import rhinoscriptsyntax as rs
import random as ran

rs.DeleteObjects(rs.AllObjects())

highest_hgt = 5             #highest point of the bridge
lowest_hgt = -3             #lowest point of the bridge
side_stair_hgt =1           #heigt of the stair bow on the sides
sup_str_hgt = -3            #lowest point of the support structure
cr_pt_dis = 10              #distance between crossing point and middle
half_bridge_len = 17        #halv the lenght of the bridge in total
side_stair_len= half_bridge_len-cr_pt_dis    #length of the side stair
cir_rad = 3                 #radius of the circle podest at the end of the bridge
up_stair_width = 3          #width of upper stair
down_stair_width = 2        #width of lower stair
side_stair_width = up_stair_width + 2*down_stair_width  #width of side stair
thick = 0.2                 #thickness of the ramp
sup_str_width = 0.1         #width of support structure

#######################
#create rails 
#######################

#create line of upper bow 
upper_bow = rs.AddInterpCurve(([0,0,highest_hgt],[cr_pt_dis/2,0,highest_hgt-1], [cr_pt_dis,0,0]),3, start_tangent=([1,0,0]), end_tangent=[1,0,-1])

#create lines of support structure
sup_str_1 = rs.AddInterpCurve(([cr_pt_dis,-up_stair_width/2,0],[half_bridge_len,-up_stair_width/2,sup_str_hgt]),3, start_tangent=([1,0,-1]), end_tangent=[1,0,0])
sup_str_2 = rs.AddInterpCurve(([cr_pt_dis,up_stair_width/2,0],[half_bridge_len,up_stair_width/2,sup_str_hgt]),3, start_tangent=([1,0,-1]), end_tangent=[1,0,0])

#create lines of lower bow 
low_bow_1 = line2=rs.AddInterpCurve(([0,(-up_stair_width/2-down_stair_width/2+sup_str_width/2),lowest_hgt],[cr_pt_dis,(-up_stair_width/2-down_stair_width/2),0]),3,start_tangent=([1,0,0]), end_tangent=[1,0,0.5])
low_bow_2 = line2=rs.AddInterpCurve(([0,(up_stair_width/2+down_stair_width/2-sup_str_width/2),lowest_hgt],[cr_pt_dis,(up_stair_width/2+down_stair_width/2),0]),3,start_tangent=([1,0,0]), end_tangent=[1,0,0.5])

#create line of side bow
side_bow = line2=rs.AddInterpCurve(([cr_pt_dis,0,0],[half_bridge_len-side_stair_len/2,0,side_stair_hgt],[half_bridge_len,0,0]),3,start_tangent=([1,0,0.5]), end_tangent=[1,0,0])

######################
#create ramps
######################

#create upper ramp
rec1 = rs.AddRectangle([0,-up_stair_width/2,highest_hgt],thick,up_stair_width)
rs.RotateObject(rec1,(0,0,highest_hgt),90, axis=(0,1,0))
rs.AddSweep1(upper_bow, [rec1], closed=True)

#create first lower ramp
rec2 = rs.AddRectangle([0,up_stair_width/2,lowest_hgt],thick,down_stair_width)
rs.RotateObject(rec2,(0,0,lowest_hgt),90, axis=(0,1,0))
rs.AddSweep1(low_bow_1, [rec2], closed=True)

#create second lower ramp
rec3 = rs.AddRectangle([0,-down_stair_width-up_stair_width/2,lowest_hgt],thick,down_stair_width)
rs.RotateObject(rec3,(0,0,lowest_hgt),90, axis=(0,1,0))
rs.AddSweep1(low_bow_2, [rec3], closed=True)

#create side ramp
rec4 = rs.AddRectangle([cr_pt_dis,-up_stair_width/2-down_stair_width,0],thick,side_stair_width)
rs.RotateObject(rec4,(cr_pt_dis,0,0),90, axis=(0,1,0))
rs.AddSweep1(side_bow, [rec4], closed=True)

#create support structure 1
rec5 = rs.AddRectangle([cr_pt_dis,-up_stair_width/2+sup_str_width/2,0],sup_str_width,sup_str_width)
rs.RotateObject(rec5,(cr_pt_dis,0,0),90, axis=(0,1,0))
rs.AddSweep1(sup_str_1, [rec5], closed=True)

#create support structure2
rec6 = rs.AddRectangle([cr_pt_dis,up_stair_width/2-sup_str_width/2,0],sup_str_width,sup_str_width)
rs.RotateObject(rec6,(cr_pt_dis,0,0),90, axis=(0,1,0))
rs.AddSweep1(sup_str_2, [rec6], closed=True)

##mirror all objects
#allobjs=rs.SelectedObjects(rs.AllObjects())
#rs.MirrorObjects(allobjs,[0,0,0],[0,1,1],copy=True)