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| author | David Robillard <d@drobilla.net> | 2013-12-20 04:28:15 +0000 |
|---|---|---|
| committer | David Robillard <d@drobilla.net> | 2013-12-20 04:28:15 +0000 |
| commit | 10de1f9ec25507b5d67fb89d460aa65815e4fe19 (patch) | |
| tree | 18ae959a0805060e157908448c6dfa5cf8fa2c70 /src/Canvas.cpp | |
| parent | 5028bd116503d045591782265981f40c7f5699cd (diff) | |
| download | ganv-10de1f9ec25507b5d67fb89d460aa65815e4fe19.tar.gz ganv-10de1f9ec25507b5d67fb89d460aa65815e4fe19.tar.bz2 ganv-10de1f9ec25507b5d67fb89d460aa65815e4fe19.zip | |
FDGL: Use inverse cubic charge law and tide force to prevent graph explosion.
git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@5190 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'src/Canvas.cpp')
| -rw-r--r-- | src/Canvas.cpp | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/src/Canvas.cpp b/src/Canvas.cpp index 20180e3..65f2b16 100644 --- a/src/Canvas.cpp +++ b/src/Canvas.cpp @@ -734,7 +734,7 @@ GanvCanvasImpl::layout_iteration() static const double SPRING_K = 14.0; // A light directional force to push sources to the top left - static const double DIR_MAGNITUDE = -300.0; + static const double DIR_MAGNITUDE = -600.0; Vector dir = { 0.0, 0.0 }; switch (_gcanvas->direction) { case GANV_DIRECTION_RIGHT: dir.x = DIR_MAGNITUDE; break; @@ -795,6 +795,15 @@ GanvCanvasImpl::layout_iteration() continue; } + /* Add tide force which pulls all objects as if the layout is happening + on a flowing river surface. This prevents disconnected components + from being ejected, since at some point the tide force will be + greater than distant repelling charges. */ + const Vector mouth = { -10000.0, -10000.0 }; + node->impl->force = vec_add( + node->impl->force, + tide_force(mouth, reg.pos, 4000000000000.0)); + FOREACH_ITEM(_items, j) { if (i == j || (!GANV_IS_MODULE(*i) && !GANV_IS_CIRCLE(*i))) { continue; @@ -818,8 +827,8 @@ GanvCanvasImpl::layout_iteration() GanvNode* const node = GANV_NODE(*i); - static const float dur = 0.15; // Time duration - static const float damp = 0.7; // Velocity damping (momentum loss) + static const float dur = 0.1; // Time duration + static const float damp = 0.5; // Velocity damping const bool has_edges = (node->impl->has_in_edges || node->impl->has_out_edges); @@ -827,10 +836,19 @@ GanvCanvasImpl::layout_iteration() node->impl->vel.x = 0.0; node->impl->vel.y = 0.0; } else { + node->impl->vel = vec_mult(node->impl->vel, damp); node->impl->vel = vec_add(node->impl->vel, vec_mult(node->impl->force, dur)); - node->impl->vel = vec_mult(node->impl->vel, damp); + // Clamp velocity + const double vel_mag = vec_mag(node->impl->vel); + static const double MAX_VEL = 4000.0; + if (vel_mag > MAX_VEL) { + node->impl->vel = vec_mult( + vec_mult(node->impl->vel, 1.0 / vel_mag), + MAX_VEL); + } + // Update position const Vector dpos = vec_mult(node->impl->vel, dur); if (fabs(dpos.x) >= 1.0 || fabs(dpos.y) >= 1.0) { |