' initiate stuff
SuperStrict ' make blitzmax mean! (and tidy!)
SeedRnd MilliSecs() ' make randomly generated numbers to choose from.
Graphics(1024,768,32) ' set up a graphics object
SetBlend(3) ' set the blend mode
SetAlpha(1)
' types / lists
Type point
Field x!,y!,z!,rotx!,roty!,rotz!,angle!,distance!
End Type
Global pointlist:TList = CreateList()
' engine globals
Global camerax! = 0 ' set up camera
Global cameray! = 0
Global cameraz! = -400
Global x!,y!
Global cameraxangle! = 0
Global camerayangle! = 0
Global lensxangle! = -90
Global lensyangle! = -90
For Local loop:Int = 0 To 70
CreatePoint(Rnd(-100,100),Rnd(-100,100),Rnd(-100,100))
Next
While Not KeyHit(key_escape)
Cls
If KeyDown(key_a) cameraxangle!:+1
If KeyDown(key_d) cameraxangle!:-1
If KeyDown(key_w) camerayangle!:+1
If KeyDown(key_s) camerayangle!:-1
If KeyDown(key_right) camerax!:-1
If KeyDown(key_left) camerax!:+1
If KeyDown(key_up) cameray!:+1
If KeyDown(key_down) cameray!:-1
If KeyDown(key_1) cameraz!:-1
If KeyDown(key_2) cameraz!:+1
For Local p:point = EachIn pointlist
For Local p2:point = EachIn pointlist
DrawLine(Get3DX!(p.x!,p.roty!,p.rotz!),Get3DY!(p.x!,p.roty!,p.rotz!),Get3DX!(p2.x!,p2.roty!,p2.rotz!),..
Get3DY!(p2.x!,p2.roty!,p2.rotz!))
Next
Next
DrawPoints()
Flip
Wend
End
Function RotateCameraY!(p:point)
p.distance! = GetDistance!(p.y!,p.z!,cameray!,cameraz!)
p.angle! = GetAngle!(p.y!,p.z!,cameray!,cameraz!)
p.roty! = (cameray! + (Cos(p.angle! + camerayangle!) * p.distance!))
p.rotz! = (cameraz! + (Sin(p.angle! + camerayangle!) * p.distance!))
End Function
Function GetAngle!(x1!,y1!,x2!,y2!)
Return(ATan2((y2! - y1!),(x2! - x1!)))
End Function
Function GetDistance!(x1!,y1!,x2!,y2!)
Return(Sqr((x2! - x1!)^2 + (y2! - y1!)^2))
End Function
Function CreatePoint(x!,y!,z!)
Local p:point
p:point = New point
p.x! = x!
p.y! = y!
p.z! = z!
ListAddLast(pointlist:TList,p:point)
End Function
Function DrawPoints()
Local p:point
For p:point = EachIn pointlist:TList
RotateCameraY(p:point)
If p.rotz! > cameraz!
Plot(Get3DX!(p.x!,p.roty!,p.rotz!),Get3DY!(p.x!,p.roty!,p.rotz!))
EndIf
Next
End Function
Function Get3DX!(x!,y!,z!)
Return((camerax! - x!) + (Double Tan(lensxangle! / 2) * (z! - cameraz!)) / 2) * GraphicsWidth() / (Double Tan(lensxangle! / 2) * (z! - cameraz!))
End Function
Function Get3DY!(x!,y!,z!)
Return((cameray! - y!) + (Double Tan(lensyangle! / 2) * (z! - cameraz!)) / 2) * GraphicsHeight() / (Double Tan(lensyangle! / 2) * (z! - cameraz!))
End Function |
