使用UWidgetBlueprintLibrary類的繪制函數，可以在UMG里繪制二維圖像。

做成靜態函數后就可以在藍圖中直接調用

void AAGraphics::DrawLine(FPaintContext Context, FVector2D PositionA, FVector2D PositionB, FLinearColor Tint, bool bAntiAlias) {UWidgetBlueprintLibrary::DrawLine(Context, PositionA, PositionB, Tint, bAntiAlias); }void AAGraphics::DrawTriangle(FPaintContext Context, FVector2D PositionA, FVector2D PositionB, FVector2D PositionC, FLinearColor Tint, bool bAntiAlias) {UWidgetBlueprintLibrary::DrawLine(Context, PositionA, PositionB, Tint, bAntiAlias);UWidgetBlueprintLibrary::DrawLine(Context, PositionB, PositionC, Tint, bAntiAlias);UWidgetBlueprintLibrary::DrawLine(Context, PositionC, PositionA, Tint, bAntiAlias); }void AAGraphics::DrawFullCircle(FPaintContext Context, FVector2D Center, float radius, int NumSegments, FLinearColor Tint, bool bAntiAlias) {if (NumSegments == 0)NumSegments = 360.0;float SegmentLength = 360.0 / NumSegments;for (float i = 0; i < 360; i += SegmentLength){FVector2D PositionA(cos(i * PI / 180.0) * radius + Center.X, sin(i * PI / 180.0) * radius + Center.Y);FVector2D PositionB(cos((i + SegmentLength) * PI / 180.0) * radius + Center.X, sin((i + SegmentLength) * PI / 180.0) * radius + Center.Y);FVector2D PositionC(Center.X, Center.Y);DrawTriangle(Context, PositionA, PositionB, PositionC, Tint, bAntiAlias);} }void AAGraphics::DrawCircle(FPaintContext Context, FVector2D Center, float radius, int NumSegments, FLinearColor Tint, bool bAntiAlias) {if (NumSegments == 0)NumSegments = 360.0;float SegmentLength = 360.0 / NumSegments;for (float i = 0; i < 360.0; i += SegmentLength){FVector2D PositionA(cos(i * PI / 180.0) * radius + Center.X, sin(i * PI / 180.0) * radius + Center.Y);FVector2D PositionB(cos((i + SegmentLength) * PI / 180.0) * radius + Center.X, sin((i + SegmentLength) * PI / 180.0) * radius + Center.Y);UWidgetBlueprintLibrary::DrawLine(Context, PositionA, PositionB, Tint, bAntiAlias);} }

總結

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