light9 Changeset - 22529016c4f2

Changeset - 22529016c4f2

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drewp@bigasterisk.com - 20 years ago 2005-06-18 04:13:46
drewp@bigasterisk.com

new curve sketching

2 files changed with 95 insertions and 8 deletions:

bin/curvecalc

light9/curve.py

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bin/curvecalc

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@@ @@ -347,7 +347,7 @@ root.bind("<Control-Key-s>",savekey) @@
 root.bind("<Control-Key-r>", lambda evt: dispatcher.send('reload all subs'))
 create_status_lines(root)
 for helpline in ["Bindings: C-s save subterms; B1 drag point; C-B1 curve add point; 1..5 add point at time; Esc see current time; S-Esc see curtime to end; Mousewheel zoom; C-p play/pause music at mouse",
+for helpline in ["Bindings: C-s save subterms; B1 drag point; C-B1 curve add point; S-B1 sketch points; 1..5 add point at time; Esc see current time; S-Esc see curtime to end; Mousewheel zoom; C-p play/pause music at mouse",
                  "Available in functions: nsin/ncos period=amp=1; within(a,b) bef(x) aft(x) compare to time; smoove(x) cubic smoothstep; curvename(t) eval curve"]:
     tk.Label(root,text=helpline, font="Helvetica -12 italic",
              anchor='w').pack(side='top',fill='x')

light9/curve.py

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@@ @@ -44,11 +44,83 @@ class Curve: @@
         frac = (t-p1[0])/(p2[0]-p1[0])
         y = p1[1]+(p2[1]-p1[1])*frac
         return y
     __call__=eval
     def insert_pt(self,new_pt):
         i = bisect(self.points,(new_pt[0],None))
         self.points.insert(i,new_pt)
     __call__=eval
     def indices_between(self, x1, x2):
         leftidx = max(0, bisect_left(self.points, (x1,None)) - 1)
         rightidx = min(len(self.points) - 1,
                        bisect_left(self.points, (x2,None)) + 1)
         return range(leftidx, rightidx+1)
     def points_between(self, x1, x2):
         return [self.points[i] for i in self.indices_between(x1,x2)]
 def vlen(v):
     return math.sqrt(v[0]*v[0] + v[1]*v[1])
 def angle_between(base, p0, p1):
     p0 = p0[0] - base[0], p0[1] - base[1]
     p1 = p1[0] - base[0], p1[1] - base[1]
     p0 = [x/vlen(p0) for x in p0]
     p1 = [x/vlen(p1) for x in p1]
     dot = p0[0]*p1[0]+p0[1]*p1[1]
     dot = max(-1,min(1,dot))
     return math.degrees(math.acos(dot))
 class Sketch:
     """a sketch motion on a curveview, with temporary points while you
     draw, and simplification when you release"""
     def __init__(self,curveview,ev):
         self.curveview = curveview
         self.pts = []
         self.last_x = None
     def motion(self,ev):
         p = self.curveview.world_from_screen(ev.x, ev.y)
         p = p[0], max(0,min(1,p[1]))
         if self.last_x is not None and abs(ev.x - self.last_x) < 4:
             return
         self.last_x = ev.x
         self.pts.append(p)
         self.curveview.add_point(p)
     def release(self,ev):
         pts = self.pts
         pts.sort()
         dx = .01
         to_remove = []
         for i in range(1,len(pts)-1):
             x = pts[i][0]
             p_left = (x - dx, self.curveview.curve(x - dx))
             p_right = (x + dx, self.curveview.curve(x + dx))
             if angle_between(pts[i], p_left, p_right) > 160:
                 to_remove.append(i)
         for i in to_remove:
             self.curveview.curve.points.remove(pts[i])
         # the simplified curve may now be too far away from some of
         # the points, so we'll put them back. this has an unfortunate
         # bias toward reinserting the earlier points
         for i in to_remove:
             p = pts[i]
             if abs(self.curveview.curve(p[0]) - p[1]) > .1:
                 self.curveview.add_point(p)
         self.curveview.update_curve()
     def slope(self,p1,p2):
         if p2[0] == p1[0]:
             return 0
         return (p2[1] - p1[1]) / (p2[0] - p1[0])
 class Curveview(tk.Canvas):
     def __init__(self,master,curve,**kw):
@@ @@ -91,6 +163,23 @@ class Curveview(tk.Canvas): @@
         # this binds on c-a-b1, etc
         RegionZoom(self, self.world_from_screen, self.screen_from_world)
         self.sketch = None # an in-progress sketch
         self.bind("<Shift-ButtonPress-1>", self.sketch_press)
         self.bind("<Shift-B1-Motion>", self.sketch_motion)
         self.bind("<Shift-ButtonRelease-1>", self.sketch_release)
     def sketch_press(self,ev):
         self.sketch = Sketch(self,ev)
     def sketch_motion(self,ev):
         if self.sketch:
             self.sketch.motion(ev)
     def sketch_release(self,ev):
         if self.sketch:
             self.sketch.release(ev)
             self.sketch = None
     def current_time(self):
         return self._time
@@ @@ -110,6 +199,7 @@ class Curveview(tk.Canvas): @@
         self.delete('timecursor')
         self.create_line(*pts,**dict(width=2,fill='red',tags=('timecursor',)))
         self._time = t
     def update_curve(self,*args):
         self.zoom = dispatcher.send("zoom area")[0][1]
@@ @@ -118,11 +208,8 @@ class Curveview(tk.Canvas): @@
         visible_x = (self.world_from_screen(0,0)[0],
                      self.world_from_screen(self.winfo_width(),0)[0])
         visleftidx = max(0,bisect_left(cp,(visible_x[0],None))-1)
         visrightidx = min(len(cp)-1,bisect_left(cp,(visible_x[1],None))+1)
         visible_points = cp[visleftidx:visrightidx+1]
         visible_idxs = range(visleftidx,visrightidx+1)
         visible_points = self.curve.points_between(*visible_x)
         visible_idxs = self.curve.indices_between(*visible_x)
         self.delete('curve')
@@ @@ -208,7 +295,7 @@ class Curveview(tk.Canvas): @@
                 dot2 = self.create_oval(p[0]-rad,p[1]-rad,
                                              p[0]+rad,p[1]+rad,
                                              outline='darkgreen',
-                                             tags=('curve','point', 'handle%d' % i))
                                        tags=('curve','point', 'handle%d' % i))
             self.tag_bind('handle%d' % i,"<ButtonPress-1>",
                           lambda ev,i=i: self.dotpress(ev,i))
             self.bind("<Motion>",

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