LinearGradient Center problem

[jondoe]

Hello,
I have rectangle 862x65.
And i have 3 color red-yellow-green

I using this colors witch lineargradient in rectangle and i want show in center of rectangle.
But yellow not in center.

How can i show yellow color in center?

Codes
https://pastebin.com/ZdMvRhin

What i want?
http://prntscr.com/opj10j

Example
http://prntscr.com/opj30p

[jondoe]

Fixed problems.

Fix
start: Qt.point(0,parent.height/2)
end: Qt.point(parent.width,parent.height/2)