryIncrements, int secondaryIncrements, int tertiaryIncrements, String name) { this(100, 0, primaryIncrements, secondaryIncrements, tertiaryIncrements, name); } Axis(Integer maxValue, Integer minValue, int primaryIncrements, int secondaryIncrements, int tertiaryIncrements, String name) { this.maxValue = maxValue; this.minValue = minValue; this.yLabel = name; if (primaryIncrements != 0) this.primaryIncrements = primaryIncrements; if (secondaryIncrements != 0) this.secondaryIncrements = secondaryIncrements; if (tertiaryIncrements != 0) this.tertiaryIncrements = tertiaryIncrements; } } |
This is a wrong code check it again…………..
for (Bar bar : bars) gives type mismatch
just change
“ArrayList bars;”
instead of
“ArrayList bars;”
How can i solve that part of code?
Change :
ArrayList bars;
To:
ArrayList bars;
Do the same in the constructor of BarChart aswell.
Change :
ArrayList bars;
To:
ArrayList < bars > ;
Do the same in the constructor of BarChart aswell.
Awesome, it worked like perfect. 2-3 minor misses, but I guess that because of configuration. You needed to add public for Bar and Axis constructor and define the type of arraylist in BarChart.java but that is something anybody can easily do.
Really appreciate it.