Retrieving the amount of scaling from the Canvas Scaler (Unity)

Question

I am currently working on a healthbar which slowly drains the less health you have. I followed this tutorial to get the healthbars I wanted: https://www.youtube.com/watch?v=NgftVg3idB4

In short, it uses a mask layer and a seperate green bar to indicate the amount of health. By moving the green bar to the left, it disappears behind the mask layer and thus shows less and less health. The method to calculate its position based on the amount of health is here: Code (CSharp):

float maxXValue = healthTransform.position.x;
float minXValue = healthTransform.position.x - healthTransform.rect.width;

private void HandleHealth()
{
    Stats attachedStats = attachedObject.GetComponent<Stats>();

    float currentXValuePlayer = MapValues(attachedStats.currentHealth, 0, attachedStats.maxHealth, minXValue, maxXValue);
    healthTransform.position = new Vector3(currentXValuePlayer, cachedY);
}

private float MapValues(float x, float inMin, float inMax, float outMin, float outMax)
{
    return (x - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
}
/*
EXPLANATION:
attachedStats.currentHealth is the current health the player has
attachedStats.maxHealth is the maximum amount of health the player can have
minXValue is the furthest left point the bar is at when health is 0
maxXValue is the furthest right point the bar is at when health is full
*/

This is the setting I use for the canvas the healthbar is drawn on.

The trouble is(probably) that because of the scaling the canvas does, healthTransform.rect.width still returns the original size of the healthbar and not the new, scaled size. So is there a way to find out how much the Canvas Scaler has scaled things?

Answer 1

I asked the same question back in December on the Unity forums:

http://forum.unity3d.com/threads/canvasscaler-current-scale.285134/

The answer from Unity was: "After the canvas has been scaled you should be able to just read it back from the scaleFactor on the canvas as the canvas scaler just controls this value. "

But, no matter how small the UI gets, the value of scaleFactor is always 1.0. I don't know why this is, and Unity never responded again. Has anyone else had any luck being able to extract this value?

As a workaround, The RectTransform's localScale on the object you have CanvasScaler script on should reflect the current scale of the entire UI.