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POrotating coordinate plane for data and text in Java
 

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  1. POrotating coordinate plane for data and text in Java
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    <p>I need to:<br> 1.) move the origin and also rotate the coordinate plane so that x-values progress rightward and y-values progress upward from the new origin(which needs to be the bottom left corner of the inner, blue rectangle in the code below). This will enable me to plot points at x,y coordinate pairs in the code below.<br> 2.) plot rotated labels for the tic marks on the y-axis of the data plot.</p> <p>The code below sets up this problem. It works, except for two problems:<br> 1.) the data points are being plotted with the upper left hand corner as the origin and y-values descending downward<br> 2.) the labels for the tic marks on the y-axis are not being drawn on the screen</p> <p>Can anyone show me how to fix the code below so that it fixes these two problems and does what the first paragraph above describes?</p> <p>The code is in the following two java files:</p> <p>DataGUI.java </p> <pre><code>import java.awt.*; import java.util.ArrayList; import javax.swing.*; class DataGUI extends JFrame{ DataGUI() { super("X,Y Plot"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setPreferredSize(new Dimension(800, 400)); this.pack(); this.setSize(new Dimension(800, 600)); this.setLocationRelativeTo(null); setLayout(new GridLayout()); ArrayList&lt;Double&gt; myDiffs = new ArrayList&lt;Double&gt;(); myDiffs.add(25.0); myDiffs.add(9.0); myDiffs.add(7.0); myDiffs.add(16.0); myDiffs.add(15.0); myDiffs.add(6.0); myDiffs.add(2.0); myDiffs.add(8.0); myDiffs.add(2.0); myDiffs.add(27.0); myDiffs.add(14.0); myDiffs.add(12.0); myDiffs.add(19.0); myDiffs.add(10.0); myDiffs.add(11.0); myDiffs.add(8.0); myDiffs.add(19.0); myDiffs.add(2.0); myDiffs.add(16.0); myDiffs.add(5.0); myDiffs.add(18.0); myDiffs.add(23.0); myDiffs.add(9.0); myDiffs.add(4.0); myDiffs.add(8.0); myDiffs.add(9.0); myDiffs.add(3.0); myDiffs.add(3.0); myDiffs.add(9.0); myDiffs.add(13.0); myDiffs.add(17.0); myDiffs.add(7.0); myDiffs.add(0.0); myDiffs.add(2.0); myDiffs.add(3.0); myDiffs.add(33.0); myDiffs.add(23.0); myDiffs.add(26.0); myDiffs.add(12.0); myDiffs.add(12.0); myDiffs.add(19.0); myDiffs.add(14.0); myDiffs.add(9.0); myDiffs.add(26.0); myDiffs.add(24.0); myDiffs.add(13.0); myDiffs.add(19.0); myDiffs.add(2.0); myDiffs.add(7.0); myDiffs.add(28.0); myDiffs.add(15.0); myDiffs.add(2.0); myDiffs.add(5.0); myDiffs.add(17.0); myDiffs.add(2.0); myDiffs.add(16.0); myDiffs.add(19.0); myDiffs.add(2.0); myDiffs.add(31.0); DataPanel myPP = new DataPanel(myDiffs,this.getHeight(),this.getWidth()); this.add(myPP); this.setVisible(true);// Display the panel. } public static void main(String[] args){ DataGUI myDataGUI = new DataGUI(); myDataGUI.setVisible(true); } } </code></pre> <p>DataPanel.java <strong><em>(Note: I edited the code below to include trashgod's suggestions, but it still does not work.)</em></strong></p> <pre><code>import java.awt.*; import java.awt.geom.AffineTransform; import javax.swing.*; import java.text.DecimalFormat; import java.text.NumberFormat; import java.util.*; class DataPanel extends JPanel { Insets ins; // holds the panel's insets ArrayList&lt;Double&gt; myDiffs; double maxDiff = Double.NEGATIVE_INFINITY; double minDiff = Double.POSITIVE_INFINITY; double maxPlot; DataPanel(ArrayList&lt;Double&gt; Diffs, int h, int w){ setOpaque(true);// Ensure that panel is opaque. setPreferredSize(new Dimension(w, h)); setMinimumSize(new Dimension(w, h)); setMaximumSize(new Dimension(w, h)); myDiffs = Diffs; repaint(); this.setVisible(true); } protected void paintComponent(Graphics g){// Override paintComponent() method. super.paintComponent(g); //get data about plotting environment and about text int height = getHeight(); int width = getWidth(); ins = getInsets(); Graphics2D g2d = (Graphics2D)g; FontMetrics fontMetrics = g2d.getFontMetrics(); String xString = ("x-axis label"); int xStrWidth = fontMetrics.stringWidth(xString); int xStrHeight = fontMetrics.getHeight(); String yString = "y-axis label"; int yStrWidth = fontMetrics.stringWidth(yString); int yStrHeight = fontMetrics.getHeight(); String titleString ="Title of Graphic"; int titleStrWidth = fontMetrics.stringWidth(titleString); int titleStrHeight = fontMetrics.getHeight(); int leftMargin = ins.left; //set parameters for inner rectangle int hPad=10; int vPad = 6; int testLeftStartPlotWindow = ins.left+5+(3*yStrHeight); int testInnerWidth = width-testLeftStartPlotWindow-ins.right-hPad; getMaxMinDiffs(); getMaxPlotVal(); double increment = 5.0; int numTicks = (int)(maxPlot/increment);//will use numTicks for: remainder, leftStartPlotWindow, innerRectangle+labels+tickmarks int remainder = testInnerWidth%numTicks; int leftStartPlotWindow = testLeftStartPlotWindow-remainder; System.out.println("remainder is: "+remainder); int bottomPad = (3*xStrHeight)-vPad; int blueTop = ins.bottom+(vPad/2)+titleStrHeight; int blueHeight = height-bottomPad-blueTop; int blueWidth = blueHeight; int blueBottom = blueHeight+blueTop; //plot outer rectangle g.setColor(Color.red); int redWidth = width-leftMargin-1; g.drawRect(leftMargin, ins.bottom, redWidth, height-ins.bottom-1); //write top label g.setColor(Color.black); g.drawString(titleString, leftStartPlotWindow+((blueWidth/2)-(titleStrWidth/2)), titleStrHeight); // fill, then plot, inner rectangle g.setColor(Color.white); g.fillRect(leftStartPlotWindow, blueTop, blueWidth, blueHeight); g.setColor(Color.blue); g.drawRect(leftStartPlotWindow, blueTop, blueWidth, blueHeight); //scale the diffs to fit window double Scalar = blueWidth/maxPlot; ArrayList&lt;Double&gt; scaledDiffs = new ArrayList&lt;Double&gt;(); for(int e = 0;e&lt;myDiffs.size();e++){scaledDiffs.add(myDiffs.get(e)*Scalar);} //plot the scaled Diffs AffineTransform at = g2d.getTransform();//save the graphics context's transform g2d.translate(leftStartPlotWindow, blueTop);//translate origin to bottom-left corner of blue rectangle g2d.scale(1, -1);//invert the y-axis for(int w = 0;w&lt;scaledDiffs.size();w++){ if(w&gt;0){ double prior = scaledDiffs.get(w-1); int priorInt = (int)prior; double current = scaledDiffs.get(w); int currentInt = (int)current; g2d.drawOval(priorInt, currentInt, 4, 4); } } g2d.setTransform(at);//restore the transform for conventional rendering //write x-axis label g.setColor(Color.red); g.drawString(xString, leftStartPlotWindow+((blueWidth/2)-(xStrWidth/2)), height-ins.bottom-vPad); //write y-axis label g2d.rotate(Math.toRadians(-90), 0, 0);//rotate text 90 degrees counter-clockwise g.drawString(yString, -(height/2)-(yStrWidth/2), yStrHeight); g2d.rotate(Math.toRadians(+90), 0, 0);//rotate text 90 degrees clockwise // draw tick marks on x-axis NumberFormat formatter = new DecimalFormat("#0.0"); double k = (double)blueWidth/(double)numTicks; double iteration = 0; for(int h=0;h&lt;=numTicks;h++){ int xval = (int)(h*k); g.setColor(Color.red); g.drawLine(leftStartPlotWindow+xval, blueBottom+2, leftStartPlotWindow+xval, blueBottom+(xStrHeight/2));//draw tick marks g.drawString(formatter.format(iteration),leftStartPlotWindow+xval-(fontMetrics.stringWidth(Double.toString(iteration))/2),blueBottom+(xStrHeight/2)+13); iteration+=increment; } // draw tick marks on y-axis iteration = 0; for(int h=0;h&lt;=numTicks;h++){ int yval = (int)(h*k); g.setColor(Color.red); g.drawLine(leftStartPlotWindow-2, blueBottom-yval, leftStartPlotWindow-(yStrHeight/2), blueBottom-yval);//draw tick marks g2d.rotate(Math.toRadians(-90), 0, 0);//rotate text 90 degrees counter-clockwise g.drawString(formatter.format(iteration),leftStartPlotWindow-2,blueBottom-(fontMetrics.stringWidth(Double.toString(iteration))/2)); g2d.rotate(Math.toRadians(+90), 0, 0);//rotate text 90 degrees clockwise iteration+=increment; } } void getMaxMinDiffs(){// get max and min of Diffs for(int u = 0;u&lt;myDiffs.size();u++){ if(myDiffs.get(u)&gt;maxDiff){maxDiff = myDiffs.get(u);} if(myDiffs.get(u)&lt;minDiff){minDiff = myDiffs.get(u);} } } void getMaxPlotVal(){ maxPlot = maxDiff; maxPlot += 1;//make sure maxPlot is bigger than the max data value while(maxPlot%5!=0){maxPlot+=1;}//make sure maxPlot is a multiple of 5 } } </code></pre> <p>Also, as always, links to articles or tutorials on the topic are much appreciated.</p>
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    1. COUnrelated to the problem at hand, but the data added to the ArrayList should be held in a data file, not hard-coded in the program.
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    2. CO@Hovercraft Full Of Eels, Yes, I know. In fact, the data is the result of some array operations and is much longer than the dataset above. However, I loaded it the way I did above so that it would be more easily reproducable for people on this site.
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    3. COConsider `List<Double> myDiffs = new ArrayList<Double>(Arrays.asList(25.0, 9.0, 7.0, …))`.
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