/*
* $Id: gnuplot_svg.js,v 1.8 2011/11/22 22:35:32 sfeam Exp $
*/
// Javascript routines for interaction with SVG documents produced by
// gnuplot's SVG terminal driver.
var gnuplot_svg = { };
gnuplot_svg.version = "22 November 2011";
gnuplot_svg.SVGDoc = null;
gnuplot_svg.SVGRoot = null;
gnuplot_svg.Init = function(e)
{
gnuplot_svg.SVGDoc = e.target.ownerDocument;
gnuplot_svg.SVGRoot = gnuplot_svg.SVGDoc.documentElement;
gnuplot_svg.axisdate = new Date();
}
gnuplot_svg.toggleVisibility = function(evt, targetId)
{
var newTarget = evt.target;
if (targetId)
newTarget = gnuplot_svg.SVGDoc.getElementById(targetId);
var newValue = newTarget.getAttributeNS(null, 'visibility')
if ('hidden' != newValue)
newValue = 'hidden';
else
newValue = 'visible';
newTarget.setAttributeNS(null, 'visibility', newValue);
evt.preventDefault();
evt.stopPropagation();
}
// Mouse tracking echos coordinates to a floating text box
gnuplot_svg.getText = function() {
return(document.getElementById("coord_text"));
}
gnuplot_svg.updateCoordBox = function(t, evt) {
/*
* Apply screen CTM transformation to the evt screenX and screenY to get
* coordinates in SVG coordinate space. Use scaling parameters stored in
* the plot document by gnuplot to convert further into plot coordinates.
* Then position the floating text box using the SVG coordinates.
*/
var m = document.documentElement.getScreenCTM();
var p = document.documentElement.createSVGPoint();
p.x = evt.clientX; p.y = evt.clientY;
p = p.matrixTransform(m.inverse());
// Allow for scrollbar position (Firefox, others?)
if (typeof evt.pageX != 'undefined') {
p.x = evt.pageX; p.y = evt.pageY;
}
t.setAttribute("x", p.x);
t.setAttribute("y", p.y);
plotcoord = gnuplot_svg.mouse2plot(p.x,p.y);
if (gnuplot_svg.polar_mode) {
polar = gnuplot_svg.convert_to_polar(plotcoord.x,plotcoord.y);
label_x = "ang= " + polar.ang.toPrecision(4);
label_y = "R= " + polar.r.toPrecision(4);
} else if (gnuplot_svg.plot_timeaxis_x == "Date") {
gnuplot_svg.axisdate.setTime(1000. * (plotcoord.x + 946684800));
year = gnuplot_svg.axisdate.getUTCFullYear();
month = gnuplot_svg.axisdate.getUTCMonth();
date = gnuplot_svg.axisdate.getUTCDate();
label_x = (" " + date).slice (-2) + "/"
+ ("0" + (month+1)).slice (-2) + "/"
+ year;
label_y = plotcoord.y.toFixed(2);
} else if (gnuplot_svg.plot_timeaxis_x == "Time") {
gnuplot_svg.axisdate.setTime(1000. * (plotcoord.x + 946684800));
hour = gnuplot_svg.axisdate.getUTCHours();
minute = gnuplot_svg.axisdate.getUTCMinutes();
second = gnuplot_svg.axisdate.getUTCSeconds();
label_x = ("0" + hour).slice (-2) + ":"
+ ("0" + minute).slice (-2) + ":"
+ ("0" + second).slice (-2);
label_y = plotcoord.y.toFixed(2);
} else if (gnuplot_svg.plot_timeaxis_x == "DateTime") {
gnuplot_svg.axisdate.setTime(1000. * (plotcoord.x + 946684800));
label_x = gnuplot_svg.axisdate.toUTCString();
label_y = plotcoord.y.toFixed(2);
} else {
label_x = plotcoord.x.toFixed(2);
label_y = plotcoord.y.toFixed(2);
}
while (null != t.firstChild) {
t.removeChild(t.firstChild);
}
var textNode = document.createTextNode(". "+label_x+" "+label_y);
t.appendChild(textNode);
}
gnuplot_svg.showCoordBox = function(evt) {
var t = gnuplot_svg.getText();
if (null != t) {
t.setAttribute("visibility", "visible");
gnuplot_svg.updateCoordBox(t, evt);
}
}
gnuplot_svg.moveCoordBox = function(evt) {
var t = gnuplot_svg.getText();
if (null != t)
gnuplot_svg.updateCoordBox(t, evt);
}
gnuplot_svg.hideCoordBox = function(evt) {
var t = gnuplot_svg.getText();
if (null != t)
t.setAttribute("visibility", "hidden");
}
gnuplot_svg.toggleCoordBox = function(evt) {
var t = gnuplot_svg.getText();
if (null != t) {
state = t.getAttribute('visibility');
if ('hidden' != state)
state = 'hidden';
else
state = 'visible';
t.setAttribute('visibility', state);
}
}
gnuplot_svg.toggleGrid = function() {
if (!gnuplot_svg.SVGDoc.getElementsByClassName) // Old browsers
return;
var grid = gnuplot_svg.SVGDoc.getElementsByClassName('gridline');
for (var i=0; i<grid.length; i++) {
state = grid[i].getAttribute('visibility');
grid[i].setAttribute('visibility', (state == 'hidden') ? 'visible' : 'hidden');
}
}
// Convert from svg panel mouse coordinates to the coordinate
// system of the gnuplot figure
gnuplot_svg.mouse2plot = function(mousex,mousey) {
var plotcoord = new Object;
var plotx = mousex - gnuplot_svg.plot_xmin;
var ploty = mousey - gnuplot_svg.plot_ybot;
if (gnuplot_svg.plot_logaxis_x != 0) {
x = Math.log(gnuplot_svg.plot_axis_xmax)
- Math.log(gnuplot_svg.plot_axis_xmin);
x = x * (plotx / (gnuplot_svg.plot_xmax - gnuplot_svg.plot_xmin))
+ Math.log(gnuplot_svg.plot_axis_xmin);
x = Math.exp(x);
} else {
x = gnuplot_svg.plot_axis_xmin + (plotx / (gnuplot_svg.plot_xmax-gnuplot_svg.plot_xmin)) * (gnuplot_svg.plot_axis_xmax - gnuplot_svg.plot_axis_xmin);
}
if (gnuplot_svg.plot_logaxis_y != 0) {
y = Math.log(gnuplot_svg.plot_axis_ymax)
- Math.log(gnuplot_svg.plot_axis_ymin);
y = y * (ploty / (gnuplot_svg.plot_ytop - gnuplot_svg.plot_ybot))
+ Math.log(gnuplot_svg.plot_axis_ymin);
y = Math.exp(y);
} else {
y = gnuplot_svg.plot_axis_ymin + (ploty / (gnuplot_svg.plot_ytop-gnuplot_svg.plot_ybot)) * (gnuplot_svg.plot_axis_ymax - gnuplot_svg.plot_axis_ymin);
}
plotcoord.x = x;
plotcoord.y = y;
return plotcoord;
}
gnuplot_svg.convert_to_polar = function (x,y)
{
polar = new Object;
var phi, r;
phi = Math.atan2(y,x);
if (gnuplot_svg.plot_logaxis_r)
r = Math.exp( (x/Math.cos(phi) + Math.log(gnuplot_svg.plot_axis_rmin)/Math.LN10) * Math.LN10);
else
r = x/Math.cos(phi) + gnuplot_svg.plot_axis_rmin;
polar.ang = phi * 180./Math.PI;
polar.r = r;
return polar;
}
