Canvas Plugin Health Bar?

does anybody know how to draw a resizeable health bar with R0J0hound's canvas plugin?

I know I can make one 100 pixels wide

doing something like this

Draw Box

X 164

Y 94

W (health/maxhealth)*100

H 6

but how do I draw one 328 pixels wide with the health bar being based off of 100%?

(health/maxhealth)*328 ?

well I have tried (health/100)*healthbar.width when i was using a sprite but that didn't work

maybe because my healthbar.width was changing?

You shouldn't multiply with healthbar.width, but with the maximum width of the healthbar..