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Lightningbeam
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Added drawing functionality - both line and smooth

This commit is contained in:
Skyler Lehmkuhl 2012-01-11 14:27:05 -05:00
parent 9e6f7f8dec
commit d2f01601ce
2 changed files with 91 additions and 0 deletions
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6
lightningbeam
View File

@ -85,6 +85,12 @@ def onMouseUpGroup(self, x, y):
self.clicked = False
if svlgui.MODE in ["r", "e"]:
self.cshape = None
elif svlgui.MODE=="p":
print len(self.cshape.shapedata)
self.cshape.shapedata = misc_funcs.simplify_shape(self.cshape.shapedata, "curve",1)
print len(self.cshape.shapedata)
self.cshape = None
MainWindow.stage.draw()
def onMouseUpObj(self, x, y):
self.clicked = False
def onMouseMoveGroup(self, x, y):

85
misc_funcs.py
View File

@ -5,6 +5,7 @@
import svlgui
from threading import Event, Thread
import math
def select_any(self):
svlgui.MODE = " "
@ -53,6 +54,90 @@ def lastval(arr,index):
return i
def catmullRom2bezier( points ) :
#crp = points.split(/[,\s]/);
crp = points
d = [["M",points[0][1],points[0][2]]];
'''
i = 0
iLen = len(crp);
while iLen - 2 > i:
i+=2
p = [];
if 0 == i:
p.append( [crp[i], crp[i+1]);
p.append( [crp[i], crp[i+1]);
p.append( [crp[i+2], crp[i+3]);
p.append( [crp[i+4], crp[i+5]);
elif iLen - 4 == i:
p.append( [crp[i-2], crp[i-1]]);
p.append( [crp[i], crp[i+1]]);
p.append( [crp[i+2], crp[i+3]]);
p.append( [crp[i+2], crp[i+3]]);
} else {
p.append( [crp[i-2], crp[i-1]]);
p.append( [crp[i], crp[i+1]]);
p.append( [crp[i+2], crp[i+3]]);
p.append( [crp[i+4], crp[i+5]]);
}
'''
for i in range(2,len(crp)-2):
p = [ [crp[i-1][1],crp[i-1][2]], [crp[i][1],crp[i][2]], [crp[i+1][1],crp[i+1][2]], [crp[i+2][1],crp[i+2][2]] ]
# Catmull-Rom to Cubic Bezier conversion matrix
# 0 1 0 0
# -1/6 1 1/6 0
# 0 1/6 1 -1/6
# 0 0 1 0
bp = []
bp.append( [p[1][0], p[1][1]] );
bp.append( [(-p[0][0]+6*p[1][0]+ p[2][0])/6, ((-p[0][1]+6*p[1][1]+p[2][1])/6)]);
bp.append( [(p[1][0]+6*p[2][0]-p[3][0])/6, ((p[1][1]+6*p[2][1]-p[3][1])/6)]);
bp.append( [ p[2][0], p[2][1] ] );
d.append( ["C", bp[1][0], bp[1][1], bp[2][0], bp[2][1], bp[3][0], bp[3][1]]);
return d;
def simplify_shape(shape,mode,iterations):
if mode in ("straight","curve"):
for i in xrange(iterations):
for j in reversed(range(len(shape))):
if j>0 and j<len(shape)-1:
pax=shape[j-1][1];
pay=shape[j-1][2];
pbx=shape[j][1];
pby=shape[j][2];
pcx=shape[j+1][1];
pcy=shape[j+1][2];
abx=pax-pbx;
aby=pay-pby;
#____________calculate ab,bc,ca, Angles A, B, c _________________________
ab=math.sqrt(abx*abx+aby*aby);
bcx=pbx-pcx;
bcy=pby-pcy;
bc=math.sqrt(bcx*bcx+bcy*bcy);
cax=pcx-pax;
cay=pcy-pay;
ca=math.sqrt(cax*cax+cay*cay);
cosB=-(ca*ca-bc*bc-ab*ab)/(2*bc*ab);
try:
acosB=math.acos(cosB)*180/math.pi;
except ValueError:
acosB=0
if acosB>(165-500/(ab+bc)): # at least 15 degrees away from straight angle
del shape[j]
if mode=="curve":
shape = catmullRom2bezier([shape[0]]*2+shape+[shape[-1]])
print shape
return shape#+nshape
# Timer module - not mine
# Copyright (c) 2009 Geoffrey Foster