January 2016
Beginner
512 pages
12h 35m
English
Content preview from Game Programming Using Qt Beginner's GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Time for action – making the diagram more colorful
The diagram serves its purpose, but it looks a bit dull. Add some shine to it by defining three new color properties in the canvas object–color, topColor, bottomColor–and setting their default values to black, red, and blue, respectively.
Since points and arg should not really be public properties that anyone can change behind our backs, we'll correct it now. Declare a child element of the canvas of QtObject and set its ID to priv. Move declarations of points and arg inside that object. Move the onArgChanged handler there, as well:
QtObject { id: priv property var points: [] property real arg: -Math.PI onArgChanged: { points.push(func(arg)) points = points.slice(-canvas.width) canvas.requestPaint() ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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