Change bitmap brightness and contrast behaviour

 

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Changes bitmap brightness and contrast

---------------------------> Information about this behaviour -- [S] Change bitmap brightness and contrast behaviour -- Behaviour written by Barry Swan -- E-mail: gerbil@theburrow.co.uk -- WWW:    http://www.theburrow.co.uk ---------------------------> Property definitions for the behaviour property pSN, pS property pOldInk, pOldBGColor, pOldColor property pBrightness property pContrast property pOldBrightness property pOldContrast ---------------------------> Initialise the sprite and properties on beginSprite me      -- Set up sprite properties   pSN = me.spriteNum   pS = sprite(pSN)   pOldInk = pS.ink   pOldBGColor = pS.bgcolor   pOldColor = pS.color      -- Set to use darken ink   pS.ink = 41      -- Set up behaviour properties (to guarantee a refresh on the first prepareFrame)   pOldBrightness = -1   pOldContrast = -1    end ---------------------------> Check for values being changed - if so update sprite on prepareFrame me      -- Change sprite if brightness or contrast has changed   if pBrightness <> pOldBrightness OR pContrast <> pOldContrast then     me.UpdateBrightnessAndContrast()          -- Store current values     pOldBrightness = pBrightness     pOldContrast = pContrast   end if    end ---------------------------> The actual handler to change the sprite values on UpdateBrightnessAndContrast me      -- Apply brightness   tBGBrightness = min(pBrightness * 256 / 100, 256)   tFGBrightness = max(((pBrightness - 100) * 256 / 100), 0)      -- Apply contrast     tBGBrightness = tBGBrightness * pContrast / 100   tFGBrightness = tFGBrightness + (127 - tFGBrightness) * (100 - pContrast) / 100      -- Set sprite values   pS.bgcolor = rgb(tBGBrightness, tBGBrightness, tBGBrightness)   pS.color = rgb(tFGBrightness, tFGBrightness, tFGBrightness)    end ---------------------------> Reset the sprite when finished on endSprite me      -- Restore the old ink   pS.ink = pOldInk   pS.bgcolor = pOldBGColor   pS.color = pOldColor    end ---------------------------> Input the initial property values on getPropertyDescriptionList me      -- Set up list   tlData = [:]      -- Options for brightness   tlData[#pBrightness] = [¬       #format: #integer,¬       #default: 100,¬       #range: [#min: 0, #max: 200],¬       #comment: "Brightness (measured in percentage with 100% being no change):"¬   ]      -- Options for contrast   tlData[#pContrast] = [¬       #format: #integer,¬       #default: 100,¬       #range: [#min: 0, #max: 100],¬       #comment: "Contrast (measured in percentage with 100% being no change):"¬   ]      -- Return list   return tlData    end ---------------------------> Description of the behaviour in the behaviour inspector on getBehaviorDescription me      -- Create description string   tInfo = "[S] Change bitmap brightness and contrast behaviour" & RETURN & RETURN      tInfo = tInfo & "Behaviour by Barry Swan" & RETURN   tInfo = tInfo & "E-mail: gerbil@theburrow.co.uk" & RETURN   tInfo = tInfo & "www:    www.theburrow.co.uk" & RETURN & RETURN      tInfo = tInfo & "Drop this behaviour onto a bitmap sprite to alter it's brightness and contrast without altering the graphic itself." & RETURN   tInfo = tInfo & "Note that it uses the DARKEN ink. Therefore it will override the ink setting for the sprite in the score." & RETURN   tInfo = tInfo & "The DARKEN ink has transparency identical to MATTE ink." & RETURN & RETURN      tInfo = tInfo & "Parameters are:" & RETURN & RETURN      tInfo = tInfo & "Brightness - measured as a percentage with 100% being normal. 0% is darkest, 200% is lightest." & RETURN   tInfo = tInfo & "Contrast - measured as a percentage with 100% being normal. 0% is no contrast." & RETURN & RETURN      tInfo = tInfo & "You can change the properties and the behaviour will automatically update the graphic to represent the new values." & RETURN   tInfo = tInfo & "To alter brightness change the 'pBrightness' property of the behaviour." & RETURN   tInfo = tInfo & "To alter contrast change the 'pContrast' property of the behaviour."      -- Return string   return tInfo    end