function calculateScore()

in Canvas/CanvasSimple/lib/winjs-4.0.1/js/base.js [12923:13002]
80 lines of code
20 McCabe index (conditional complexity)

        function calculateScore(direction, maxDistance, historyRect, referenceRect, potentialRect) {
            var score = 0;
            var percentInShadow;
            var primaryAxisDistance;
            var secondaryAxisDistance = 0;
            var percentInHistoryShadow = 0;
            switch (direction) {
                case DirectionNames.left:
                    // Make sure we don't evaluate any potential elements to the right of the reference element
                    if (potentialRect.left >= referenceRect.left) {
                        break;
                    }
                    percentInShadow = calculatePercentInShadow(referenceRect.top, referenceRect.bottom, potentialRect.top, potentialRect.bottom);
                    primaryAxisDistance = referenceRect.left - potentialRect.right;
                    if (percentInShadow > 0) {
                        percentInHistoryShadow = calculatePercentInShadow(historyRect.top, historyRect.bottom, potentialRect.top, potentialRect.bottom);
                    }
                    else {
                        // If the potential element is not in the shadow, then we calculate secondary axis distance
                        secondaryAxisDistance = (referenceRect.bottom <= potentialRect.top) ? (potentialRect.top - referenceRect.bottom) : referenceRect.top - potentialRect.bottom;
                    }
                    break;
                case DirectionNames.right:
                    // Make sure we don't evaluate any potential elements to the left of the reference element
                    if (potentialRect.right <= referenceRect.right) {
                        break;
                    }
                    percentInShadow = calculatePercentInShadow(referenceRect.top, referenceRect.bottom, potentialRect.top, potentialRect.bottom);
                    primaryAxisDistance = potentialRect.left - referenceRect.right;
                    if (percentInShadow > 0) {
                        percentInHistoryShadow = calculatePercentInShadow(historyRect.top, historyRect.bottom, potentialRect.top, potentialRect.bottom);
                    }
                    else {
                        // If the potential element is not in the shadow, then we calculate secondary axis distance
                        secondaryAxisDistance = (referenceRect.bottom <= potentialRect.top) ? (potentialRect.top - referenceRect.bottom) : referenceRect.top - potentialRect.bottom;
                    }
                    break;
                case DirectionNames.up:
                    // Make sure we don't evaluate any potential elements below the reference element
                    if (potentialRect.top >= referenceRect.top) {
                        break;
                    }
                    percentInShadow = calculatePercentInShadow(referenceRect.left, referenceRect.right, potentialRect.left, potentialRect.right);
                    primaryAxisDistance = referenceRect.top - potentialRect.bottom;
                    if (percentInShadow > 0) {
                        percentInHistoryShadow = calculatePercentInShadow(historyRect.left, historyRect.right, potentialRect.left, potentialRect.right);
                    }
                    else {
                        // If the potential element is not in the shadow, then we calculate secondary axis distance
                        secondaryAxisDistance = (referenceRect.right <= potentialRect.left) ? (potentialRect.left - referenceRect.right) : referenceRect.left - potentialRect.right;
                    }
                    break;
                case DirectionNames.down:
                    // Make sure we don't evaluate any potential elements above the reference element
                    if (potentialRect.bottom <= referenceRect.bottom) {
                        break;
                    }
                    percentInShadow = calculatePercentInShadow(referenceRect.left, referenceRect.right, potentialRect.left, potentialRect.right);
                    primaryAxisDistance = potentialRect.top - referenceRect.bottom;
                    if (percentInShadow > 0) {
                        percentInHistoryShadow = calculatePercentInShadow(historyRect.left, historyRect.right, potentialRect.left, potentialRect.right);
                    }
                    else {
                        // If the potential element is not in the shadow, then we calculate secondary axis distance
                        secondaryAxisDistance = (referenceRect.right <= potentialRect.left) ? (potentialRect.left - referenceRect.right) : referenceRect.left - potentialRect.right;
                    }
                    break;
            }
            if (primaryAxisDistance >= 0) {
                // The score needs to be a positive number so we make these distances positive numbers
                primaryAxisDistance = maxDistance - primaryAxisDistance;
                secondaryAxisDistance = maxDistance - secondaryAxisDistance;
                if (primaryAxisDistance >= 0 && secondaryAxisDistance >= 0) {
                    // Potential elements in the shadow get a multiplier to their final score
                    primaryAxisDistance += primaryAxisDistance * percentInShadow;
                    score = primaryAxisDistance * ScoringConstants.primaryAxisDistanceWeight + secondaryAxisDistance * ScoringConstants.secondaryAxisDistanceWeight + percentInHistoryShadow * ScoringConstants.percentInHistoryShadowWeight;
                }
            }
            return score;
        }