Tip: For information about which SmartArt graphic to use, and how to get started using SmartArt, see Learn more about SmartArt graphics. You can both add and delete shapes in most SmartArt graphics, and you can also change the positions of the various shapes, so you should choose a layout that provides the best visual representation of your data.

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Choose the Rounded Rectangle tool to draw rectangles or squares with rounded corners. Simply click and drag inside your Canvas to create a new shape.

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve 's award winning catalog and many Humble Bundle games.
Select the object you want to nest inside a text box or shape, then press Command-X to cut it. If the object is on the page, click to select it; if it’s inline with text, double-click to select it. Double-click the text box or shape where you want to paste the object so the insertion point appears inside it, then press Command-V to paste the object.
For 2D, I recommend HGE, a game Engine use DX as graphic driver, which is easy to start with. It can only run under Windows, but here is a port for MAC/UNIX. The problem you'll face when using SDL is that it is not hardware-accelerated. Yes, it support OpenGL, But if you want to use it with opengl, you must do every thing youself.

Vary the roundness of the corners using the Corner Radius setting in the Tool Options bar. Use the rounded square icon next to the Corner Radius input box to disable or enable the roundness for a certain corner.

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As with the Rectangle tool, holding the Shift ⇧ key while dragging will allow you to create squares with rounded corners.

Tip: Use the Shift - M keyboard shortcut to quickly select the Rounded Rectangle tool.

Next: Ellipses >

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The Shape Library panel manages libraries of reusable shapes. You can create your own libraries, save shapes, and reuse them throughout multiple projects.

Graphic includes a few built-in example libraries to help you get started. The included shapes can be used to add symbols or annotations to an existing design, create floor plan layouts, and even design iPhone app mockups.

Using Shapes

Saved shapes can be organized into libraries of related objects. To switch between libraries, simply select one from the list.

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To add a shape to a design drag it from the list onto the canvas or tap it.

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Next: Managing Shape Libraries >

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