Fixed An issue with Microsoft.Maui.Animations when testing a custom busy indicator control.

[NirmalKumarYuvaraj]

Issue Details

The custom busy indicator control disappears after some time (approx 16 seconds) on iOS and macOS.

Root Cause

Invalid valid value for start and end angle was passed to the PlatformDrawArc method. As a result, the indicator disappears from view and below message is displayed in the debug console.

Error Message

Maui.Controls.Sample.Sandbox[49285:546706] [Unknown process name] CGPathAddArc: invalid value for start or end angle.

Description of Change

• Core Graphics requires angles within the range [0,2π] radians. Any angle outside this range, whether negative or exceeding is considered invalid.

Debugging session
2024-11-18 16:24:18.799770+0530 Maui.Controls.Sample.Sandbox[49285:546706] startAngle: -359685 endAngle: -359725 2024-11-18 16:24:18.800034+0530 Maui.Controls.Sample.Sandbox[49285:546706] Drawing arc from 6282.732 to 6283.4297 2024-11-18 16:24:18.800189+0530 Maui.Controls.Sample.Sandbox[49285:546706] [Unknown process name] CGPathAddArc: invalid value for start or end angle.

• The values 6282.732 and 6283.4297 (radians) far exceed the proper radians (approximately 6.2832). These values are derived from a significantly negative start and end angle in degrees (-359685° and -359725°), converted to radians.

• Bringing them into the 0 to 2π range before using them in your drawing logic resolves the issue.

Validated the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Issues Fixed

Fixes #22055

Output

Before	After
Before.IOS.mov	After.IOS.mov
Before.MAC.mov	After.Mac.mov

[dotnet-policy-service]

Hey there @NirmalKumarYuvaraj! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jsuarezruiz]

/azp run

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