scratchfoundation/paper.js
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Check curve bounds before recursively clipping.

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The speeds are back to "normal"!
This commit is contained in:
hkrish 2013-05-15 21:53:05 +02:00
parent 3449f7e69b
commit f6e474da50
1 changed files with 18 additions and 14 deletions
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32
fatline/Intersect.js
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@ -229,24 +229,28 @@ function _clipBezierFatLine( v1, v2, v2t ){
}
// Return the parameter values for v2 for which we can be sure that the
// intersection with v1 lies within.
if(tmin === Infinity || tmax === -Infinity){
return -1;
}
if( tmaxdmin > tmax ){ tmax = 1; }
if(tmin !== Infinity && tmax !== -Infinity){
if( tmaxdmin > tmax ){ tmax = 1; }
// Debug: Plot the non-parametric graph and hull
// plotD_vs_t( 500, 110, Dt, [dq0, dq1, dq2, dq3], v1, dmin, dmax, tmin, tmax, 1.0 / ( tmax - tmin + 0.3 ) )
// tmin and tmax are within the range (0, 1). We need to project it to the original
// parameter range for v2.
var v2tmin = v2t.t1;
var tdiff = ( v2t.t2 - v2tmin );
v2t.t1 = v2tmin + tmin * tdiff;
v2t.t2 = v2tmin + tmax * tdiff;
// If the new parameter range fails to converge by atleast 20% of the original range,
// possibly we have multiple intersections. We need to subdivide one of the curves.
if( (tdiff - ( v2t.t2 - v2t.t1 ))/tdiff < 0.2 ){
// tmin and tmax are within the range (0, 1). We need to project it to the original
// parameter range for v2.
var v2tmin = v2t.t1;
var tdiff = ( v2t.t2 - v2tmin );
v2t.t1 = v2tmin + tmin * tdiff;
v2t.t2 = v2tmin + tmax * tdiff;
// If the new parameter range fails to converge by atleast 20% of the original range,
// possibly we have multiple intersections. We need to subdivide one of the curves.
if( (tdiff - ( v2t.t2 - v2t.t1 ))/tdiff >= 0.2 ){
return 1;
}
}
// TODO: Try checking with a perpendicular fatline to see if the curves overlap
// if it is any faster than this
if( Curve.getBounds( v1 ).touches( Curve.getBounds( v2 ) ) ){
return -1;
}
return 1;
return 0;
}
/**