Avoid passing NaN to CoreGraphics API (Fixes #1626)
Avoid passing NaN to CoreGraphics API (Fixes #1626)

danielgindi/Charts,danielgindi/ios-charts,danielgindi/ios-charts,danielgindi/Charts,liuxuan30/Charts,liuxuan30/ios-charts,liuxuan30/Charts,liuxuan30/ios-charts,MAARK/Charts,liuxuan30/ios-charts,danielgindi/ios-charts,jjatie/Charts,danielgindi/ios-charts,liuxuan30/Charts,danielgindi/Charts,jjatie/Charts,jjatie/Charts,danielgindi/Charts,jjatie/Charts,liuxuan30/Charts,MAARK/Charts,MAARK/Charts,liuxuan30/ios-charts,MAARK/Charts