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98 lines
1.9 KiB
Plaintext
98 lines
1.9 KiB
Plaintext
/datum/sun
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var/angle
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var/dx
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var/dy
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var/counter = 50 // to make the vars update during 1st call
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var/rate
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/datum/sun/New()
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rate = rand(75,125)/100 // 75% - 125% of standard rotation
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if(prob(50))
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rate = -rate
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// calculate the sun's position given the time of day
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/datum/sun/proc/calc_position()
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counter++
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if(counter<50) // count 50 pticks (50 seconds, roughly - about a 5deg change)
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return
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counter = 0
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angle = ((rate*world.realtime/100)%360 + 360)%360 // gives about a 60 minute rotation time
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// now 45 - 75 minutes, depending on rate
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// now calculate and cache the (dx,dy) increments for line drawing
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var/s = sin(angle)
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var/c = cos(angle)
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if(c == 0)
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dx = 0
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dy = s
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else if( abs(s) < abs(c))
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dx = s / abs(c)
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dy = c / abs(c)
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else
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dx = s/abs(s)
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dy = c / abs(s)
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for(var/obj/machinery/power/tracker/T in machines)
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T.set_angle(angle)
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for(var/obj/machinery/power/solar/S in machines)
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occlusion(S)
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// for a solar panel, trace towards sun to see if we're in shadow
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/datum/sun/proc/occlusion(var/obj/machinery/power/solar/S)
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var/ax = S.x // start at the solar panel
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var/ay = S.y
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for(var/i = 1 to 20) // 20 steps is enough
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ax += dx // do step
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ay += dy
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var/turf/T = locate( round(ax,0.5),round(ay,0.5),S.z)
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if(T.x == 1 || T.x==world.maxx || T.y==1 || T.y==world.maxy) // not obscured if we reach the edge
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break
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if(T.density) // if we hit a solid turf, panel is obscured
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S.obscured = 1
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return
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S.obscured = 0 // if hit the edge or stepped 20 times, not obscured
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S.update_solar_exposure()
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//returns the north-zero clockwise angle in degrees, given a direction
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/proc/dir2angle(var/D)
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switch(D)
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if(1)
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return 0
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if(2)
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return 180
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if(4)
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return 90
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if(8)
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return 270
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if(5)
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return 45
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if(6)
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return 135
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if(9)
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return 315
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if(10)
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return 225
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else
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return null
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