I have like total of 500 array list in my program as HashMap and want to generate graph for each list (500 graphs in total). I used the below code to draw a single graph..
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
@SuppressWarnings("serial")
public class DrawGraph extends JPanel {
private static final int PREF_W = 1000;
private static final int PREF_H = 800;
private static final int BORDER_GAP = 25;
private static final int PADDING = 25;
private static final Color GRAPH_COLOR = Color.green;
private static final Color GRAPH_POINT_COLOR = new Color(100, 100, 100, 180);
private static final Color GRID_COLOR = new Color(200, 200, 200, 200);
private static final Stroke GRAPH_STROKE = new BasicStroke(3f);
private static final int GRAPH_POINT_WIDTH = 4;
private static final int Y_HATCH_CNT = 10;
private List<Double> scores;
public DrawGraph(List<Double> scores2) {
this.scores = scores2;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
double xScale = ((double) getWidth() - (2 * BORDER_GAP)-PADDING) / (scores.size() - 1);
double yScale = ((double) getHeight() - (2 * BORDER_GAP)-PADDING) / (getMaxScore() - getMinScore());
List<Point> graphPoints = new ArrayList<Point>();
for (int i = 0; i < scores.size(); i++) {
int x1 = (int) (i * xScale + BORDER_GAP + PADDING);
int y1 = (int) ((getMaxScore() - scores.get(i)) * yScale + BORDER_GAP);
graphPoints.add(new Point(x1, y1));
}
g2.setColor(Color.WHITE);
g2.fillRect(BORDER_GAP + PADDING, BORDER_GAP, getWidth() - (2 * BORDER_GAP) - PADDING, getHeight() - 2 * BORDER_GAP - PADDING);
g2.setColor(Color.BLACK);
g2.drawLine(BORDER_GAP + PADDING, getHeight() - BORDER_GAP - PADDING, BORDER_GAP + PADDING, BORDER_GAP);
g2.drawLine(BORDER_GAP + PADDING, getHeight() - BORDER_GAP - PADDING, getWidth() - BORDER_GAP, getHeight() - BORDER_GAP - PADDING);
for (int i = 0; i < Y_HATCH_CNT + 1; i++) {
int x0 = BORDER_GAP + PADDING;
int x1 = GRAPH_POINT_WIDTH + BORDER_GAP + PADDING;
int y0 = getHeight() - ((i * (getHeight() - BORDER_GAP * 2 - PADDING)) / Y_HATCH_CNT + BORDER_GAP + PADDING);
int y1 = y0;
if (scores.size() > 0) {
g2.setColor(GRID_COLOR);
g2.drawLine(BORDER_GAP + PADDING + 1 + GRAPH_POINT_WIDTH, y0, getWidth() - BORDER_GAP, y1);
g2.setColor(Color.BLACK);
String yLabel = ((int) ((getMinScore() + (getMaxScore() - getMinScore()) * ((i * 1.0) / Y_HATCH_CNT)) * 100)) / 100.0 + "";
FontMetrics metrics = g2.getFontMetrics();
int labelWidth = metrics.stringWidth(yLabel);
g2.drawString(yLabel, x0 - labelWidth - 5, y0 + (metrics.getHeight() / 2) - 3);
}
g2.drawLine(x0, y0, x1, y1);
}
for (int i = 0; i < scores.size(); i++) {
if (scores.size() > 1) {
int x0 = i * (getWidth() - BORDER_GAP * 2 - PADDING) / (scores.size() - 1) + BORDER_GAP + PADDING;
int x1 = x0;
int y0 = getHeight() - BORDER_GAP - PADDING;
int y1 = y0 - GRAPH_POINT_WIDTH;
if ((i % ((int) ((scores.size() / 20.0)) + 1)) == 0) {
g2.setColor(GRID_COLOR);
g2.drawLine(x0, getHeight() - BORDER_GAP - PADDING - 1 - GRAPH_POINT_WIDTH, x1, BORDER_GAP);
g2.setColor(Color.BLACK);
String xLabel = i + "";
FontMetrics metrics = g2.getFontMetrics();
int labelWidth = metrics.stringWidth(xLabel);
g2.drawString(xLabel, x0 - labelWidth / 2, y0 + metrics.getHeight() + 3);
}
g2.drawLine(x0, y0, x1, y1);
}
}
Stroke oldStroke = g2.getStroke();
g2.setColor(GRAPH_COLOR);
g2.setStroke(GRAPH_STROKE);
for (int i = 0; i < graphPoints.size() - 1; i++) {
int x1 = graphPoints.get(i).x;
int y1 = graphPoints.get(i).y;
int x2 = graphPoints.get(i + 1).x;
int y2 = graphPoints.get(i + 1).y;
g2.drawLine(x1, y1, x2, y2);
}
g2.setStroke(oldStroke);
g2.setColor(GRAPH_POINT_COLOR);
for (int i = 0; i < graphPoints.size(); i++) {
int x = graphPoints.get(i).x - GRAPH_POINT_WIDTH / 2;
int y = graphPoints.get(i).y - GRAPH_POINT_WIDTH / 2;;
int ovalW = GRAPH_POINT_WIDTH;
int ovalH = GRAPH_POINT_WIDTH;
g2.fillOval(x, y, ovalW, ovalH);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(PREF_W, PREF_H);
}
private double getMinScore() {
double minScore = Double.MAX_VALUE;
for (Double score : scores) {
minScore = Math.min(minScore, score);
}
return minScore;
}
private double getMaxScore() {
double maxScore = Double.MIN_VALUE;
for (Double score : scores) {
maxScore = Math.max(maxScore, score);
}
return maxScore;
}
public static void createAndShowGui(ArrayList<Double> scores, String s) {
DrawGraph mainPanel = new DrawGraph(scores);
JFrame frame = new JFrame(s);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String args[]) {
final ArrayList<Double> inputValues = new ArrayList<Double>();
// Read input values from text document and store in ArrayList
SwingUtilities.invokeLater(new Runnable() {
public void run() {
DrawGraph.createAndShowGui(inputValues, "MyGraphTitle");
}
});
}
}
When i provided 20 sample array list as input it plot and displays 20 graphs correctly..But i want to save the graph as an image in my system without displaying it as a separate window since when plotting 500 graphs i dont want to open 500 windows. Is there any option to save the graph as image after plotting it.? I checked few methods online but im not sure how to integrate the saving as image code with this particular graph generation code that uses 2D Graphics.
