Līnijas veidošanas algoritms

2. Programmas kods
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

Graphics g = jPanel1.getGraphics();
int x1 = Integer.parseInt(jTextField1.getText());
int y1 = Integer.parseInt(jTextField2.getText());
int x2 = Integer.parseInt(jTextField3.getText());
int y2 = Integer.parseInt(jTextField4.getText());

int xn = x1;
int yn = y1;
int dx = Math.abs( x2 - x1 );
int dy = Math.abs( y2 - y1 );
int xi,yi;
if ( x2 > x1 ) {xi = 1;} else { xi = -1; }
if ( y2 > y1 ) {yi = 1;} else { yi = -1; }

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