Using LC 8.1.3, I just found a bug in the Matrix Multiply function. Could you check if this bug was fixed in more recent versions of LC?
Follow this recipe to reproduce this bug: 1) Create a new stack with a button, a text field and a check box named "showbug" 2) paste these two lines into the text field: TM 1,0.6,-1.2,1,40,10 CO 0,30 You could find this and other examples in this webpage: https://stackoverflow.com/documentation/svg/3249/transformation#t=20170730054300495488 3) paste this script into the button: ---------------------------------------------------------------- local tMatrix1 local tMatrix2 on mouseUp put empty into tMatrix1 put empty into tMatrix2 put empty into tNewMatrix put empty into tNewCoordinatePoint put fld 1 into tMatrixList repeat for each line tMX in tMatrixList switch word 1 of tMX case TM TransformTMatrix(word 2 of tMX) break case CO CoordinatePointMatrix(word 2 of tMX) break end switch end repeat put matrixMultiply(tMatrix1, tMatrix2) into tNewMatrix combine tNewMatrix with comma answer item 1 to 2 of tNewMatrix end mouseUp on TransformTMatrix pArgs local tA local tB local tC local tD local tE local tF local tMatrix if the hilite of btn "showbug" then put item 1 of pArgs into tA put item 2 of pArgs into tB put item 3 of pArgs into tC put item 4 of pArgs into tD else -- use a workaround put item 1 of pArgs into tA put item 2 of pArgs into tC -- change position put item 3 of pArgs into tB -- change position put item 4 of pArgs into tD end if put tA into tMatrix[0,0] put tB into tMatrix[0,1] put tC into tMatrix[1,0] put tD into tMatrix[1,1] if (the number of items in pArgs) is 6 then put item 5 of pArgs into tE put item 6 of pArgs into tF else put 0 into tE put 0 into tF end if put tE into tMatrix[0,2] put tF into tMatrix[1,2] put 0 into tMatrix[2,0] put 0 into tMatrix[2,1] put 1 into tMatrix[2,2] if tMatrix1 is empty then put tMatrix into tMatrix1 return empty end if end TransformTMatrix on CoordinatePointMatrix tArgs put item 1 of tArgs into tG put item 2 of tArgs into tH put tG into tCoordinatePoint[0,0] put tH into tCoordinatePoint[1,0] put 1 into tCoordinatePoint[2,0] if tMatrix1 is empty then put tCoordinatePoint into tMatrix1 return empty end if if tMatrix2 is empty then put tCoordinatePoint into tMatrix2 return empty end if end CoordinatePointMatrix ---------------------------------------------------------------- 4) Hilite the check box "showbug" and click the button... the result is 58,40 This result is wrong. 5) Unhilite the check box "showbug" and click the button... the result is 4,40 This result is correct. If this bug is still present in more recent LC versions. Could you report it to the Quality Center? Thanks in advance! Al _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
