Generic rendering routines

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SoCoder -> Snippet Home -> Graphical Effects

Teasy	Created : 30 January 2011 Edited : 30 January 2011 System : Windows Language : Blitz Generic rendering routines Handy text routines, RGB modification and HSL conversion, and some custom Rect/Oval functions.
;------------------------------------------------------------------------------- ; * Generic rendering routines ; Version 2010 Jan 18 Rev 00 ;------------------------------------------------------------------------------- ;------------------------------------------------------------------------------- ; Draw (optional) colorized text with (optional) outline ;------------------------------------------------------------------------------- Function ColorText( x,y , Text$ , CenterX=0,CenterY=0 , outr=-1,outg=-1,outb=-1 , separation=1 , br#=1.0,bg#=1.0,bb#=1.0 ) ;------------------------------------------------------------------------------- ; * Sep 2006 ; - Supports `rrrgggbbb ; - Added CenterX,CenterY (0,1,2) ; - Takes into account rgb command ; - Current color is recalled when no default color is set ; - Added variable width font support by stripping rgb command ; - Added outr=-x value for using rgb/x as outline color (goes for each outr,outg,outb) ; for example -2 means use half rgb for outline color ; * Oct 2006 ; - Added br,bg,bb: global brightness (0..1) ; - Optimizing: Draw per color section (skip to next `) ; * Algorithm ; PrevCharNum = 1 ; Repeat ; CharNum = Instr( Text , "`" , PrevCharNum ) ; ; found a next color header ; If CharNum > 0 ; ; grab (actual) text inbetween previous and next color header ; Section = Mid( Text , PrevCharNum , CharNum-PrevCharNum ) ;"`123456789abc`123456789" 11,14->11,3 ; * DRAW (with offset advance) ; * COLOR (with string parsing) ; CharNum = CharNum + 3+3+3+1 ; skip over `rrrgggbbb at next char ; PrevCharNum = CharNum ; ; didn't find a next color header ; Else ; ; still something left to draw (tail) ; If PrevCharNum <= Length ; Section = Mid( Text , PrevCharNum , Length-PrevCharNum+1 ) ;"abc`123456789abc" 14,16->14,3 ; * DRAW ; EndIf ; ; all done ; Exit ; EndIf ; Forever ; - Fixed original color ability ; you can write something without color header, using current color, e.g. outside of function ;------------------------------------------------------------------------------- Local CharNum,Char$,Length Local r,g,b,ox,oxb,oy Local Raw$,outdiv Local Section$,PrevCharNum Local startr,startg,startb ; precalc length and set default color Length = Len( Text ) startr = ColorRed() * br startg = ColorGreen() * bg startb = ColorBlue() * bb ; Strip `rrrgggbbb PrevCharNum = 1 Repeat CharNum = Instr( Text , "`" , PrevCharNum ) ; found a next color header If CharNum > 0 ; grab (actual) text inbetween previous and next color header Raw = Raw + Mid( Text , PrevCharNum , CharNum-PrevCharNum ) CharNum = CharNum + 3+3+3+1 ; skip over `rrrgggbbb at next char PrevCharNum = CharNum ; didn't find a next color header Else ; still something left to draw (tail) If PrevCharNum <= Length Raw = Raw + Mid( Text , PrevCharNum , Length-PrevCharNum+1 ) EndIf ; all done Exit EndIf Forever ; CenterX: 0 = Left justify, 1 = Center, 2 = Right justify If CenterX = 2 ox = -StringWidth( Raw ) ElseIf CenterX = 1 ox = -StringWidth( Raw ) / 2 Else ox = 0 EndIf ; CenterY: 0 = Top justify, 1 = Center, 2 = Bottom justify If CenterY = 2 oy = -StringHeight( Raw ) ElseIf CenterY = 1 oy = -StringHeight( Raw ) / 2 Else oy = 0 EndIf ; Format and render outline (if used) If outr <> -1 ; use default color r = startr g = startg b = startb ; offset x background (increased per section) oxb = ox PrevCharNum = 1 Repeat CharNum = Instr( Text , "`" , PrevCharNum ) ; found a next color header If CharNum > 0 ; grab (actual) text inbetween previous and next color header ; "`123456789abc`123456789" 11,14->11,3 Section = Mid( Text , PrevCharNum , CharNum-PrevCharNum ) ; specific color If outr > -1 ; Draw outline only (if specified) TextSpread oxb+x,oy+y , Section , False,False , outrbr,outgbg,outbbb , separation ; division of current color ElseIf outr < -1 ; Draw outline only (using rgb/-x) ;TextSpread oxb+x,oy+y , Section , False,False , (r/Float -outr)br,(g/Float -outg)bg,(b/Float -outb)bb , separation TextSpread oxb+x,oy+y , Section , False,False , (r/-outr)br,(g/-outg)bg,(b/-outb)bb , separation EndIf oxb = oxb + StringWidth( Section ) If outr < -1 r = Mid( Text , CharNum+1,3 ) ; `rrr000000 g = Mid( Text , CharNum+4,3 ) ; `000ggg000 b = Mid( Text , CharNum+7,3 ) ; `000000bbb Color rbr,gbg,bbb EndIf ; skip over `rrrgggbbb at next char CharNum = CharNum + 3+3+3+1 PrevCharNum = CharNum ; didn't find a next color header Else ; still something left to draw (tail) If PrevCharNum <= Length ;"abc`123456789abc" 14,16->14,3 Section = Mid( Text , PrevCharNum , Length-PrevCharNum+1 ) If outr > -1 ; Draw outline only (if specified) TextSpread oxb+x,oy+y , Section , False,False , outrbr,outgbg,outbbb , separation ElseIf outr < -1 ; Draw outline only (using rgb/-x) ;TextSpread oxb+x,oy+y , Section , False,False , (r/Float -outr)br,(g/Float -outg)bg,(b/Float -outb)bb , separation TextSpread oxb+x,oy+y , Section , False,False , (r/-outr)br,(g/-outg)bg,(b/-outb)bb , separation EndIf EndIf ; all done Exit EndIf Forever EndIf ; use default color r = startr g = startg b = startb Color r,g,b ; Format and render overlay (front) PrevCharNum = 1 Repeat CharNum = Instr( Text , "`" , PrevCharNum ) ; found a next color header If CharNum > 0 ; grab (actual) text inbetween previous and next color header ; "`123456789abc`123456789" 11,14->11,3 Section = Mid( Text , PrevCharNum , CharNum-PrevCharNum ) Text ox+x,oy+y , Section ox = ox + StringWidth( Section ) r = Mid( Text , CharNum+1,3 ) ; `rrr000000 g = Mid( Text , CharNum+4,3 ) ; `000ggg000 b = Mid( Text , CharNum+7,3 ) ; `000000bbb Color rbr,gbg,bbb ; skip over `rrrgggbbb at next char CharNum = CharNum + 3+3+3+1 PrevCharNum = CharNum ; didn't find a next color header Else ; still something left to draw (tail) If PrevCharNum <= Length ; "abc`123456789abc" 14,16->14,3 Section = Mid( Text , PrevCharNum , Length-PrevCharNum+1 ) Text ox+x,oy+y , Section EndIf ; all done Exit EndIf Forever ;------------------------------------------------------------------------------- End Function ;------------------------------------------------------------------------------- ; Like Text() only with fixed width characters Function CharText( x,y , msg$ , cx=False,cy=False , r=-1,g=-1,b=-1 , ccw=-1,cch=-1 ) ; ccw,cch: (optional) custom char width/height Local cw,ch Local length,char If ccw = -1 cw = StringWidth( "A" ) Else cw = ccw EndIf If cch = -1 ch = StringHeight( "A" ) Else ch = cch EndIf length = Len( msg ) ; draw all chars from middle of char x = x + cw / 2 y = y + ch / 2 ; CenterX: 0 = Left justify, 1 = Center, 2 = Right justify If cx = 2 x = x - cw * length;StringWidth( msg ) ElseIf cx = 1 x = x - cw * length / 2;StringWidth( msg ) / 2 EndIf ; CenterY: 0 = Top justify, 1 = Center, 2 = Bottom justify If cy = 2 y = y - ch;StringHeight( msg ) ElseIf cy = 1 y = y - ch / 2;StringHeight( msg ) / 2 EndIf If b > -1 Color r,g,b EndIf For char = 1 To length Text x,y , Mid( msg , char,1 ) , True,True x = x + cw Next End Function ; Like Text() only with 3x3 outline, for example to make white text visible on white background Function TextOutLine( PosX%,PosY% , Message$ , CenterX=False,CenterY=False , InR=255,InG=255,InB=255 , OutR=0,OutG=0,OutB=0 , Separation=1 ) ; 09 sep 2007: ; - swapped inner/outer color (inner color is now white, outer is black) Local X% Local Y% Color OutR,OutG,OutB ; CenterX: 0 = Left justify, 1 = Center, 2 = Right justify If CenterX = 2 PosX = PosX - StringWidth( Message ) CenterX = False EndIf ; CenterY: 0 = Top justify, 1 = Center, 2 = Bottom justify If CenterY = 2 PosY = PosY - StringHeight( Message ) CenterY = False EndIf For X = -1 To 1 For Y = -1 To 1 Text PosX + X * Separation , PosY + Y * Separation , Message , CenterX , CenterY Next Next Color InR,InG,InB Text PosX,PosY , Message , CenterX,CenterY End Function ; Like TextOutline() only with 1 color Function TextSpread( PosX%,PosY% , Message$ , CenterX=False,CenterY=False , R=255,G=0,B=0 , Separation=1 ) Local X% Local Y% Color R,G,B ; CenterX: 0 = Left justify, 1 = Center, 2 = Right justify If CenterX = 2 PosX = PosX - StringWidth( Message ) CenterX = False EndIf ; CenterY: 0 = Top justify, 1 = Center, 2 = Bottom justify If CenterY = 2 PosY = PosY - StringHeight( Message ) CenterY = False EndIf For X = -1 To 1 For Y = -1 To 1 Text PosX + X * Separation , PosY + Y * Separation , Message , CenterX , CenterY Next Next End Function ; A filled and shaded rectangle with upper-left light and lower-right darkness Function DrawBevel( x,y , w,h , r,g,b , bright#=1.0,medium#=0.7,dark#=0.4 ) Local br,bg,bb Local mr,mg,mb Local dr,dg,db br=rbright:bg=gbright:bb=bbright mr=rmedium:mg=gmedium:mb=bmedium dr=rdark :dg=gdark :db=bdark Color mr,mg,mb Rect x+1,y+1 , w-2,h-2 , True Plot x,y+h-1 Plot x+h-1,y Color br,bg,bb Rect x,y , w-1,1 , True Rect x,y , 1,h-1 , True Color dr,dg,db Rect x+1,y+h-1 , w-1,1 , True Rect x+w-1,y+1 , 1,h-1 , True End Function ; Draw a normal Rect, only with extra outline around/inside it Function RectOutline( x,y , w,h , solid=False , fr=-1,fg=-1,fb=-1 , br=-1,bg=-1,bb=-1 ) ; x,y: start location ; w,h: width,height ; solid: draw filled or frame ; fr,fg,fb: foreground (inside) red,green,blue ; br,bg,bb: background (outline) red,green,blue ; background (outline) is not drawn if back color not specified ; if foreground color is not specified, current color is used Local usefront,useback Local r,g,b usefront = fr >= 0 And fg >= 0 And fb >= 0 useback = br >= 0 And bg >= 0 And bb >= 0 ; back color specified If useback ; front color NOT specified If Not usefront ; remember current (front) color r = ColorRed() g = ColorGreen() b = ColorBlue() ; draw back (outline) Color br,bg,bb Rect x,y , w,h , False ; draw inner outline if not solid If Not solid Rect x+2,y+2 , w-4,h-4 , False EndIf ; recall front color Color r,g,b ; front color specified Else ; draw back (outline) Color br,bg,bb Rect x,y , w,h , False ; draw inner outline if not solid If Not solid Rect x+2,y+2 , w-4,h-4 , False EndIf ; select front color Color fr,fg,fb EndIf ; back color NOT specified -> don't draw Else ; front color specified If usefront ; select front color Color fr,fg,fb EndIf EndIf ; draw front Rect x+1,y+1 , w-2,h-2 , solid End Function ; Same as RectOutline, only with Oval Function OvalOutline( x,y , w,h , solid=False , fr=-1,fg=-1,fb=-1 , br=-1,bg=-1,bb=-1 ) Local usefront,useback Local r,g,b usefront = fr >= 0 And fg >= 0 And fb >= 0 useback = br >= 0 And bg >= 0 And bb >= 0 If useback If Not usefront r = ColorRed() g = ColorGreen() b = ColorBlue() Color br,bg,bb Oval x,y , w,h , False If Not solid Oval x+2,y+2 , w-4,h-4 , False EndIf Color r,g,b Else Color br,bg,bb Oval x,y , w,h , False If Not solid Oval x+2,y+2 , w-4,h-4 , False EndIf Color fr,fg,fb EndIf Else If usefront Color fr,fg,fb EndIf EndIf Oval x+1,y+1 , w-2,h-2 , solid End Function ;------------------------------------------------------------------------------- ; RGB color objects ;------------------------------------------------------------------------------- Type RGB Field r,g,b End Type Function NewRGB.RGB( r=0,g=0,b=0 ) Local p.RGB p = New RGB p\r = r p\g = g p\b = b Return p End Function Function SetRGB( p.RGB , r,g,b ) p\r = r p\g = g p\b = b End Function Function CopyRGB( source.RGB , target.RGB ) target\r = source\r target\g = source\g target\b = source\b End Function Function DeltaRGB( start.RGB,finish.RGB , delta#=0.5 ) Local r,g,b r = start\r + (finish\r - start\r) delta g = start\g + (finish\g - start\g) * delta b = start\b + (finish\b - start\b) * delta Return RGB( r,g,b ) End Function Function GetRGB( p.RGB ) Return RGB( p\r,p\g,p\b ) End Function ;------------------------------------------------------------------------------- ; RGB binary color conversion ;------------------------------------------------------------------------------- ; Combine Red, Green and Blue color components into a 3-byte RGB integer Function RGB( Red,Green,Blue ) Return Red Shl 16 Or Green Shl 8 Or Blue End Function ; Extract individual color component from combined 3-byte RGB Function Red( RGB ) Return RGB Shr 16 And 255 End Function Function Green( RGB ) Return RGB Shr 8 And 255 End Function Function Blue( RGB ) Return RGB And 255 End Function ;------------------------------------------------------------------------------- ; RGB / HSL color conversion ;------------------------------------------------------------------------------- ; Usage: ; ; convert RGB to HSL ; RGB_HSL 0,0,255 ; ; Print "Hue: "+hsl_h+" (flavor)" ; Print "Saturation: "+hsl_s+" (intensity)" ; Print "Light: "+hsl_l+" (exposure)" ; ; ; convert HSL to RGB ; HSL_RGB hsl_h,hsl_s,hsl_l ; ; Print ; Print "Red: "+rgb_r ; Print "Green: "+rgb_g ; Print "Blue: "+rgb_b ; ; WaitKey ; End ;------------------------------------------------------------------------------- ; Summary: ; Function RGB_HSL( red,green,blue ) ; Modifies HSL_H#, HSL_S#, HSL_L# ; ; Function HSL_RGB( hue,satura,light ) ; Modifies RGB_R, RGB_G, RGB_B ;------------------------------------------------------------------------------- ; HSL color examples: ; Hue (flavor): ; 0.0 / 3 - red - 255 , 0 , 0 ; 0.5 / 3 - yellow - 255 , 255 , 0 ; 1.0 / 3 - green - 0 , 255 , 0 ; 1.5 / 3 - cyan - 0 , 255 , 255 ; 2.0 / 3 - blue - 0 , 0 , 255 ; 2.5 / 3 - purple - 255 , 0 , 255 ; 3.0 / 3 - red - 255 , 0 , 0 ; Saturation (intensity): ; 0.0 - 0% - no flavor (grey) ; 0.5 - 50% - half flavor (50% grey) ; 1.0 - 100% - full flavor (no grey) ; Luminance / Light (exposure): ; 0.0 - dark (black) ; 0.25 - half brightness (50%) ; 0.5 - full brightness (100%) ; 0.75 - 50% over-exposed (grey) ; 1.0 - 100% over-exposed (white) ;------------------------------------------------------------------------------- Global HSL_H# ; hue (color flavor: 0..1) Global HSL_S# ; saturation (flavor intensity: 0..1) Global HSL_L# ; light (exposure level: 0..1) Function RGB_HSL( Red,Green,Blue ) ; Param Red: 0..255 ; Param Green: 0..255 ; Param Blue: 0..255 Local r#,g#,b# Local min#,max#,dif# Local r2#,g2#,b2# ; scale to 0..1 r = Red / 255. g = Green / 255. b = Blue / 255. ; find minimum min = r If g < min min = g EndIf If b < min min = b EndIf ; find maximum max = r If g > max max = g EndIf If b > max max = b EndIf ; find difference between minimum and maximum dif = max - min ; light level HSL_L = ( max + min ) / 2. ; no flavor If dif = 0. HSL_H = 0. HSL_S = 0. ; any flavor Else ; determine saturation ; - light level below 50% If HSL_L < 0.5 HSL_S = dif / ( max + min ) ; - light level above 50% Else HSL_S = dif / ( 2. - max - min ) EndIf ; determine hue ; - red is maximum If r = max HSL_H = (g - b) / dif / 6. ; - green is maximum ElseIf g = max HSL_H = 1./3. + (b - r) / dif / 6. ; - blue is maximum ElseIf b = max HSL_H = 2./3. + (r - g) / dif / 6. EndIf EndIf End Function Global RGB_R Global RGB_G Global RGB_B Function HSL_RGB( Hue#,Satura#,Light# ) ; Param Hue: color flavor (0..1) ; Param Satura: flavor intensity (0..1) ; Param Light: exposure level (0..1) Local low#,high# ; no flavor If Satura = 0. RGB_R = Light * 255. RGB_G = Light * 255. RGB_B = Light * 255. ; any flavor Else ; high level ; - light level below 50% If Light < 0.5 high = Light * (1. + Satura) ; - light level above 50% Else high = (Light + Satura) - (Satura * Light) EndIf ; low level low = 2. * Light - high ; color level RGB_R = HSL_RGB_Hue( low,high , Hue + 1./3. ) * 255. RGB_G = HSL_RGB_Hue( low,high , Hue ) * 255. RGB_B = HSL_RGB_Hue( low,high , Hue - 1./3. ) * 255. EndIf End Function ; sub-routine Function HSL_RGB_Hue#( low# , high# , hue# ) If hue < 0. hue = hue + 1. ElseIf hue > 1. hue = hue - 1. EndIf If 6. * hue < 1. Return low + (high-low) * hue * 6. ElseIf 2. * hue < 1. Return high ElseIf 3. * hue < 2. Return low + (high-low) * (2./3. - hue) * 6. Else Return low EndIf End Function --v

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Generic rendering routines

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