You need to use GraphicsSystem.Configuration API to set or unset various effects on graphics system.
For example this will turn on LineSmoothing
public string[] FeatureName = {
"ACAD_Configlevel",
"ACAD_2DRetainModeLevel",
"ACAD_HQGeom",
"ACAD_PerPixelLighting",
"ACAD_AdvancedMaterial",
"ACAD_FullShadows",
"ACAD_TextureCompression",
"ACAD_LineSmoothing",
"ACAD_LineFading",
"ACAD_GlowHighlighting",
"ACAD_2DRetainMode",
"ACAD_GPULineType",
"ACAD_GPUHatch"
};
[CommandMethod("GSTEST")]
public void GsConfigTest()
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
using (Autodesk.AutoCAD.GraphicsSystem.Configuration config = new Autodesk.AutoCAD.GraphicsSystem.Configuration())
{
if (!config.IsHardwareAccelerationAvailable())
{
Application.ShowAlertDialog("Check your Video Card");
return;
}
//if we Hardware is available, check if it is enabled else turn on.
if (!config.IsHardwareAccelerationEnabled())
{
config.setHardwareAcceleration(true);
}
foreach (EffectStatus effStatus in config.GetEffectList(EffectListType.kEL_Current))
{
var effectName = effStatus.EffectName;
var unqString = effStatus.EffectUniqueString;
int featureLevel = effStatus.FeatureLevel;
var isEnabled = effStatus.Enabled;
ed.WriteMessage($"\n{effectName}\t{featureLevel}\t{isEnabled}");
}
//Turn on LineSmoothing
UniqueString featureString = UniqueString.Intern("ACAD_LineSmoothing");
if (config.IsFeatureAvailable(featureString))
{
if (!config.IsFeatureEnabled(featureString))
config.SetFeatureEnabled(featureString, true);
}
}
}