Databases
StackOverflow2013
Postsdbo
POJava and Algebra
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJava and Algebra
    primarykey
    data
    text
    <p>I'm making a program that will find a fraction of the distance between two points from a point. The Problem is, is that I need an algorithm to find the X distance between two points as well as the Y distance, not just the straight distance in itself.</p> <pre><code>For example, 2/3 the distance from A to B. (A and B being on a graph) try { String a; a = x1_tf.getText().toString(); double x1 = Integer.parseInt(a); a = y1_tf.getText().toString(); double y1 = Integer.parseInt(a); a = x2_tf.getText().toString(); double x2 = Integer.parseInt(a); a = y2_tf.getText().toString(); double y2 = Integer.parseInt(a); double Ax,Ay, x = 0,y = 0,nx,ny,fx = 0,fy = 0; double numerator = Integer.parseInt(fracx_tf.getText().toString()); double denominator = Integer.parseInt(fracy_tf.getText().toString()); if(fromwhat_combobox.getSelectedIndex()==0) { Ax = Integer.parseInt(x1_tf.getText().toString()); Ay = Integer.parseInt(y1_tf.getText().toString()); //problem below x += Math.sqrt(Math.pow(Ax, 2)) + Math.sqrt(Math.pow(Ay, 2)); y += Math.sqrt(Math.pow(Ay, 2)) + Math.sqrt(Math.pow(Ax, 2)); //problem lies here ^^^^ } else { Ax = Integer.parseInt(x2_tf.getText().toString()); Ay = Integer.parseInt(y2_tf.getText().toString()); //problem below x += Math.sqrt(Math.pow(Ax, 2)) + Math.sqrt(Math.pow(Ay, 2)); y += Math.sqrt(Math.pow(Ay, 2)) + Math.sqrt(Math.pow(Ax, 2)); //problem lies here ^^^^ } nx = (x*numerator)/denominator; ny = (y*numerator)/denominator; fx = Ax + nx; if((y2-y1)/(x2-x1)&gt;=0) { fy = Ay + ny; } else { fy = Ay - ny; } String answer = "("+fx+","+fy+") is "+numerator+"/"+denominator+" way from "; output_pane.setText(answer); }catch(Exception e){} </code></pre> <p>All of the other code works fine, I just need help with an algorithm that finds the distance between two points on the x-grid as well as the y-grid. The only thing I can think of is a complicated for-loop or a giant nest of if loops.</p> <p>JUST TO CLARIFY : </p> <p>fromwhat_combobox is a selection of what point to use, IE, 2/5 the distance from which point, Ax and Ay represent the coordinates of that point. The rest is easy to figure.</p> <p>Complete code...</p> <pre><code>import java.awt.event.FocusEvent; public class DistanceBetweenPointsCALC extends javax.swing.JFrame { public DistanceBetweenPointsCALC() { initComponents(); //default init components cinitComponents(); // custom init components oinitComponents(); } @SuppressWarnings("unchecked") // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt; private void initComponents() { calc_button = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); output_pane = new javax.swing.JTextPane(); y1_tf = new javax.swing.JTextField(); x2_tf = new javax.swing.JTextField(); y2_tf = new javax.swing.JTextField(); x1_tf = new javax.swing.JTextField(); frac_checkbox = new javax.swing.JCheckBox(); fromwhat_combobox = new javax.swing.JComboBox(); fracx_tf = new javax.swing.JTextField(); fracy_tf = new javax.swing.JTextField(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); calc_button.setText("Calc"); jScrollPane1.setViewportView(output_pane); y1_tf.setText("Y1"); x2_tf.setText("X2"); y2_tf.setText("Y2"); x1_tf.setText("X1"); frac_checkbox.setText("Fraction of the Distance"); fromwhat_combobox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "From X1", "From X2" })); fracx_tf.setText("frac x"); fracy_tf.setText("frac y"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jScrollPane1) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false) .addComponent(calc_button, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 156, Short.MAX_VALUE) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false) .addComponent(x2_tf, javax.swing.GroupLayout.DEFAULT_SIZE, 75, Short.MAX_VALUE) .addComponent(x1_tf)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(y1_tf, javax.swing.GroupLayout.DEFAULT_SIZE, 75, Short.MAX_VALUE) .addComponent(y2_tf)))) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(fromwhat_combobox, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(fracy_tf) .addComponent(fracx_tf))) .addGroup(layout.createSequentialGroup() .addComponent(frac_checkbox) .addGap(0, 254, Short.MAX_VALUE))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(6, 6, 6) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(x1_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(y1_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(fromwhat_combobox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(x2_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(y2_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(fracx_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(calc_button) .addComponent(fracy_tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(frac_checkbox) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 129, Short.MAX_VALUE) .addContainerGap()) ); pack(); }// &lt;/editor-fold&gt; public void cinitComponents() { calc_button.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { calc_buttonAP(evt); } }); frac_checkbox.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { frac_checkboxAP(evt); } }); fracx_tf.setEnabled(false); fracy_tf.setEnabled(false); fromwhat_combobox.setEnabled(false); } public void oinitComponents() { x1_tf.addFocusListener(new java.awt.event.FocusListener() { String DEFAULT_TEXT = "X1"; @Override public void focusGained(FocusEvent e){ String s = x1_tf.getText(); if(s.equals(DEFAULT_TEXT)) { x1_tf.selectAll(); } } @Override public void focusLost(FocusEvent e) { String s = x1_tf.getText(); if(s.length()&lt;=0) { x1_tf.setText("X1"); } } }); y1_tf.addFocusListener(new java.awt.event.FocusListener() { String DEFAULT_TEXT = "Y1"; @Override public void focusGained(FocusEvent e){ String s = y1_tf.getText(); if(s.equals(DEFAULT_TEXT)) { y1_tf.selectAll(); } } @Override public void focusLost(FocusEvent e) { String s = y1_tf.getText(); if(s.length()&lt;=0) { y1_tf.setText("Y1"); } } }); x2_tf.addFocusListener(new java.awt.event.FocusListener() { String DEFAULT_TEXT = "X2"; @Override public void focusGained(FocusEvent e){ String s = x2_tf.getText(); if(s.equals(DEFAULT_TEXT)) { x2_tf.selectAll(); } } @Override public void focusLost(FocusEvent e) { String s = x2_tf.getText(); if(s.length()&lt;=0) { x2_tf.setText("X2"); } } }); y2_tf.addFocusListener(new java.awt.event.FocusListener() { String DEFAULT_TEXT = "Y2"; @Override public void focusGained(FocusEvent e){ String s = y2_tf.getText(); if(s.equals(DEFAULT_TEXT)) { y2_tf.selectAll(); } } @Override public void focusLost(FocusEvent e) { String s = y2_tf.getText(); if(s.length()&lt;=0) { y2_tf.setText("Y2"); } } }); } public static void main(String args[]) { /*Look and feel set to Windows*/ //&lt;editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "&gt; /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Windows".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(DistanceBetweenPointsCALC.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(DistanceBetweenPointsCALC.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(DistanceBetweenPointsCALC.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(DistanceBetweenPointsCALC.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //&lt;/editor-fold&gt; java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new DistanceBetweenPointsCALC().setVisible(true); } }); } // Variables declaration - do not modify public static javax.swing.JButton calc_button; public static javax.swing.JCheckBox frac_checkbox; public static javax.swing.JTextField fracx_tf; public static javax.swing.JTextField fracy_tf; public static javax.swing.JComboBox fromwhat_combobox; public static javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextPane output_pane; public static javax.swing.JTextField x1_tf; public static javax.swing.JTextField x2_tf; public static javax.swing.JTextField y1_tf; public static javax.swing.JTextField y2_tf; // End of variables declaration /** * Action(s) performed below */ public void calc_buttonAP(java.awt.event.ActionEvent evt) { if(frac_checkbox.isSelected()) { try { String a; a = x1_tf.getText().toString(); double x1 = Integer.parseInt(a); a = y1_tf.getText().toString(); double y1 = Integer.parseInt(a); a = x2_tf.getText().toString(); double x2 = Integer.parseInt(a); a = y2_tf.getText().toString(); double y2 = Integer.parseInt(a); double Ax,Ay, x = 0,y = 0,nx,ny,fx = 0,fy = 0; double numerator = Integer.parseInt(fracx_tf.getText().toString()); double denominator = Integer.parseInt(fracy_tf.getText().toString()); if(fromwhat_combobox.getSelectedIndex()==0) { Ax = Integer.parseInt(x1_tf.getText().toString()); Ay = Integer.parseInt(y1_tf.getText().toString()); x += Math.sqrt(Math.pow(Ax, 2)) + Math.sqrt(Math.pow(Ay, 2)); y += Math.sqrt(Math.pow(Ay, 2)) + Math.sqrt(Math.pow(Ax, 2)); //problem lies here ^^^^ } else { Ax = Integer.parseInt(x2_tf.getText().toString()); Ay = Integer.parseInt(y2_tf.getText().toString()); x += Math.sqrt(Math.pow(Ax, 2)) + Math.sqrt(Math.pow(Ay, 2)); y += Math.sqrt(Math.pow(Ay, 2)) + Math.sqrt(Math.pow(Ax, 2)); //problem lies here ^^^^ } nx = (x*numerator)/denominator; ny = (y*numerator)/denominator; fx = Ax + nx; if((y2-y1)/(x2-x1)&gt;=0) { fy = Ay + ny; } else { fy = Ay - ny; } String answer = "("+fx+","+fy+") is "+numerator+"/"+denominator+" way from "; output_pane.setText(answer); }catch(Exception e){} } else if(!frac_checkbox.isSelected()) { try { String a; a = x1_tf.getText().toString(); double x1 = Integer.parseInt(a); a = y1_tf.getText().toString(); double y1 = Integer.parseInt(a); a = x2_tf.getText().toString(); double x2 = Integer.parseInt(a); a = y2_tf.getText().toString(); double y2 = Integer.parseInt(a); double finalAnswer = Math.sqrt(Math.pow((x2-x1),2)+Math.pow((y2-y1),2)); double var1 = x2-x1; double var2 = y2-y1; double var3 = Math.pow(var1, 2); double var4 = Math.pow(var2, 2); double var5 = var3+var4; String answer = "Formula : sqrt( (x2 - x1)^2 + (y2 - y1)^2 )\n" + "sqrt( ("+x2+" - "+x1+")^2 + ("+y2+" - "+y1+")^2 )\n" + "sqrt( ("+var1+")^2 + ("+var2+")^2 )\n" + "sqrt( "+var3+" + "+var4+" )\n" + "sqrt( "+var5+" )\n" + "answer = "+ finalAnswer; output_pane.setText(answer); }catch(Exception e){ e.printStackTrace(); } } } public void frac_checkboxAP(java.awt.event.ActionEvent evt) { if(!frac_checkbox.isSelected()) { fracx_tf.setEnabled(false); fracy_tf.setEnabled(false); fromwhat_combobox.setEnabled(false); } else if(frac_checkbox.isSelected()) { fracx_tf.setEnabled(true); fracy_tf.setEnabled(true); fromwhat_combobox.setEnabled(true); } } /** * EOF */ } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USArc
    1. USArc
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJava and Algebra
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POJava and Algebra
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIt's a much easier problem if you understand something about Euclidean geometry and vectors.
      singulars
      1. POJava and Algebra
      1. USduffymo
    2. CO**what** is the issue?
      singulars
      1. POJava and Algebra
      1. USJeroen Vannevel
    3. COhow is the x and y point determined? I'm not seeing this in your question.
      singulars
      1. POJava and Algebra
      1. USPaul Samsotha
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload