[CHUKWA-69] Calculate trapezoid area for a given series of data

• Type: Task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Component/s: User Interface
• Assignee: Cheng
• Reporter: Cheng
• Created: 31/Mar/09 20:16
• Updated: 03/Apr/09 23:30
• Resolved: 31/Mar/09 21:11

Description

Calculate trapezoid area for a given series of data.

suppose we have:

x0, x1, x2, x3
y0, y1, y2, y3

the area would be

(x1-x0) * (y1+y0)/2 + (x2-x1) * (y2+y1)/2 + (x3-x2) * (y3+y2)/2