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Kéo điểm điều khiển từ các kiến trúc. Nếu Alt (Option) không ép, đường kết nối (phía bên trái của vòm) sẽ bị ảnh hưởng kéo controlpoint. 5. Thả nút chuột khi vòm là trong hình dạng mong lý kiểm soát chặt chẽ hơn là đường cong điểm liên quan của nó, phẳng hơn đường cong. ✦ Ngoài ra, | Chapter 5 Creating Vector Objects 165 4. Drag the control point away from the arch. If Alt Option was not pressed the connecting line on the left side of the arch would be affected by the controlpoint drag. 5. Release the mouse button when the arch is in the desired shape. Figure 5-18 Use the Pen to manipulate Bézier curves and create objects with combinations of straight and curved lines. You can also use this constraining property to draw uneven curves where you drag a little bit before pressing Alt Option and effectively lock the previous curve. Adjusting curves The alternative name for the two control points in Bézier curves is control handles. As the name implies you can grab and manipulate control handles. By changing the position of the control handle you can adjust the shape of the curve. Here are a few guidelines for moving control handles The closer the control handle is to its associated curve point the flatter the curve. Alternatively the further away the control handle is from its curve point the steeper the curve. If a control handle is on top of its curve point the curve becomes a straight line and the curve point becomes a corner point. You can convert straight lines into curves by pulling the control handle away from the corner point. After you ve drawn a curve point you can retract one of the control handles so that the next segment can be either a curve or a straight line. 166 Part II Mastering the Tools All the manipulations involving control handles can be accomplished after the fact using the Subselection tool you can find a discussion of how to use this point adjustment device in Chapter 9. However you can perform a few of these operations while drawing with the Pen. The two key operations involve adding and removing a control handle. Adding a control handle to a corner point To add a control handle to a corner point follow these steps 1. Use the Pen to draw a path with a curve point. Two control points are visible. 2. Move the pointer over .

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