Added bordered-rectangle helper functions (without adding users)

raygui/raygui.go

@@ -45,3 +45,24 @@ func GetInteractionState(rectangles ...rl.Rectangle) ControlState {
 		return Focused
 	}
 }
+
+// InsetRectangle returns the dimensions of a rectangle inset by a margin within an outer rectangle.
+func InsetRectangle(outer rl.RectangleInt32, inset int32) rl.RectangleInt32 {
+	return rl.RectangleInt32{
+		X: outer.X + inset, Y: outer.Y + inset,
+		Width: outer.Width - 2*inset, Height: outer.Height - 2*inset,
+	}
+}
+
+// DrawInsetRectangle is a helper to draw a box inset by a margin of an outer container.
+func DrawInsetRectangle(outer rl.RectangleInt32, inset int32, color rl.Color) {
+	inside := InsetRectangle(outer, inset)
+	rl.DrawRectangle(inside.X, inside.Y, inside.Width, inside.Height, color)
+}
+
+// DrawBorderedRectangle is a helper to draw a box with a border around it.
+func DrawBorderedRectangle(bounds rl.RectangleInt32, borderWidth int32, borderColor, insideColor rl.Color) {
+	inside := InsetRectangle(bounds, borderWidth)
+	rl.DrawRectangle(bounds.X, bounds.Y, bounds.Width, bounds.Height, borderColor)
+	rl.DrawRectangle(inside.X, inside.Y, inside.Width, inside.Height, insideColor)
+}