nicbh
asked on
Adding extra lines?
Hey,
The code in the 'related question' was suitable to me and I've managed to make a decent enough take on it but there's a few things I'm struggling with.
I've attached the code supplied. I've made a few changes like the increments of the data on the y axis.
I would like to be able to add another set of the data to the graph, I've added a new data array but when I go to edit the code that plots the second line it seems to mess with the previous one. I'm assuming this is something simple?
I'd also like to be able to change the X axis labels to days of the week rather than numbers. Could I just do this with some sort of loop?
Thanks in advance
PS I'm trying to avoid JFreeChart. I know it's awesome but I want the self satisfaction of having something I've done myself
The code in the 'related question' was suitable to me and I've managed to make a decent enough take on it but there's a few things I'm struggling with.
I've attached the code supplied. I've made a few changes like the increments of the data on the y axis.
I would like to be able to add another set of the data to the graph, I've added a new data array but when I go to edit the code that plots the second line it seems to mess with the previous one. I'm assuming this is something simple?
I'd also like to be able to change the X axis labels to days of the week rather than numbers. Could I just do this with some sort of loop?
Thanks in advance
PS I'm trying to avoid JFreeChart. I know it's awesome but I want the self satisfaction of having something I've done myself
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
public class LineGraph
{
public static void main(String[] args)
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new GraphPanel());
f.setSize(400,400);
f.setLocation(200,200);
f.setVisible(true);
}
}
class GraphPanel extends JPanel
{
final int
HPAD = 60,
VPAD = 40;
int[] data;
Font font;
public GraphPanel()
{
data = new int[] {
120, 190, 211, 75, 30, 290, 182, 65, 85, 120, 100, 101
};
font = new Font("lucida sans regular", Font.PLAIN, 16);
setBackground(Color.white);
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(font);
FontRenderContext frc = g2.getFontRenderContext();
int w = getWidth();
int h = getHeight();
// scales
float xInc = (w - HPAD - VPAD) / 11f;
float yInc = (h - 2*VPAD) / 10f;
int[] dataVals = getDataVals();
float yScale = dataVals[2] / 10f;
// ordinate
g2.draw(new Line2D.Double(HPAD, VPAD, HPAD, h - VPAD));
// tic marks
float x1 = HPAD, y1 = VPAD, x2 = HPAD - 3, y2;
for(int j = 0; j < 10; j++)
{
g2.draw(new Line2D.Double(x1, y1, x2, y1));
y1 += yInc;
}
// labels
String text; LineMetrics lm;
float xs, ys, textWidth, height;
for(int j = 0; j <= 10; j++)
{
text = String.valueOf(dataVals[1] - (int)(j * yScale));
textWidth = (float)font.getStringBounds(text, frc).getWidth();
lm = font.getLineMetrics(text, frc);
height = lm.getAscent();
xs = HPAD - textWidth - 7;
ys = VPAD + (j * yInc) + height/2;
g2.drawString(text, xs, ys);
}
// abcissa
g2.draw(new Line2D.Double(HPAD, h - VPAD, w - VPAD, h - VPAD));
// tic marks
x1 = HPAD; y1 = h - VPAD; y2 = y1 + 3;
for(int j = 0; j < 12; j++)
{
g2.draw(new Line2D.Double(x1, y1, x1, y2));
x1 += xInc;
}
// labels
ys = h - VPAD;
for(int j = 0; j < 12; j++)
{
text = String.valueOf(j + 1);
textWidth = (float)font.getStringBounds(text, frc).getWidth();
lm = font.getLineMetrics(text, frc);
height = lm.getHeight();
xs = HPAD + j * xInc - textWidth/2;
g2.drawString(text, xs, ys + height);
}
// plot data
x1 = HPAD;
yScale = (float)(h - 2*VPAD) / dataVals[2];
for(int j = 0; j < data.length; j++)
{
y1 = VPAD + (h - 2*VPAD) - (data[j] - dataVals[0]) * yScale;
if(j > 0)
g2.draw(new Line2D.Double(x1, y1, x2, y2));
x2 = x1;
y2 = y1;
x1 += xInc;
}
}
private int[] getDataVals()
{
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for(int j = 0; j < data.length; j++)
{
if(data[j] < min)
min = data[j];
if(data[j] > max)
max = data[j];
}
int span = max - min;
return new int[] { min, max, span };
}
}
robthewolf
Why reinvent the wheel. The point of having a rich langugar like this, with so many external packages like jfreechart is so that once someone has done it you don't have to. You can then spend you time on other more interesting things.
I have tried to fix bit but not fully, but now can easy do the rest
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
public class LineGraph
{
public static void main(String[] args)
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new GraphPanel());
f.setSize(400,400);
f.setLocation(200,200);
f.setVisible(true);
}
}
class GraphPanel extends JPanel
{
final int
HPAD = 60,
VPAD = 40;
int[] data;
int [] data2;
Font font;
public GraphPanel()
{
data = new int[] {
120, 190, 211, 75, 30, 290, 182, 65, 85, 120, 100, 101
};
data2 = new int[] {
12, 150, 21, 175, 130, 90, 12, 165, 185, 20, 80, 151
};
font = new Font("lucida sans regular", Font.PLAIN, 16);
setBackground(Color.white);
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(font);
FontRenderContext frc = g2.getFontRenderContext();
int w = getWidth();
int h = getHeight();
// scales
float xInc = (w - HPAD - VPAD) / 11f;
float yInc = (h - 2*VPAD) / 10f;
int[] dataVals = getDataVals();
float yScale = dataVals[2] / 10f;
// ordinate
g2.draw(new Line2D.Double(HPAD, VPAD, HPAD, h - VPAD));
// tic marks
float x1 = HPAD, y1 = VPAD, x2 = HPAD - 3, y2;
for(int j = 0; j < 10; j++)
{
g2.draw(new Line2D.Double(x1, y1, x2, y1));
y1 += yInc;
}
// labels
String text; LineMetrics lm;
float xs, ys, textWidth, height;
for(int j = 0; j <= 10; j++)
{
text = String.valueOf(dataVals[1] - (int)(j * yScale));
textWidth = (float)font.getStringBounds(text, frc).getWidth();
lm = font.getLineMetrics(text, frc);
height = lm.getAscent();
xs = HPAD - textWidth - 7;
ys = VPAD + (j * yInc) + height/2;
g2.drawString(text, xs, ys);
}
// abcissa
g2.draw(new Line2D.Double(HPAD, h - VPAD, w - VPAD, h - VPAD));
// tic marks
x1 = HPAD; y1 = h - VPAD; y2 = y1 + 3;
for(int j = 0; j < 12; j++)
{
g2.draw(new Line2D.Double(x1, y1, x1, y2));
x1 += xInc;
}
// labels
ys = h - VPAD;
String week[] = {"SUN","MON","TUE","WED","THU","FRI","SAT"};
for(int j = 0; j < 12; j++)
{
int r=j;
if(j>6){
r = j-6;
r = r-1;
}
text = week[r];
textWidth = (float)font.getStringBounds(text, frc).getWidth();
lm = font.getLineMetrics(text, frc);
height = lm.getHeight();
xs = HPAD + j * xInc - textWidth/2;
g2.drawString(text, xs, ys + height);
}
// plot data
x1 = HPAD;
float x22 = x1;
yScale = (float)(h - 2*VPAD) / dataVals[2];
for(int j = 0; j < data.length; j++)
{
y1 = VPAD + (h - 2*VPAD) - (data[j] - dataVals[0]) * yScale;
if(j > 0)
g2.draw(new Line2D.Double(x1, y1, x2, y2));
x2 = x1;
y2 = y1;
x1 += xInc;
}
// plot data2
for(int j = 0; j < data2.length; j++)
{
y1 = VPAD + (h - 2*VPAD) - (data2[j] - dataVals[0]) * yScale;
if(j > 0)
g2.draw(new Line2D.Double(x22, y1, x2, y2));
x2 = x22;
y2 = y1;
x22 += xInc;
}
}
private int[] getDataVals()
{
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for(int j = 0; j < data.length; j++)
{
if(data[j] < min)
min = data[j];
if(data[j] > max)
max = data[j];
}
int span = max - min;
return new int[] { min, max, span };
}
}
hi, please see if this is useful
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Perfect thanks