Well you did not provide your source code you are using so I cannot provide a precise solution. Next time, please be sure to include your code, working or not, so I can teach you more. For now, all I can do is provide a single statement that compares the closing price of two candles and computes the percent change between them:
def percentChange = 100 * (close / close[1] -1);
It's just basic math. In English that is "100 times the result of current close divided by previous close minus 1".
The math formula inside the parentheses computes the raw decimal value. We multiply that by 100 to move the decimal place two places to the right so we can express that as an actual percent value. So if the raw percent change from one close to the next is 0.10 then this formula returns a value of 10.0%.
100 * (90 / 100 - 1) = -10%
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