import java.awt.*; import java.applet.*; /* * Can be run either as a standalone application by * typing "java hwrveloc" or as an applet in the AppletViewer. */ class hwrVelocCanvas extends Canvas { /* begin object attributes */ public Event ev_changed = new Event(this, Event.ACTION_EVENT,"VelocEvent"); public Event ev_cursor = new Event(this, Event.ACTION_EVENT,"CursorEvent"); public Event ev_minima = new Event(this, Event.ACTION_EVENT,"MinimaEvent"); Font Font; double Vmax; double Box_xmargin = 0.05; /* LR symmetrical of graphbox on canvas */ double Box_ymargin = 0.15; /* bottom margin of graphbox on canvas */ double Hwrmargin = 0.02; /* all sides within graphics box */ double Xpix, Ypix, Wpix, Hpix; int Cursor = -1; hwrCoord H; double Time[]; double Vabs[]; int Npoints; boolean ShowMinima = false; boolean oldShowMinima = !ShowMinima; /* end object attributes */ public void calc() { double dx, dy; Npoints = H.Npoints; Time = new double [H.Npoints]; Vabs = new double [H.Npoints]; H.Vbs.Nsegm = 0; for(int i = 1; i < Npoints; ++i) { Time[i] = (double) i-1; dx = H.X[i] - H.X[i-1]; dy = H.Y[i] - H.Y[i-1]; Vabs[i] = Math.sqrt(dx*dx + dy*dy); } Vabs[0] = Vabs[1]; Time[0] = (double) 0; if(ShowMinima) { calc_vbs(); } else { H.Vbs.Nsegm = 0; } // if(ShowMinima != oldShowMinima) { deliverEvent(ev_minima); // oldShowMinima = ShowMinima; // } } private void calc_vbs() { H.Vbs.Nsegm = 0; if(Vabs[0] < Vabs[1]) { H.Vbs.t[0] = 0; ++H.Vbs.Nsegm; } for(int i = 2; i < Npoints - 2; ++i) { if((Vabs[i] <= Vabs[i-2] && Vabs[i] <= Vabs[i-1] && Vabs[i] < Vabs[i+1] && Vabs[i] < Vabs[i+2]) || (Vabs[i] < Vabs[i-2] && Vabs[i] < Vabs[i-1] && Vabs[i] <= Vabs[i+1] && Vabs[i] <= Vabs[i+2]) ) { H.Vbs.t[H.Vbs.Nsegm] = i; ++H.Vbs.Nsegm; } } if(Vabs[Npoints - 1] < Vabs[Npoints - 2]) { H.Vbs.t[H.Vbs.Nsegm] = 0; ++H.Vbs.Nsegm; } } void scale() { int kk; Vmax = Vabs[0]; for(kk = 1; kk < Npoints; ++kk) { if( Vabs[kk] > Vmax) { Vmax = Vabs[kk]; } } } public void paint(Graphics g) { init(g); calc(); scale(); draw(g); annot(g); } public void annot(Graphics g) { g.drawString("V(t)", 2, (int) (Ypix + Hpix/2.)); g.drawString("t", (int) (Xpix + Wpix/2), (int) (Ypix + Hpix + 18.)); /* arrow */ g.drawLine((int) (Xpix + Wpix/2) + 10, (int) (Ypix + Hpix + 14.) , (int) (Xpix + Wpix/2) + 30, (int) (Ypix + Hpix + 14.)); g.drawLine((int) (Xpix + Wpix/2) + 30, (int) (Ypix + Hpix + 14.) , (int) (Xpix + Wpix/2) + 27, (int) (Ypix + Hpix + 11.)); g.drawLine((int) (Xpix + Wpix/2) + 30, (int) (Ypix + Hpix + 14.) , (int) (Xpix + Wpix/2) + 27, (int) (Ypix + Hpix + 17.)); /* ms */ g.drawLine(scalex(Npoints - 15), (int) (Ypix + Hpix + 4.) , scalex(Npoints-5), (int) (Ypix + Hpix + 4.)); g.drawLine(scalex(Npoints - 15), (int) (Ypix + Hpix + 2.) , scalex(Npoints - 15), (int) (Ypix + Hpix + 4.)); g.drawLine(scalex(Npoints - 5), (int) (Ypix + Hpix + 2.) , scalex(Npoints - 5), (int) (Ypix + Hpix + 4.)); g.drawString("100 ms", scalex(Npoints - 22), (int) (Ypix + Hpix + 18.)); g.drawString("Velocity of " + H.Inkfilename , (int) Xpix, bounds().height - 4); } void init(Graphics g) /* init and draw graphics box */ { int x1,y1,x2,y2; Rectangle box = bounds(); g.setColor(Color.black); g.setFont(Font); /* canvas */ x1 = 0; /* is left */ y1 = 0; /* is top */ x2 = box.width - 1; y2 = box.height - 1; g.drawLine(x1, y1, x1, y2 ); g.drawLine(x1, y2, x2, y2); g.drawLine(x2, y2, x2, y1); g.drawLine(x2, y1, x1, y1); /* graphics area */ x1 = (int) (Box_xmargin * box.width); y1 = (int) (0.04 * box.height); /* is top */ x2 = (int) ((1. - Box_xmargin) * box.width); y2 = (int) ((1. - Box_ymargin) * box.height); g.drawLine(x1, y1, x1, y2 ); g.drawLine(x1, y2, x2, y2); g.drawLine(x2, y2, x2, y1); g.drawLine(x2, y1, x1, y1); /* Remember that this is the graphics box */ Xpix = x1; Ypix = y1; Wpix = x2 - x1 + 1; Hpix = y2 - y1 + 1; g.setColor(Color.blue); } private void draw(Graphics g) { for (int i = 1; i < (Npoints - 1); i++) { g.drawLine(scalex(Time[i]), scaley(Vabs[i]) , scalex(Time[i+1]), scaley(Vabs[i+1])); } if(Cursor >= 0 && Cursor < Npoints) { Color now = g.getColor(); g.setColor(Color.red); g.fillArc(scalex(Time[Cursor])-4 ,scaley(Vabs[Cursor])-4, 8, 8, 0, 360); g.setColor(now); } if(H.Vbs.Nsegm > 0 && ShowMinima == true) { Color now = g.getColor(); g.setColor(Color.green); for (int i = 0; i < H.Vbs.Nsegm; i++) { g.fillArc(scalex(Time[H.Vbs.t[i]])-3 ,scaley(Vabs[H.Vbs.t[i]])-3, 6, 6, 0, 360); } g.setColor(now); } } private int scalex(double r) { return((int) (Xpix + Wpix * r / (double) Npoints)); } private int scaley(double r) { return((int) (Ypix + (Hpix-1.) * ( 1. - 0.95 * r/Vmax))); } public void redraw() { repaint(); deliverEvent(ev_changed); } public boolean mouseDown(Event e, int nx, int ny) { Cursor = (int) ((double) Npoints * (double) (nx - Xpix)/ (double) Wpix + 0.5); repaint(); deliverEvent(ev_cursor); return true; } public boolean mouseDrag(Event e, int nx, int ny) { Cursor = (int) ((double) Npoints * (double) (nx - Xpix)/ (double) Wpix + 0.5); repaint(); deliverEvent(ev_cursor); return true; } } class hwrVelocControls extends Panel { hwrVelocCanvas canvas; Scrollbar Boxcarwidth_slider; public hwrVelocControls(hwrVelocCanvas canvas) { this.canvas = canvas; add(new Button("Minima")); } public boolean handleEvent(Event ev) { if (ev.target instanceof Scrollbar) { canvas.redraw(); return true; } if (ev.target instanceof Button) { if(this.canvas.ShowMinima == true) { this.canvas.ShowMinima = false; } else { this.canvas.ShowMinima = true; } canvas.redraw(); return true; } return false; } } class hwrVelocPanel extends Panel { hwrVelocControls controls; hwrVelocCanvas canvas; public hwrVelocPanel() { canvas = new hwrVelocCanvas(); controls = new hwrVelocControls(canvas); this.setLayout(new BorderLayout()); add("Center",canvas); add("South", controls); } public boolean handleEvent(Event ev) { return false; } } /* end hwrveloc.java */