first off let me thank you for your hard work on your time lapse preset for Papywizard. Time Lapse is the primary reason why I built my rig and am hoping more people get involved in writing something to help us non-programers out here.
Here is a link to a short video I made using the Skywatcher (Merlin/Orion) for timelapse:
I would love more control on the duration and number of shots as well as the number of key points or control points along both axis. The ability to speed up or slow down the number of frames between key points is of real interest and the ablity to run memorized key points at a faster speed without firing the shutter of even more interest (for overlaying time lapse and real time video - first pick the path and then shoot the time lapse then repeat the path in faster speed in video mode for the Canon 7D or a video camera then overlay both in an editor for cool effect).
The only confusing point I had with your layout was the lables for Yaw and Pitch as both begin with "P." I am not a programer at all but I dove in and played around with your preset looking to see what I could and of coursre the whole thing crashed.
<!--
! This program is to generate preset for the Papywizard
! program. This program can be used for commercial and/or
! non-commercial use for free.
!
! Author: Jones Henry Subbiah (C) 2010.
!
! Disclaimer: The user assumes the responsibility of any
! any demage using the preset. The author is not responsible
! for anything.
!
! The name of the preset will be
! TL_35<crop factor>_<focal length>_<# of points>_<fps>_<# of shots>.
!
! History of changes:
! ====================
! 0.1 Initial public version
!
-->
<html>
<head>
<title>Papywizard 6 point Time Lapse (Bezier Curve) Preset Generator</title>
<script language="Javascript">
var FOV_IN_SECS = 7;
var DEBUG = false;
var pval = '';
var crop_factor = '';
var focal_length = 0;
var fps = 30;
/*
* This function appends the message to the text box.
*/
function write ( message )
{
pval += message + "\n";
}
/*
* This function appends debug messages to the text box.
*/
function debug ( message )
{
if ( DEBUG )
write ( message );
}
/*
* Find the factorial value of a given number.
*/
function factorial(num)
{
var ctr = 0;
var result = 1;
if ( num != 0 )
for ( ctr = 1; ctr <= num; ctr++ )
result *= ctr;
return ( result );
}
/*
* Define a Point objecct
*/
function Point()
{
var x = 0.0;
var y = 0.0;
this.getYaw = function() { return x; }
this.setYaw = function(yaw) { x = yaw; }
this.getPitch = function() { return y; }
this.setPitch = function(pitch) { y = pitch; }
this.print = function() { debug ( "x: " + round24 ( x ) + ", y: " + round24 ( y ) ); }
}
/*
* Calculate the output points.
* Returns an array of Point objects.
*/
function bcurve ( points, steps )
{
var npoints = points.length;
var inc = 0.0;
var x = 0.0;
var y = 0.0;
var poly = 0.0;
var outpoints = new Array();
debug ( "bcurve - npoints: " + npoints );
debug ( "bcurve - steps: " + steps );
for ( var ctr2 = 0; ctr2 < steps; ctr2++ )
{
inc = 1.0 * ctr2 / steps;
x = 0.0;
y = 0.0;
for ( var ctr = 0; ctr < npoints; ctr++ )
{
poly = bpoly ( npoints - 1, ctr, inc );
x += poly * points [ ctr ].getYaw();
y += poly * points [ ctr ].getPitch();
}
p = new Point();
p.setYaw ( x );
p.setPitch ( y );
outpoints.push ( p );
}
debug ( "bcurve - outpoints.length: " + outpoints.length );
return ( outpoints );
}
/*
* Calculate the Bezier coefficient.
*/
function bcoeff ( order, pos )
{
return factorial ( order ) / ( factorial ( pos ) * factorial ( order - pos ) );
}
/*
* Calculate the Bezier polynomials.
*/
function bpoly ( order, pos, inc )
{
return bcoeff ( order, pos ) * Math.pow ( inc, pos ) * Math.pow ( ( 1.0 - inc ), ( order - pos ) );
}
/*
* Finds a minimal number of steps needed for the given lens.
* It assumes the FOV of the lens should be scanned in 7 seconds
* for a smooth movement.
*/
function findsteps ( points )
{
debug ( "findsteps - points.length: " + points.length );
var steps = 0;
var lst = new Array();
focal_length = parseFloat ( document.main.fl.value );
var sfa = ( document.main.sf.options[document.main.sf.selectedIndex].value ).split ( ',' );
crop_factor = Number ( sfa[0] );
var source_frame_width = Number ( sfa[1] );
var source_frame_height = Number ( sfa[2] );
var thfov = calculate_fov ( source_frame_width, focal_length );
var tvfov = calculate_fov ( source_frame_height, focal_length );
debug ( "findsteps - focal_length: " + focal_length );
debug ( "findsteps - crop_factor: " + crop_factor );
debug ( "findsteps - source_frame_width: " + source_frame_width );
debug ( "findsteps - source_frame_height: " + source_frame_height );
debug ( "findsteps - thfov: " + thfov );
debug ( "findsteps - tvfov: " + tvfov );
var fov = Math.min ( thfov, tvfov );
fps = parseInt ( document.main.ofps.options[document.main.ofps.selectedIndex].value );
var fov_per_step = fov / ( FOV_IN_SECS * fps );
debug ( "findsteps - fov: " + fov );
debug ( "findsteps - fps: " + fps );
debug ( "findsteps - fov_per_step: " + fov_per_step );
while ( 1 )
{
steps += 30;
lst = bcurve ( points, steps );
debug ( "findsteps - lst.length: " + lst.length );
debug ( "findsteps - steps: " + steps
+ ", lst[1].yaw: " + lst[1].getYaw() + ", lst[0].yaw: " + lst[0].getYaw()
+ ", diff: " + Math.abs ( lst[1].getYaw() - lst[0].getYaw() ) );
if ( Math.abs ( lst[1].getYaw() - lst[0].getYaw() ) < fov_per_step )
{
break;
}
}
debug ( "findsteps - steps: " + steps );
return ( steps );
}
/*
* This function calculates the angular field of view.
*/
function calculate_fov ( frame_length, focal_length )
{
return ( 2 * Math.atan ( frame_length / ( 2 * focal_length ) ) * 180 / Math.PI );
}
/*
* This function validates the input.
* Input validation is done only for text box fields.
*/
function validate_input()
{
if ( isNaN ( parseInt ( document.main.np.value ) ) )
{
alert ( "Enter a valid value for number of shots" );
document.main.np.select();
document.main.np.focus();
return false;
}
return true;
}
/*
* This function rounds a number to a four decimal precision.
* The trick to is to add 0.00005 to the number and truncate at the first
* decimal position.
*/
function round24 ( number )
{
nnum = number + 0.00005;
nums = nnum.toString();
numa = nums.split('.');
return ( numa[0] + '.' + numa[1].substring(0,4) );
}
/*
* Reads the input from the text fields.
*/
function read_point ( pname )
{
debug ( "read_point - pname: " + pname );
var yaw = document.getElementsByName(pname + "x")[0].value;
debug ( "read_point - yaw: " + yaw );
var pitch = document.getElementsByName(pname + "y")[0].value;
debug ( "read_point - pitch: " + pitch );
if ( yaw != '' && pitch != '' )
{
p = new Point();
y.setYaw ( yaw );
p.setPitch ( pitch );
return ( p );
}
return ( null );
}
/*
* This function is the main function that creates the full preset XML.
*/
function do_tl()
{
pval = '';
var pts = new Array();
for ( ctr = 0; ctr < 6; ctr++ )
{
p = read_point ( "p" + ( ctr + 1 ) );
if ( p != null )
{
pts.push ( p );
}
}
if ( pts.length < 2 )
{
alert ( "Plese enter the yaw, pitch values for at least two control points" );
return;
}
var steps = findsteps ( pts );
debug ( "steps: " + steps );
bpts = bcurve ( pts, steps );
for ( ctr = 0; ctr < bpts.length; ctr++ )
{
bpts[ctr].print();
}
write ( '<?xml version="1.0" encoding="utf-8"?>\n' );
write ( '<papywizard>\n' );
write ( ' <preset name="TL_35' + ( crop_factor * 10 ) + '_' + focal_length + '_' + pts.length + 'points_' + fps + 'fps_' + steps + 'shots">' );
write ( ' <tooltip>' );
write ( ' This time lapse preset is generated for the following ' + pts.length + ' control points.' );
for ( var ctr = 0; ctr < pts.length; ctr++ )
{
write ( ' Point' + ( ctr + 1 ) + '(' + pts[ctr].getYaw() + ',' + pts[ctr].getPitch() + ')' );
}
write ( ' ' + steps + ' shots will be taken using this preset' );
write ( ' </tooltip>' );
write ( ' <shoot>' );
for ( ctr = 0; ctr < bpts.length; ctr++ )
{
write ( ' <pict yaw="' + round24 ( bpts[ctr].getYaw() ) + '" pitch="' + round24 ( bpts[ctr].getPitch() ) + '"/>' );
}
write ( ' </shoot>' );
write ( ' </preset>\n' );
write ( '</papywizard>' );
document.main.preset.value = pval;
}
</script>
</head>
<body onload="document.main.preset.value = '';" bgcolor="#cccccc">
<form name="main">
<table border="0" cellspacing="2" cellpadding="2" width="700">
<tr>
<td>Crop Factor</td>
<td>
<select name="sf" style="width:100px">
<option value="1.0,36.0,24.0">35mm(1.0 Crop)</option>
<option value="1.3,27.7,18.5">35mm(1.3 Crop)</option>
<option value="1.5,24.0,16.0">35mm(1.5 Crop)</option>
<option value="1.6,22.5,15.0" selected>35mm(1.6 Crop)</option>
<option value="1.7,21.2,14.1">35mm(1.7 Crop)</option>
<option value="1.8,20.0,13.3">35mm(1.8 Crop)</option>
<option value="2.0,18.0,12.0">35mm(2.0 Crop)</option>
</select>
</td>
<td>Focal Length</td>
<td>
<input type="text" name="fl" style="width:100px" value="150">
</td>
<td>Output FPS</td>
<td>
<select name="ofps" style="width:100px">
<option value="24">24 fps</option>
<option value="25">25 fps</option>
<option value="30" selected>30 fps</option>
<option value="50">50 fps</option>
<option value="60">60 fps</option>
<option value="120">120 fps</option>
</select>
</td>
</tr>
<tr>
<td>
Y1(yaw)
<input type="text" name="y1x" value="" style="width:60px">
</td>
<td>
P1(pitch)
<input type="text" name="p1y" value="" style="width:60px">
</td>
<td>
Y2(yaw)
<input type="text" name="y2x" value="" style="width:60px">
</td>
<td>
P2(pitch)
<input type="text" name="p2y" value="" style="width:60px">
</td>
<td>
Y3(yaw)
<input type="text" name="y3x" value="" style="width:60px">
</td>
<td>
P3(pitch)
<input type="text" name="p3y" value="" style="width:60px">
</td>
</tr>
<tr>
<td>
Y4(yaw)
<input type="text" name="y4x" value="" style="width:60px">
</td>
<td>
P4(pitch)
<input type="text" name="p4y" value="" style="width:60px">
</td>
<td>
Y5(yaw)
<input type="text" name="yp5x" value="" style="width:60px">
</td>
<td>
P5(pitch)
<input type="text" name="p5y" value="" style="width:60px">
</td>
<td>
Y6(yaw)
<input type="text" name="y6x" value="" style="width:60px">
</td>
<td>
P6(pitch)
<input type="text" name="p6y" value="" style="width:60px">
</td>
</tr>
<tr>
<td>Preset</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>
<input type="button" value="Generate" style="width:100px" onClick="do_tl();">
</td>
</tr>
<tr>
<td colspan="6">
<textarea name="preset" rows="18" cols="95"></textarea>
</td>
</tr>
</table>
</form>
</body>
</html>
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Claude 
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