Basic Particle Engine

[Matthew SmithParticipant]

Using some converted BlizMax code by Mark Incitti, find below a basic particle engine using DrawLine and Image to generate various types of particles.

You will require the latest change to the Canvas code here (or v1.0.2 or greater)

https://github.com/blitz-research/monkey2/commit/f281fe921c317ab3330a99cde4c131dbbb368209

The required particle image is attached at the bottom. Also much thanks to Mark for adding LineWidth and some line smoothing! Particle Style 3 looks the goods!

Monkey

'----------------------------------------------------------------------- ' ' Based on BlitzMax code created by Mark Incitti ' '----------------------------------------------------------------------- Namespace myapp #Import "<std>" #Import "<mojo>" Using std.. Using mojo.. #Import "particle.png" Global particleImage:Image Const Size:=New Vec2i( 640,360 ) Const NumParticles:Int=2048 Const ParticleLife:Int=40 Const ParticleDecay:Float=0.95 Function Main() New AppInstance New MyWindow App.Run() End Class MyWindow Extends Window Private Field _particles:ParticleManager Field _style:Int=0 Public Method New() 'Create window Super.New( "Particles!",640,480,WindowFlags.Fullscreen ) Layout="letterbox" ClearColor=New Color(0,0,0) Mouse.PointerVisible=True Style.BackgroundColor=GetColor(2,2,2) 'Load image particleImage=Image.Load("asset::particle.png",TextureFlags.Filter) particleImage.Handle=New Vec2f(0.5,0.5) 'Initialise particles _particles=New ParticleManager() 'Randomise SeedRnd(Millisecs()) End Method OnRender( canvas:Canvas ) Override 'Features If (Keyboard.KeyHit(Key.P)) _style=(_style + 1) Mod 5 'Release particles? If(Rnd(0,100)>90) _particles.CreateFireWorks(0,_style) 'Update _particles.Update() 'Render App.RequestRender() _particles.Render(canvas) 'Text canvas.Color=Color.White canvas.DrawText("Style: "+_style,4,App.ActiveWindow.Height-40) canvas.DrawText("Press 'P' to change",4,App.ActiveWindow.Height-25) End Method OnKeyEvent( event:KeyEvent ) Override select event.Type Case EventType.KeyDown If ( event.Key=Key.Enter And event.Modifiers & Modifier.Alt ) Fullscreen=Not Fullscreen If ( event.Key=Key.Escape ) App.Terminate() End End Method OnMeasure:Vec2i() Override Return Size End End Class ParticleManager Private Field _points:ParticlePoint[] Field _index:Int=0 Public Method New() 'Initialise _points=New ParticlePoint[NumParticles] End Method CreateParticles(x:Int,y:Int,style:Int=2,type:Int=0,particles:Int=32) 'Prepare Local r:Int=Rnd(0,4)*64 Local g:Int=Rnd(0,4)*64 Local b:Int=Rnd(0,4)*64 'Create Self.CreateParticles(x,y,style,type,r,g,b,particles) End Method CreateParticles(x:Int,y:Int,style:Int=2,type:Int=0,r:Int,g:Int,b:Int,particles:Int=32) 'Create For Local t:Int=0 Until particles Self.Create(x,y,style,type,r,g,b) Next End Method CreateFireWorks(position:Int,style:Int=2,type:Int=0) 'Prepare Local x:Int,y:Int Local r:Int=Rnd(0,4)*64 Local g:Int=Rnd(0,4)*64 Local b:Int=Rnd(0,4)*64 'Randomise style? If (style>3) style=Int(Rnd(0,4)) 'Get location Select position Case 1 If (Rnd()>=0.5) x=Rnd(100,App.ActiveWindow.Width-100) y=16 If (Rnd()>=0.5) y=App.ActiveWindow.Height-16 Else y=Rnd(50,App.ActiveWindow.Height-50) x=16 If (Rnd()>=0.5) x=App.ActiveWindow.Width-16 End Case 2 x=App.ActiveWindow.Width/2 y=App.ActiveWindow.Height/2 Default x=Rnd(0,App.ActiveWindow.Width-100) y=Rnd(0,App.ActiveWindow.Height-50) End 'Create For Local t:Int=0 To 63 Self.Create(x,y,style,type,r,g,b) Next End Method Update() 'Process For Local t:Int=0 To NumParticles-1 If (_points[t].active>0) _points[t].Update() Next End Method Reset() 'Reset _index=0 For Local t:Int=0 To NumParticles-1 _points[t].x=0 _points[t].y=0 _points[t].r=0 _points[t].g=0 _points[t].b=0 _points[t].active=0 _points[t].dx=0 _points[t].dy=0 Next End Method Render(canvas:Canvas) Local r:Float,g:Float,b:Float 'Prepare canvas.BlendMode=BlendMode.Additive canvas.TextureFilteringEnabled=True 'Process For Local t:int=0 To NumParticles-1 If (_points[t].active>0) Select _points[t].style Case 0 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=2.0 canvas.Alpha=1.0 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) Case 1 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=3.0 canvas.Alpha=0.8 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) Case 2 'Get color r=Min(_points[t].r*1.5,255.0) g=Min(_points[t].g*1.5,255.0) b=Min(_points[t].b*1.5,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=2.0 canvas.Alpha=1.0 canvas.DrawImage(particleImage,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy,0,0.5,0.5) Case 3 'BEST! 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw (line) canvas.LineWidth=2.0 canvas.Alpha=0.8 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) 'Draw (image) canvas.Alpha=0.25 canvas.DrawImage(particleImage,_points[t].x+_points[t].dx*1.0,_points[t].y+_points[t].dy*1.0) End End Next 'Reset canvas.BlendMode=BlendMode.Alpha canvas.Alpha=1.0 canvas.LineWidth=1.0 End Private Method Create(x:Float,y:Float,style:Int,type:Int,r:Int,g:Int,b:Int,rot:Float=0.0,size:Int=1) 'Prepare Local dir:Float Local mag:Float 'Set particle _points[_index].x=x _points[_index].y=y _points[_index].r=r _points[_index].g=g _points[_index].b=b _points[_index].active=Rnd(ParticleLife-20,ParticleLife) _points[_index].style=style 'Validate Select type Case 0 'Random dir=Rnd(0,360) mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 1 mag=16 _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag _points[_index].active=24 Case 2 mag=8 _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag Case 3 ' 3 dirs dir=120*Rnd(0,3)+rot mag=Rnd(3,10) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 4 ' 4 dirs dir=90*Rnd(0,4)+rot mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 5 ' 8 dirs dir=45*Rnd(0,8)+rot mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 6 ' any dir and speed mag=Rnd(0.5,2.0) _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag Case 7 ' random dir=Rnd(0,360) mag=Rnd(1,14) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag End 'Finalise _points[_index].dx=_points[_index].dx*1.5 _points[_index].dy=_points[_index].dy*1.5 _points[_index].x+=_points[_index].dx*size _points[_index].y+=_points[_index].dy*size 'Increment _index=(_index+1) Mod NumParticles End End Class Struct ParticlePoint Field x:Float=0.0 Field y:Float=0.0 Field dx:Float=0.0 Field dy:Float=0.0 Field r:Float=0 Field g:Float=0 Field b:Float=0 Field active:Int=0 Field style:Int=0 Method Update() x+=dx y+=dy If (x<=dx) dx=Abs(dx) x+=dx*2 End If(x>App.ActiveWindow.Width-1-dx) dx=-Abs(dx) x+=dx*2 End If (y<=dy) dy=Abs(dy) y+=dy*2 End If (y>App.ActiveWindow.Height-1-dy) dy=-Abs(dy) y+=dy*2 End dx*=ParticleDecay dy*=ParticleDecay active-=1 If (active<20) If (active<10) r=Max(r*0.8,0.0) g=Max(g*0.8,0.0) b=Max(b*0.8,0.0) Else r=Max(r*0.97,0.0) g=Max(g*0.97,0.0) b=Max(b*0.97,0.0) End Elseif (active>200) active=200 End End End Struct Function GetColor:Color(red:Float,green:Float,blue:Float) Return New Color(red/255,green/255,blue/255) End

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'----------------------------------------------------------------------- ' '  Based on BlitzMax code created by Mark Incitti ' '-----------------------------------------------------------------------   Namespace myapp   #Import "<std>" #Import "<mojo>"   Using std.. Using mojo..   #Import "particle.png" Global particleImage:Image   Const Size:=New Vec2i( 640,360 ) Const NumParticles:Int=2048 Const ParticleLife:Int=40 Const ParticleDecay:Float=0.95   Function Main() New AppInstance New MyWindow App.Run() End   Class MyWindow Extends Window   Private Field _particles:ParticleManager Field _style:Int=0 Public   Method New() 'Create window Super.New( "Particles!",640,480,WindowFlags.Fullscreen ) Layout="letterbox" ClearColor=New Color(0,0,0) Mouse.PointerVisible=True Style.BackgroundColor=GetColor(2,2,2) 'Load image particleImage=Image.Load("asset::particle.png",TextureFlags.Filter) particleImage.Handle=New Vec2f(0.5,0.5) 'Initialise particles _particles=New ParticleManager() 'Randomise SeedRnd(Millisecs())   End   Method OnRender( canvas:Canvas ) Override 'Features If (Keyboard.KeyHit(Key.P)) _style=(_style + 1) Mod 5 'Release particles? If(Rnd(0,100)>90) _particles.CreateFireWorks(0,_style) 'Update _particles.Update() 'Render App.RequestRender() _particles.Render(canvas) 'Text canvas.Color=Color.White canvas.DrawText("Style: "+_style,4,App.ActiveWindow.Height-40) canvas.DrawText("Press 'P' to change",4,App.ActiveWindow.Height-25) End Method OnKeyEvent( event:KeyEvent ) Override select event.Type Case EventType.KeyDown If ( event.Key=Key.Enter And event.Modifiers & Modifier.Alt ) Fullscreen=Not Fullscreen If ( event.Key=Key.Escape ) App.Terminate() End End Method OnMeasure:Vec2i() Override Return Size End End   Class ParticleManager   Private Field _points:ParticlePoint[] Field _index:Int=0 Public   Method New() 'Initialise _points=New ParticlePoint[NumParticles] End Method CreateParticles(x:Int,y:Int,style:Int=2,type:Int=0,particles:Int=32) 'Prepare Local r:Int=Rnd(0,4)*64 Local g:Int=Rnd(0,4)*64 Local b:Int=Rnd(0,4)*64   'Create Self.CreateParticles(x,y,style,type,r,g,b,particles) End   Method CreateParticles(x:Int,y:Int,style:Int=2,type:Int=0,r:Int,g:Int,b:Int,particles:Int=32) 'Create For Local t:Int=0 Until particles Self.Create(x,y,style,type,r,g,b) Next End Method CreateFireWorks(position:Int,style:Int=2,type:Int=0) 'Prepare Local x:Int,y:Int Local r:Int=Rnd(0,4)*64 Local g:Int=Rnd(0,4)*64 Local b:Int=Rnd(0,4)*64 'Randomise style? If (style>3) style=Int(Rnd(0,4)) 'Get location Select position Case 1 If (Rnd()>=0.5) x=Rnd(100,App.ActiveWindow.Width-100) y=16 If (Rnd()>=0.5) y=App.ActiveWindow.Height-16 Else y=Rnd(50,App.ActiveWindow.Height-50) x=16 If (Rnd()>=0.5) x=App.ActiveWindow.Width-16 End Case 2 x=App.ActiveWindow.Width/2 y=App.ActiveWindow.Height/2 Default x=Rnd(0,App.ActiveWindow.Width-100) y=Rnd(0,App.ActiveWindow.Height-50) End 'Create For Local t:Int=0 To 63 Self.Create(x,y,style,type,r,g,b) Next End Method Update() 'Process For Local t:Int=0 To NumParticles-1 If (_points[t].active>0) _points[t].Update() Next End Method Reset() 'Reset _index=0 For Local t:Int=0 To NumParticles-1 _points[t].x=0 _points[t].y=0 _points[t].r=0 _points[t].g=0 _points[t].b=0 _points[t].active=0 _points[t].dx=0 _points[t].dy=0 Next End Method Render(canvas:Canvas) Local r:Float,g:Float,b:Float 'Prepare canvas.BlendMode=BlendMode.Additive canvas.TextureFilteringEnabled=True 'Process For Local t:int=0 To NumParticles-1 If (_points[t].active>0) Select _points[t].style Case 0 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=2.0 canvas.Alpha=1.0 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) Case 1 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=3.0 canvas.Alpha=0.8 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) Case 2 'Get color r=Min(_points[t].r*1.5,255.0) g=Min(_points[t].g*1.5,255.0) b=Min(_points[t].b*1.5,255.0) canvas.Color=GetColor(r,g,b) 'Draw canvas.LineWidth=2.0 canvas.Alpha=1.0 canvas.DrawImage(particleImage,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy,0,0.5,0.5) Case 3 'BEST! 'Get color r=Min(_points[t].r*1.25,255.0) g=Min(_points[t].g*1.25,255.0) b=Min(_points[t].b*1.25,255.0) canvas.Color=GetColor(r,g,b) 'Draw (line) canvas.LineWidth=2.0 canvas.Alpha=0.8 canvas.DrawLine(_points[t].x,_points[t].y,_points[t].x+_points[t].dx,_points[t].y+_points[t].dy) 'Draw (image) canvas.Alpha=0.25 canvas.DrawImage(particleImage,_points[t].x+_points[t].dx*1.0,_points[t].y+_points[t].dy*1.0) End End Next 'Reset canvas.BlendMode=BlendMode.Alpha canvas.Alpha=1.0 canvas.LineWidth=1.0 End Private Method Create(x:Float,y:Float,style:Int,type:Int,r:Int,g:Int,b:Int,rot:Float=0.0,size:Int=1) 'Prepare Local dir:Float Local mag:Float 'Set particle _points[_index].x=x _points[_index].y=y _points[_index].r=r _points[_index].g=g _points[_index].b=b _points[_index].active=Rnd(ParticleLife-20,ParticleLife) _points[_index].style=style 'Validate Select type Case 0 'Random dir=Rnd(0,360) mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 1 mag=16 _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag _points[_index].active=24 Case 2 mag=8 _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag Case 3 ' 3 dirs dir=120*Rnd(0,3)+rot mag=Rnd(3,10) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 4 ' 4 dirs dir=90*Rnd(0,4)+rot mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 5 ' 8 dirs dir=45*Rnd(0,8)+rot mag=Rnd(3,11) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag Case 6 ' any dir and speed mag=Rnd(0.5,2.0) _points[_index].dx=Cos(rot)*mag _points[_index].dy=Sin(rot)*mag Case 7 ' random dir=Rnd(0,360) mag=Rnd(1,14) _points[_index].dx=Cos(dir)*mag _points[_index].dy=Sin(dir)*mag End 'Finalise _points[_index].dx=_points[_index].dx*1.5 _points[_index].dy=_points[_index].dy*1.5 _points[_index].x+=_points[_index].dx*size _points[_index].y+=_points[_index].dy*size 'Increment _index=(_index+1) Mod NumParticles End End Class   Struct ParticlePoint Field x:Float=0.0 Field y:Float=0.0 Field dx:Float=0.0 Field dy:Float=0.0 Field r:Float=0 Field g:Float=0 Field b:Float=0 Field active:Int=0 Field style:Int=0 Method Update() x+=dx y+=dy If (x<=dx) dx=Abs(dx) x+=dx*2 End If(x>App.ActiveWindow.Width-1-dx) dx=-Abs(dx) x+=dx*2 End If (y<=dy) dy=Abs(dy) y+=dy*2 End If (y>App.ActiveWindow.Height-1-dy) dy=-Abs(dy) y+=dy*2 End dx*=ParticleDecay dy*=ParticleDecay active-=1 If (active<20) If (active<10) r=Max(r*0.8,0.0) g=Max(g*0.8,0.0) b=Max(b*0.8,0.0) Else r=Max(r*0.97,0.0) g=Max(g*0.97,0.0) b=Max(b*0.97,0.0) End Elseif (active>200) active=200 End End   End Struct   Function GetColor:Color(red:Float,green:Float,blue:Float) Return New Color(red/255,green/255,blue/255) End

Attachments:

1. 

   particle.png
   

[Matthew SmithParticipant]

Cleaned it up a little more.

[Author]

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