import java.awt.*; import java.applet.*; import java.net.URL; import graph.*; import java.awt.event.*; import java.util.*; /************************************************************************* ** ** Applet example1a ** Version 1.0 January 1996 ** ************************************************************************** ** Copyright (C) 1996 Leigh Brookshaw ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ************************************************************************** ** ** This applet demonstrates derivatives of trig functions The data is calculated locally by ** the applet ** *************************************************************************/ public class difftrig2j extends Applet{ Graph2D graph1; Graph2D graph2; Image osi=null; Image theta; Graphics osg=null; int iwidth = 0; int iheight=0; int yvalue=0; DataSet data1; DataSet data2; DataSet data3; DataSet data4; DataSet data5; DataSet data6; Axis xaxis1; Axis xaxis2; Axis yaxis1; Axis yaxis2; double data[]; double reset[];double reset2[]; int np=2; double rightsin[]; double rightcos[]; double lowersin[]; URL markersURL; Markers markers; Panel panel; Label title; int i; int j; int lx; int ly, ax, jx, jy,a,b, c1,c2, d1, dL; double a1, b1,b2; public void init() { double data[] = new double[2*np]; double rightsin[]=new double[2*361]; double rightcos[]=new double[2*361]; double lowersin[]=new double[2*361]; theta=getImage(getDocumentBase(),"theta.jpg"); String st = getParameter("TITLE"); String mfile = getParameter("MARKERS"); /* ** Create the Graph instance and modify the default behaviour */ graph1 = new Graph2D(); graph1.drawzero =true; graph1.zerocolor=Color.black; graph1.drawgrid = true; graph1.gridcolor=Color.blue; graph1.setDataBackground(new Color(220,220,250)); graph2 = new Graph2D(); graph2.drawzero =true; graph2.zerocolor=Color.black; graph2.drawgrid = true; graph2.gridcolor=Color.blue; graph2.setDataBackground(new Color(220,220,250)); /* ** Build the title */ title = new Label(st, Label.CENTER); title.setFont(new Font("TimesRoman",Font.PLAIN,20)); /* ** Load a file containing Marker definitions */ try { markersURL = new URL(getDocumentBase(),mfile); markers = new Markers(markersURL); } catch(Exception e) { System.out.println("Failed to create Marker URL!"); } graph1.setMarkers(markers); panel = new Panel(); panel.setLayout( new GridLayout(2,1,0,5) ); panel.add(graph1); panel.add(graph2); this.setLayout( new BorderLayout() ); this.add("North", title); this.add("Center", panel); /* ** Calculate the first data Set. */ for(i=j=0; i<361; i++,j+=2) { rightsin[j] = Math.PI*i/180; rightcos[j] =Math.PI*i/180; lowersin[j] =Math.PI*i/180; rightsin[j+1] =Math.sin(Math.PI*i/180); rightcos[j+1] =Math.cos(Math.PI*i/180); lowersin[j+1]= -Math.sin(Math.PI*i/180); } data1 = graph1.loadDataSet(rightsin, 360); data1.linecolor = Color.blue; data1.marker = 0; data1.markercolor = new Color(100,100,255); data2 = graph1.loadDataSet(rightcos, 360); data2.linecolor = Color.magenta; data2.marker = 0; data2.markercolor = new Color(100,100,255); data3 = graph2.loadDataSet(rightcos, 360); data3.linecolor = Color.magenta; data3.marker = 0; data3.markercolor = new Color(100,100,255); data4 = graph2.loadDataSet(lowersin, 360); data4.linecolor = new Color(100,0,200); data4.marker = 0; data4.markercolor = new Color(100,100,255); data[0]=0; data[1]=-0.5; data[2]=0; data[3]=+0.5; data5 = graph1.loadDataSet(data, np); data5.linecolor = Color.black; data5.linestyle = 1; data6 = graph2.loadDataSet(data, np); data6.linecolor = new Color(100,0,200); data6.linestyle = 1; /* ** Attach data sets to the Xaxes */ xaxis1 = graph1.createAxis(Axis.BOTTOM); xaxis1.attachDataSet(data1); xaxis1.attachDataSet(data2); xaxis1.attachDataSet(data5); xaxis1.setTitleText("angle in radians"); xaxis1.setTitleColor( new Color(0,0,255) ); xaxis1.setTitleFont(new Font("TimesRoman",Font.PLAIN,15)); xaxis1.setLabelFont(new Font("Helvetica",Font.PLAIN,15)); xaxis2 = graph2.createAxis(Axis.BOTTOM); xaxis2.attachDataSet(data3); xaxis2.attachDataSet(data4); xaxis2.attachDataSet(data6); xaxis2.setTitleText("angle in radians"); xaxis2.setTitleColor( new Color(0,0,255) ); xaxis2.setTitleFont(new Font("TimesRoman",Font.PLAIN,15)); xaxis2.setLabelFont(new Font("Helvetica",Font.PLAIN,15)); /* ** Attach the first data set to the Left Axis */ yaxis1 = graph1.createAxis(Axis.LEFT); yaxis1.attachDataSet(data1); yaxis1.attachDataSet(data2); yaxis1.attachDataSet(data5); yaxis1.setTitleText(" sine"); yaxis1.setTitleFont(new Font("TimesRoman",Font.PLAIN,15)); yaxis1.setLabelFont(new Font("Helvetica",Font.PLAIN,15)); yaxis1.setTitleColor(Color.blue ); yaxis1.setTitleRotation(90); yaxis2 = graph2.createAxis(Axis.LEFT); yaxis2.attachDataSet(data3); yaxis2.attachDataSet(data4); yaxis2.attachDataSet(data6); yaxis2.setTitleText("cosine"); yaxis2.setTitleFont(new Font("TimesRoman",Font.PLAIN,15)); yaxis2.setLabelFont(new Font("Helvetica",Font.PLAIN,15)); yaxis2.setTitleColor(Color.magenta ); yaxis2.setTitleRotation(90); } public boolean mouseDrag(Event evt, int x, int y) { a=x; b=y; mousie(a, b); return true; } public boolean mouseDown(Event e2, int x, int y) { a=x; b=y; mousie(a, b); return true; } void mousie(int a, int b){ a1=xaxis1.getDouble(a); b1 =Math.sin(a1); b2= Math.cos(a1); double reset[] = new double[2*np]; reset[0]=a1-0.4; reset[1]=b1-0.4*b2; reset[2]=a1+0.4; reset[3]=b1+0.4*b2; data5.delete(0,2); try{ data5.append(reset, 2);} catch (Exception e) { System.out.println("Error appending Data!"); } xaxis1.setManualRange(true); data5.xaxis.minimum=0; data5.xaxis.maximum=6.28; yaxis1.setManualRange(true); data5.yaxis.minimum=-1; data5.yaxis.maximum=1; double reset2[] = new double[2*np]; reset2[0]=a1-0.4; reset2[1]=b2+0.4*b1; reset2[2]=a1+0.4; reset2[3]=b2-0.4*b1; data6.delete(0,2); try{ data6.append(reset2,2);} catch (Exception e) { System.out.println("Error appending Data!"); } data6.xaxis.minimum=0; data6.xaxis.maximum=6.28; yaxis2.setManualRange(true); data6.yaxis.minimum=-1; data6.yaxis.maximum=1; Graphics g; g = graph1.getGraphics(); if( osi == null || iwidth != graph1.size().width || iheight != graph1.size().height ) { iwidth = graph1.size().width; iheight = graph1.size().height; osi = graph1.createImage(iwidth,iheight); osg = osi.getGraphics(); } osg.setColor(this.getBackground()); osg.fillRect(0,0,iwidth,iheight); osg.setColor(g.getColor()); osg.clipRect(0,0,iwidth,iheight); graph1.update(osg); c1=xaxis1.getInteger(a1); jx = yaxis1.getInteger(b1); osg.setColor(Color.black); int mx[]={xaxis1.getInteger(reset[0]), xaxis1.getInteger(reset[2]), xaxis1.getInteger(reset[2]),xaxis1.getInteger(reset[0]), xaxis1.getInteger(reset[0]) }; int my[]={yaxis1.getInteger(reset[1]),yaxis1.getInteger(reset[3]), 2+yaxis1.getInteger(reset[3]), 2+yaxis1.getInteger(reset[1]),yaxis1.getInteger(reset[1]) }; Polygon polyx=new Polygon(mx,my, 5); osg.fillPolygon(polyx); osg.setColor(Color.blue); osg.fillOval(c1-5,jx-5,10,10); jy= yaxis1.getInteger(b2); osg.setColor(Color.magenta); osg.fillOval(c1-5,jy-5,10,10); osg.drawString(" d(sin(x))/dx = cos(x)", xaxis1.getInteger(0),yaxis1.getInteger(1.1)); g.drawImage(osi,0,0,graph1); g = graph2.getGraphics(); if( osi == null || iwidth != graph2.size().width || iheight != graph2.size().height ) { iwidth = graph2.size().width; iheight = graph2.size().height; osi = graph2.createImage(iwidth,iheight); osg = osi.getGraphics(); } osg.setColor(this.getBackground()); osg.fillRect(0,0,iwidth,iheight); osg.setColor(g.getColor()); osg.clipRect(0,0,iwidth,iheight); graph2.update(osg); c2=xaxis2.getInteger(a1); jx = yaxis2.getInteger(b2); osg.setColor(Color.black); int lx[]={xaxis2.getInteger(reset2[0]), xaxis2.getInteger(reset2[2]), xaxis2.getInteger(reset2[2]),xaxis2.getInteger(reset2[0]), xaxis2.getInteger(reset2[0]) }; int ly[]={yaxis2.getInteger(reset2[1]),yaxis2.getInteger(reset2[3]), 2+yaxis2.getInteger(reset2[3]), 2+yaxis2.getInteger(reset2[1]),yaxis2.getInteger(reset2[1]) }; Polygon poly=new Polygon(lx,ly, 5); osg.fillPolygon(poly); osg.setColor(Color.magenta); osg.fillOval(c1-5,jy-5,10,10); jy= yaxis2.getInteger(-b1); osg.setColor(new Color(100,0,200)); osg.fillOval(c2-5,jy-5,10,10); osg.drawString(" d(cos(x))/dx = -sin(x)", xaxis2.getInteger(4.5),yaxis2.getInteger(1.1)); g.drawImage(osi,0,0,graph2); } public void update(Graphics screen){ paint(screen); } }