Graphics 800,600
SetBuffer BackBuffer()
Type shot
Field x#,y#
Field speed#
Field distance
Field travelled#
Field cr,cg,cb
End Type
Type particle
Field x#,y#
Field angle#
Field speed#
Field time
Field timer
End Type
While Not KeyHit(1)
Cls
; x y speed distance
If KeyHit(2) Then fire_shot(Rnd(10,700) , Rnd(200,600) , Rnd(0.5,3) , Rnd(50,180))
update_shots()
update_particles()
Flip
Wend
End
Function fire_shot(x#,y#,speed#,distance#)
s.shot=New shot
s\x = x
s\y = y
s\speed = speed
s\distance = s\y-distance
s\cr = Rand(100,255)
s\cg = Rand(100,155)
s\cb = Rand(10,100)
End Function
Function update_shots()
For s.shot=Each shot
s\y=s\y-s\speed ; move shot
Color s\cr,s\cg,s\cb ; set color
Rect s\x,s\y,2,2; draw particle
If s\y<s\distance Then
trnd=Rand(1,6); number of Rings of particles the shot will produce (min,max)
For mloop=1 To trnd; loop for the number of rings of particles the shot will produce (min,max)
speed#=Rnd(0.2,2); rnd speed for each ring of particles
incr#=Rnd(10,70); angle/spacing between each particle
For loop=0 To incr; loop thru each particle in the loop, and create
create_new_particle(s\x,s\y,Rnd(speed*0.8,speed*1.2),loop*(360/incr))
Next
Next
Delete s.shot
End If
Next
End Function
Function create_new_particle(x#,y#,speed#,angle)
p.particle=New particle
p\x=x
p\y=y
p\speed=speed
p\angle=angle
p\timer=MilliSecs()
p\time=Rand(500,2000)
End Function
Function update_particles()
For p.particle=Each particle
p\x=p\x+Cos(p\angle)*p\speed ; move particle
p\y=p\y+Sin(p\angle)*p\speed ; move particle
temp=Rand(100,255) ; random red color
temp1=Rand(10,temp) ; random green colour, based on the result of the random red colour
Color temp,temp1,Rand(10,190) ; set colour
Rect p\x,p\y,Rand(1,4),Rand(1,4) ; set colour
If MilliSecs()>p\timer+p\time Then
Delete p.particle
End If
Next
End Function |
