SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, and iOS Chart & Android Chart Components
To get higher quality lines you need to use the High Quality, or DirectX or Vector Renderer plugins in SciChart.
You can find an overview of the four plugins here: WPF Chart Use High Quality Rendering
Greater detail is found in the article High Quality vs. High Speed vs. DirectX Renderer Plugins.
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