// -------------------------------------------- // PROGRAM : SINPLOT.JAVA // -------------------------------------------- // I wrote this program while playing around // with math and graphics methods. // No 3D correction is considered. Thus, the // curves seem to be distorted in 3D space. // -------------------------------------------- // AUTHOR : Andre Maier // -------------------------------------------- import java.applet.Applet; import java.awt.event.*; import java.awt.*; public class sinplot extends Applet implements AdjustmentListener, ItemListener { // Declaration of variables double i,j1,j2,cd; int x1,x2,y1,y2; int a,b,c; int old_x1, old_x2, old_y1, old_y2; String Function1, Function2; Scrollbar slider1, slider2, slider3; Label label1, label2, label3, label4; Choice curve1; Choice curve2; // The paint method will calculate and // plot the functions. public void paint(Graphics g) { cd = c/300.0; old_x1 = 0; old_x2 = 0; old_y1 = 0; old_y2 = 0; for(i=0;i<(6.28);i=i+0.001+cd) { if(Function1=="SINUS") { j1 = 50*(Math.sin(i)); } if(Function1=="COSINUS") { j1 = 50*(Math.cos(i)); } if(Function1=="ZERO") { j1 = 0; } if(Function1=="TANGENS") { j1 = 2*(Math.tan(i)); // Maximum value of TAN is limited to 50 if(j1>50.0) { j1 = 50.0; } if(j1<-50.0) { j1 = -50.0; } } if(Function1=="RANDOM") { j1 = 50*Math.random(); } if(Function2=="SINUS") { j2 = 50*(Math.sin(i)); } if(Function2=="COSINUS") { j2 = 50*(Math.cos(i)); } if(Function2=="ZERO") { j2 = 0; } if(Function2=="TANGENS") { j2 = 2*(Math.tan(i)); // Maximum value of TAN is limited to 50 if(j2>50.0) { j2 = 50.0; } if(j2<-50.0) { j2 = -50.0; } } if(Function2=="RANDOM") { j2 = 50*Math.random(); } // Here the calculated values are scaled and // rounded to get integer values. x1 = (int) Math.round(i*((300+120)/6.28)); y1 = (int) Math.round(j1); x2 = (int) Math.round(i*(500/6.28)); y2 = (int) Math.round(j2); // Now we plot the functions and draw lines // connecting each calculated dot. g.drawLine(x1+200-a,y1+100+b,x2+a,y2+400-b); if(i>0) { g.drawLine(old_x1+200-a,old_y1+100+b,x1+200-a,y1+100+b); g.drawLine(old_x2+a,old_y2+400-b,x2+a,y2+400-b); } old_x1 = x1; old_y1 = y1; old_x2 = x2; old_y2 = y2; } } // Event Handling public void adjustmentValueChanged(AdjustmentEvent e) { if(e.getAdjustable()==slider1) { label1.setText("a = " + String.valueOf(slider1.getValue())); a = slider1.getValue(); repaint(); } if(e.getAdjustable()==slider2) { label2.setText("b = " + String.valueOf(slider2.getValue())); b = slider2.getValue(); repaint(); } if(e.getAdjustable()==slider3) { label3.setText("c = " + String.valueOf(slider3.getValue())); c = slider3.getValue(); repaint(); } } public void itemStateChanged(ItemEvent e) { if(e.getItem()=="1:SINUS") { Function1 = "SINUS"; repaint(); } if(e.getItem()=="1:COSINUS") { Function1 = "COSINUS"; repaint(); } if(e.getItem()=="1:ZERO") { Function1 = "ZERO"; repaint(); } if(e.getItem()=="1:TANGENS") { Function1 = "TANGENS"; repaint(); } if(e.getItem()=="1:RANDOM") { Function1 = "RANDOM"; repaint(); } if(e.getItem()=="2:SINUS") { Function2 = "SINUS"; repaint(); } if(e.getItem()=="2:COSINUS") { Function2 = "COSINUS"; repaint(); } if(e.getItem()=="2:ZERO") { Function2 = "ZERO"; repaint(); } if(e.getItem()=="2:TANGENS") { Function2 = "TANGENS"; repaint(); } if(e.getItem()=="2:RANDOM") { Function2 = "RANDOM"; repaint(); } } // This is the point where our program starts public void init() { // Default values a = 190; b = 20; c = 30; Function1 = "SINUS"; Function2 = "SINUS"; // Some values for the Applet this.setBackground(new Color(0,0,0)); this.setForeground(new Color(0,255,255)); this.setLayout(null); // *** SCROLLBARS *** slider1 = new Scrollbar(Scrollbar.HORIZONTAL); slider2 = new Scrollbar(Scrollbar.HORIZONTAL); slider3 = new Scrollbar(Scrollbar.HORIZONTAL); slider1.setValues(0,10,0,200); slider2.setValues(0,10,0,200); slider3.setValues(0,10,0,200); slider1.setBounds(new Rectangle(0,0,200,15)); slider2.setBounds(new Rectangle(0,15,200,15)); slider3.setBounds(new Rectangle(0,30,200,15)); slider1.setBackground(new Color(150,150,150)); slider2.setBackground(new Color(150,150,150)); slider3.setBackground(new Color(150,150,150)); slider1.addAdjustmentListener(this); slider2.addAdjustmentListener(this); slider3.addAdjustmentListener(this); slider1.setValue(a); slider2.setValue(b); slider3.setValue(c); this.add(slider1); this.add(slider2); this.add(slider3); // *** LABELS *** label1 = new Label(""); label2 = new Label(""); label3 = new Label(""); label4 = new Label("SINEPLOT (c)2000 by Andre Maier"); label1.setBounds(new Rectangle(220,0,50,15)); label2.setBounds(new Rectangle(220,15,50,15)); label3.setBounds(new Rectangle(220,30,50,15)); label4.setBounds(new Rectangle(410,460,300,15)); label1.setForeground(new Color(255,255,0)); label2.setForeground(new Color(255,255,0)); label3.setForeground(new Color(255,255,0)); label4.setForeground(new Color(255,255,255)); this.add(label1); this.add(label2); this.add(label3); this.add(label4); label1.setText("a = " + a); label2.setText("b = " + b); label3.setText("c = " + c); // *** CHOICES *** curve1 = new Choice(); curve2 = new Choice(); curve1.add("1:SINUS"); curve1.add("1:COSINUS"); curve1.add("1:ZERO"); curve1.add("1:TANGENS"); curve1.add("1:RANDOM"); curve2.add("2:SINUS"); curve2.add("2:COSINUS"); curve2.add("2:ZERO"); curve2.add("2:TANGENS"); curve2.add("2:RANDOM"); curve1.setBounds(300,0,100,15); curve2.setBounds(400,0,100,15); curve1.setBackground(new Color(150,150,150)); curve2.setBackground(new Color(150,150,150)); curve1.setForeground(Color.black); curve2.setForeground(Color.black); curve1.addItemListener(this); curve2.addItemListener(this); this.add(curve1); this.add(curve2); } public void destroy() { } public String getAppletInfo() { return "This Applet was written by Andre Maier"; } }