/* Program to display coordinates of handwriting and apply a time delay shift interactively to show effects of roundness manipulation. The XY coordinates are loaded via a URL. Copyright, Lambert Schomaker/NICI, March 1996. Please, refer to the author when using this code by: Schomaker, L.R.B. (1993). Using Stroke- or Character-based Self-organiZg Maps in the Recognition of On-line, Connected Cursive Script. {\em Pattern Recognition}, 26(3), 443-450. Schomaker, L.R.B., & Teulings, H.-L. (1990). A Handwriting Recognition System based on the Properties and Architectures of the Human Motor System. {\em Proceedings of the International Workshop on Frontiers in Handwriting Recognition (IWFHR)}. (pp. 195-211). Montreal: CENPARMI Concordia. */ import java.awt.*; import java.applet.*; /* * Can be run either as a standalone application by * typing "java hwround" or as an applet in the AppletViewer. */ public class hwround extends Applet { HwrRoundControls controls; public void init() { setLayout(new BorderLayout()); HwrRoundCanvas c = new HwrRoundCanvas(); add("Center", c); add("South", controls = new HwrRoundControls(c)); c.H = new hwrCoord(4); c.update(); } public void start() { controls.enable(); } public void stop() { controls.disable(); } public boolean handleEvent(Event e) { if (e.id == Event.WINDOW_DESTROY) { System.exit(0); } return false; } public static void main(String args[]) { Frame f = new Frame("hwround"); hwround hwrRound = new hwround(); hwrRound.init(); hwrRound.start(); f.add("Center", hwrRound); f.resize(500, 300); f.show(); } } class HwrRoundCanvas extends Canvas { /* begin object attributes */ double delay = 0.; Font font; double xmin, ymin, xmax, ymax, xoff, yoff, xscale, yscale; double box_xmargin = 0.05; /* LR symmetrical of graphbox on canvas */ double box_ymargin = 0.1; /* bottom margin of graphbox on canvas */ double hwrmargin = 0.02; /* all sides within graphics box */ double xpix, ypix, wpix, hpix; int npoints; hwrCoord H; double xarr[]; double yarr[]; double zarr[]; TextField txt_delay; /* end object attributes */ /* actual curve stuff */ public void update() { xarr = new double [H.Npoints]; yarr = new double [H.Npoints]; zarr = new double [H.Npoints]; } public void calc(double delay_ms) { int i, k; int ist, iend; double delay, t; delay = delay_ms / 10.; if(delay >= 0.0) { ist = (int) delay + 1; iend = H.Npoints - 1; } else { ist = 1; iend = (H.Npoints - 5 -1); } k = 0; for(i = ist; i < iend; ++i) { t = (double) i; xarr[k] = 0.33 * f(H.X, t-delay-1., H.Npoints) + 0.33 * f(H.X, t-delay, H.Npoints) + 0.33 * f(H.X, t-delay+1., H.Npoints); yarr[k] = 0.33 * f(H.Y, t - 1., H.Npoints) + 0.33 * f(H.Y, t, H.Npoints) + 0.33 * f(H.Y, t + 1., H.Npoints); zarr[k] = H.Z[i]; ++k; } npoints = k; } private double f(double r[], double t, int n) { double ret_val, d; int i1, i2; if(t <= 0) { ret_val = r[0]; } else if(t >= n-1) { ret_val = r[n-1]; } else { i1 = (int) t; i2 = i1 + 1; d = t - (double) i1; ret_val = (1.-d) * r[i1] + d * r[i2]; } return(ret_val); } private double rmean(double a[], int n) { int i; double sum; sum = 0.0; for(i = 0; i < n; ++i) { sum += a[i]; } return(sum/(double) n); } void scalexyz(Rectangle box) { int kk; xmin = xmax = xarr[0]; ymin = ymax = yarr[0]; for(kk = 1; kk < npoints; ++kk) { if( xarr[kk] < xmin) { xmin = xarr[kk]; } if( yarr[kk] < ymin) { ymin = yarr[kk]; } if( xarr[kk] > xmax) { xmax = xarr[kk]; } if( yarr[kk] > ymax) { ymax = yarr[kk]; } ++kk; } double xscale_in; double yscale_in; xscale_in = xmax - xmin; yscale_in = ymax - ymin; if(wpix/xscale_in > hpix/yscale_in) { yscale = yscale_in / (1.- box_ymargin - 2. * hwrmargin); xscale = wpix/hpix * yscale; } else { xscale = xscale_in / (1.- 2. * (box_xmargin + hwrmargin)); yscale = hpix/wpix * xscale; } xoff = (xmax + xmin)/ 2.0; yoff = (ymax + ymin)/ 2.0; } public void paint(Graphics g) { Rectangle r = bounds(); g.setColor(Color.black); g.setFont(font); drawbox(g, r); calc(delay); scalexyz(r); drawxyz(g); g.drawString(H.Inkfilename, (int) xpix , (int) (ypix + hpix + 18.)); } void drawbox(Graphics g, Rectangle box) /* init and draw graphics box */ { int x1,y1,x2,y2; /* Around 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); /* Around 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); } void drawxyz(Graphics g) { for (int i = 1; i < (npoints - 1) ; i++) { if(zarr[i+1] > 0 && zarr[i] > 0) { g.drawLine(scalex(xarr[i]), scaley(yarr[i]) , scalex(xarr[i + 1]), scaley(yarr[i+1])); } else { g.drawLine(scalex(xarr[i + 1]), scaley(yarr[i+1]), scalex(xarr[i + 1]), scaley(yarr[i+1])); } } } int scalex(double r) { double rr; rr = xpix + 0.5 * wpix + wpix * (r - xoff)/xscale; return((int) rr); } int scaley(double r) { double rr; rr = ypix + hpix * (0.5 - (r - yoff)/yscale); return((int) rr); } public void redraw(Double delay) { this.delay = delay.doubleValue(); if(this.delay < -30.) { this.delay = -30.; } if(this.delay > 30.) { this.delay = 30.; } txt_delay.setText(Double.toString(this.delay)); repaint(); } } class HwrRoundControls extends Panel { HwrRoundCanvas canvas; Scrollbar delay_slider; protected void makebutton(String name, GridBagLayout gridbag, GridBagConstraints c) { Button button = new Button(name); gridbag.setConstraints(button, c); add(button); } public HwrRoundControls(HwrRoundCanvas canvas) { this.canvas = canvas; GridBagLayout gridbag = new GridBagLayout(); GridBagConstraints rules = new GridBagConstraints(); setLayout(gridbag); rules.fill = GridBagConstraints.BOTH; rules.weightx = 1.0; delay_slider = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, -30, 30); gridbag.setConstraints(delay_slider, rules); add(delay_slider); rules.weightx = 0.0; this.canvas.txt_delay = new TextField(Double.toString(this.canvas.delay), 6); gridbag.setConstraints(this.canvas.txt_delay, rules); add(this.canvas.txt_delay); makebutton("Apply", gridbag, rules); makebutton("Previous", gridbag, rules); makebutton("Next", gridbag, rules); } public boolean handleEvent(Event ev) { if (ev.target instanceof Scrollbar) { this.canvas.delay = (double) delay_slider.getValue(); this.canvas.txt_delay.setText(Double.toString(this.canvas.delay)); canvas.redraw( Double.valueOf(this.canvas.txt_delay.getText().trim()) ); return true; } if (ev.target instanceof Button) { int idum; if ( "Next".equals(ev.arg) ) { idum = this.canvas.H.next(); this.canvas.update(); } if ( "Previous".equals(ev.arg) ) { idum = this.canvas.H.previous(); this.canvas.update(); } canvas.redraw( Double.valueOf(this.canvas.txt_delay.getText().trim()) ); return true; } return false; } }