Image Magnify

 

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Magnifies an image

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-- Image Magnification Behaviour -- by Barry Swan (gerbil@theburrow.co.uk) --  & Ben Pitt   (ben@robotduck.com) -- August 2000 property plGrid property pGridSize property pSize property pLoc property pFishEye property pZoom property pMovement property pFirstSN property pSampleAreaSize property facetsize,stage_snapshot,my on beginSprite me      -- Set up grid points      tHalfGrid = pGridSize / 2.0   tMaxScalar = mDistance(tHalfGrid, tHalfGrid)        plGrid = []   repeat with x = 0 to pGridSize     tX = x - tHalfGrid          tlRow = []     repeat with y = 0 to pGridSize       tY = y - tHalfGrid              tAngle = me.mAngle(tX, tY)       tDistance = me.mDistance(tX, tY)              tScalar = tDistance / tMaxScalar       repeat with a = 1 to pFishEye         tScalar = sin(tScalar)       end repeat              tlRow.add([sin(tAngle / 180.0 * pi()) * tScalar, cos(tAngle / 180.0 * pi()) * tScalar])     end repeat              plGrid.add(tlRow.duplicate())   end repeat      -- Scale grid points      tSizeScalar = me.mDistance(plGrid[1][pGridSize / 2 + 1][1], plGrid[1][pGridSize / 2 + 1][2])      repeat with y = 1 to pGridSize + 1     repeat with x = 1 to pGridSize + 1       plGrid[x][y] = plGrid[x][y] / tSizeScalar     end repeat   end repeat      my = sprite(me.spriteNum)      stage_snapshot = the stage.image.duplicate()   facetsize = pSampleAreaSize/pGridSize    end on prepareFrame me         -- Control movement      if pMovement = #fixedtocursor then my.loc = the mouseLoc      -- Draw magnifying area      s = psampleareasize   area_under_lens = image(s,s,stage_snapshot.depth)   srcrect = rect(my.Loc - point(s/2, s/2), my.Loc + point(s/2, s/2))   destrect = rect(0,0,s,s)   area_under_lens.copyPixels(stage_snapshot, destRect, srcrect,[])      s = abs(psize)*2   lens = image(s,s,stage_snapshot.depth)   srcrect = rect(my.Loc - point(s/2, s/2), my.Loc + point(s/2,s/2))   destrect = rect(0,0,s,s)   lens.copyPixels(stage_snapshot, destRect, srcrect,[])         repeat with y = 1 to pGridSize     repeat with x = 1 to pGridSize              tX1 = integer((plGrid[x][y][1]*pSize)-psize)       tY1 = integer((plGrid[x][y][2]*pSize)-psize)       tX2 = integer((plGrid[x + 1][y][1] * pSize)-psize)       tY2 = integer((plGrid[x + 1][y][2] * pSize)-psize)       tX3 = integer((plGrid[x + 1][y + 1][1] * pSize)-psize)       tY3 = integer((plGrid[x + 1][y + 1][2] * pSize)-psize)       tX4 = integer((plGrid[x][y + 1][1] * pSize)-psize)       tY4 = integer((plGrid[x][y + 1][2] * pSize)-psize)              srcrect = rect((x-1)*facetsize,(y-1)*facetsize,x*facetsize,y*facetsize)       destquad = [point(tX1, tY1), point(tX2, tY2), point(tX3, tY3), point(tX4, tY4)]              lens.copypixels(area_under_lens,destquad,srcrect,[])            end repeat   end repeat      my.member.image = lens    end on mAngle me, tDX, tDY      -- Calculate angle      if tDY = 0 then     if tDX > 0 then tAngle = 0     else tAngle = 180   else if tDX = 0 then     if tDY > 0 then tAngle = 90     else tAngle = 270   else     tAngle = integer(atan(tDY / tDX) / pi() * 180.0)     if tDX * tDY < 0 then tAngle = tAngle + 180     if tDY < 0 then tAngle = tAngle + 180   end if      -- Orientate angle and clip within range 0 -> 360      tAngle = (630 - tAngle) mod 360      -- Return the angle      return tAngle    end on mDistance me, tDX, tDY      -- Calculate distance      return sqrt(tDX * tDX + tDY * tDY)    end on getPropertyDescriptionList me      tlData = [:]      tlData[#pZoom] = [#format: #float, #default: 2.0, #comment: "How much to zoom (is a scalar dependant on fisheye effect):"]   tlData[#pFishEye] = [#format: #integer, #default: 20, #range: [#min: 0, #max: 100], #comment: "Fisheye effect strength (0 = none, 100 = very strong):"]   tlData[#pGridSize] = [#format: #integer, #default: 5, #range: [#min: 3, #max: 10], #comment: "Resolution of grid effect"]   tlData[#pSize] = [#format: #integer, #default: -100, #comment: "RADIUS of bounding circle of magnifying area in pixels"]   tlData[#pSampleAreaSize] = [#format: #integer, #default: 100, #comment: "size of sampling area (edge length of square in pixels)"]   tlData[#pMovement] = [#format: #symbol, #default: #fixedtocursor, #range: [#fixedtocursor, #stationary], #comment: "Movement of magnifying section:"]     return tlData   end