278 lines
9.9 KiB
Python
278 lines
9.9 KiB
Python
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import sys
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from kivy.uix.widget import Widget
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from kivy.core.window import Window
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from point import Point
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# cross painter
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class Cross_painter(Widget):
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def __init__(self,app,**kwargs):
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# list of crosses
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self.crosses=[]
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# cross under mouse
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self.undermouse=None
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# list of selected crosses
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self.selected=[]
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# app is used to share information between widgets
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self.app=app
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# modifiers
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self.modifiers=[]
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# init Widget
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super(Cross_painter,self).__init__(**kwargs)
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# init keyboard
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self.keyboard = Window.request_keyboard(None,self,"text")
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self.keyboard.bind(on_key_down=self.on_key_down,on_key_up=self.on_key_up)
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def reset(self):
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self.crosses=[]
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self.undermouse=None
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self.draw()
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# draw all crosses
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def draw(self):
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self.canvas.clear()
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with self.canvas:
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for cross in self.crosses:
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cross.draw()
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# respond to keyboard
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def on_key_down(self, keyboard, keycode, text, modifiers):
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# check that command_prompt is not focused
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if not self.app.command_prompt.insert:
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if keycode[1]=="shift":
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if not 's' in self.modifiers:
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self.modifiers.append('s')
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self.modifiers.sort()
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def on_key_up(self, keyboard, keycode):
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if keycode[1]=="shift":
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if 's' in self.modifiers:
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# remove
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self.modifiers[self.modifiers.index('s')]=self.modifiers[len(self.modifiers)-1]
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self.modifiers=self.modifiers[:len(self.modifiers)-1]
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self.modifiers.sort()
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# respond to mouse down
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def on_touch_down(self,touch):
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# only respond to touch in area
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if self.collide_point(*touch.pos):
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# create new cross
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if touch.button=="right":
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if self.check_interaction_any(Point(touch.x/Cross.size,touch.y/Cross.size),None):
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new=Cross(touch.x/Cross.size,touch.y/Cross.size)
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# add to list
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self.crosses.append(new)
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# unselect all crosses
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for sel in self.selected:
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sel.selected=False
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self.selected=[]
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self.draw()
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# select cross
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if touch.button=="left":
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# find cross under touch
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self.undermouse=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size))
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# no modifiers
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if self.modifiers==[]:
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if self.undermouse==None or not self.undermouse in self.selected:
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# unselect all crosses
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for sel in self.selected:
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sel.selected=False
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self.selected=[]
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# shift-click
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elif self.modifiers==['s']:
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if self.undermouse!=None:
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if self.undermouse not in self.selected:
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self.selected.append(self.undermouse)
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self.undermouse.selected=True
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else:
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# remove
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self.selected[self.selected.index(self.undermouse)]=self.selected[len(self.selected)-1]
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self.selected=self.selected[:len(self.selected)-1]
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self.undermouse.selected=False
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self.draw()
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# respond to drag
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def on_touch_move(self,touch):
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if self.collide_point(*touch.pos):
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# only move on left click
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if touch.button=="left" and self.modifiers==[] and self.undermouse!=None:
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# single cross
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if not self.undermouse in self.selected:
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self.undermouse.pos=self.check_move(Point(touch.x/Cross.size,touch.y/Cross.size),self.undermouse)
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# multiple crosses
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else:
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self.group_move(touch)
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# redraw
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self.draw()
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# move all selected crosses
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def group_move(self,touch):
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# save position of undermouse (to use it after it has been reset)
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relative_position=self.undermouse.pos
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# determine order in which to move
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# direction of motion
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direction=Point(touch.x/Cross.size,touch.y/Cross.size)-self.undermouse.pos
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# sort according to scalar product with direction
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self.selected.sort(key=(lambda cross: direction.dot(cross.pos-self.undermouse.pos)),reverse=True)
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# move
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for cross in self.selected:
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cross.pos=self.check_move(Point(touch.x/Cross.size-relative_position.x+cross.pos.x,touch.y/Cross.size-relative_position.y+cross.pos.y),cross)
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## new position of undermouse
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#self.undermouse.pos=self.check_move(Point(touch.x/Cross.size,touch.y/Cross.size),self.undermouse)
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## move other crosses by the same amount as undermouse
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#for cross in self.selected:
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# if cross!=self.undermouse:
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# cross.pos=self.check_move(Point(self.undermouse.pos.x-relative_position.x+cross.pos.x,self.undermouse.pos.y-relative_position.y+cross.pos.y),cross)
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#
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#for cross in self.selected:
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# cross.pos=self.check_move(Point(touch.x/Cross.size-relative_position.x+cross.pos.x,touch.y/Cross.size-relative_position.y+cross.pos.y),cross)
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# find the cross at position pos
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def find_cross(self,pos):
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for cross in self.crosses:
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if cross_distx(pos,cross.pos)<=0.5 or cross_disty(pos,cross.pos)<=0.5:
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return cross
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# none found
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return None
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# check whether a position intersects with any of the crosses
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def check_interaction_any(self,pos,exception):
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for other in self.crosses:
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if other!=exception:
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if other.check_interaction(pos)==False:
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return False
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return True
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# check that a cross can move to new position
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def check_move(self,newpos,cross):
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# whether newpos is acceptable
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accept_newpos=True
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for other in self.crosses:
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# do not compare a cross to itself
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if other!=cross:
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# move would make cross overlap with other
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if other.check_interaction(newpos)==False:
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accept_newpos=False
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# check if cross touches other
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if other.check_touch(cross.pos):
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# move along other while remaining stuck
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candidate=other.move_along(newpos,cross.pos)
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else:
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candidate=other.move_on_line_to_stick(cross.pos,newpos-cross.pos)
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if self.check_interaction_any(candidate,cross):
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return candidate
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if accept_newpos:
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return newpos
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else:
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# cannot move cross at all, try again
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return self.check_move(candidate,cross)
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# write configuration to file
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def write(self,file):
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ff=open(file,"w")
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for cross in self.crosses:
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ff.write("{:05.2f},{:05.2f};{:3.1f},{:3.1f},{:3.1f}\n".format(cross.pos.x,cross.pos.y,cross.color[0],cross.color[1],cross.color[2]))
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ff.close()
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# read configuration from file
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def read(self,file):
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self.reset()
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try:
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ff=open(file,"r")
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except:
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self.app.command_prompt.message="error: could not read file '"+file+"' (this should not happen and is probably a bug)"
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return
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# counter
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i=0
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try:
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lines=ff.readlines()
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except:
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self.app.command_prompt.message="error: could not read the contents of file '"+file+"'"
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return
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for line in lines:
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i+=1
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# remove newline
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line=line[:len(line)-1]
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# ignore comments
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if '#' in line:
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line=line[:line.find('#')]
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# ignore empty lines
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if len(line)==0:
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continue
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entries=line.split(";")
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# skip line if improperly formatted
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if len(entries)>2:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': more than two ';' spearated entries in '"+line+"'",file=sys.stderr)
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continue
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# position
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pos_str=entries[0].split(",")
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# skip line if improperly formatted
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if len(pos_str)!=2:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': position '"+entries[0]+"' does not have two components",file=sys.stderr)
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continue
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try:
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pos=Point(float(pos_str[0]),float(pos_str[1]))
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except:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': position '"+entries[0]+"' cannot be read",file=sys.stderr)
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continue
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# color
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color=(0,0,1)
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if len(entries)==2:
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color_str=entries[1].split(",")
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# skip line if improperly formatted
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if len(color_str)!=3:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': color '"+entries[1]+"' does not have three components",file=sys.stderr)
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continue
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try:
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color=(float(color_str[0]),float(color_str[1]),float(color_str[2]))
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except:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': color '"+entries[1]+"' cannot be read",file=sys.stderr)
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continue
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if self.check_interaction_any(pos,None):
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# add to list
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self.crosses.append(Cross(pos.x,pos.y,color=color))
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else:
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print("warning: ignoring line "+str(i)+" in file '"+file+"': particle overlaps with existing particles",file=sys.stderr)
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ff.close()
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self.draw()
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