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figure 7 - Definition of a
tangent
Figure 9 - Symmetrical
Definition
Editing Objects Part I
How curves work
Editing curves works on the basis of a method called Bezier curves
3
. The complete study of
such curves goes beyond this particular work. We shall cover the basics of this quite
powerful method of editing the contour of an object.
Editing a point in a Bezier curve uses several mechanisms as
represented in the drawing on the left: The main point is
called the junction point. Two tangents project from this
point, enabling manipulation of the curve that passes through
the junction point. The basic idea is that, around the junction
point, the two sides of the curve 'flatten' out more or less
along the tangent depending upon the size and position of the
tangent.
You can create all manner of shapes by moving either the junction point itself, or one or both
of the round handle points at either end of the tangent.
The Bezier Curve Toolbar
When you work in edit point mode, the object bar changes as shown in Figure 8.
On this toolbar, some buttons can be pressed or not. Their behavior is then different. The role
of the three buttons enabling you to choose the type of tangent will be described in the
following chapter. They are the sixth, seventh, and eighth buttons in the toolbar. The
functioning of the other remaining buttons will be described in relation to working examples.
The three kinds of tangent
Three buttons in the toolbar let you select the type of tangent and convert from one type to
another. Only one of these buttons can be depressed at any given time.
The button lets you work with a symmetrical tangent. Any
movement of one or the other of the handles will be carried
over symmetrically to the other one.
3 Bezier curves were invented by Pierre Bézier, an engineer working with the Renault car manufacturer, who
developed the technique in the 1960s. The technology was intended to make modeling the surface of vehicles
easier.
Draw Guide 30
Figure 8 - Edit Points Toolbar
- Draw Guide: 1
- Contents 3
- Draw Guide ii 4
- Draw Guide iii 5
- Draw Guide iv 6
- Draw Guide v 7
- Overview 8
- Introduction to Draw 9
- The Workplace 10
- The Toolbars 11
- The Object Bar 12
- The Main Toolbar 12
- The Color Bar 13
- The Option Bar 14
- The Rulers 14
- The Status Bar 15
- Drawing Basic Shapes 16
- Draw Guide 9 17
- Draw Guide 10 18
- Drawing a rectangle 19
- Drawing a circle 19
- The Basic Drawing Shapes 20
- Here is a text 21
- Rectangles and Squares 22
- Circles, Ellipses and Arcs 22
- Draw Guide 15 23
- 3D Objects 24
- Draw Guide 17 25
- Lines and Arrows 26
- Connectors 27
- Draw Guide 20 28
- Editing Gluepoints 29
- Draw Guide 22 30
- Draw Guide 23 31
- Editing Objects Part I 32
- Selecting Objects 33
- Selecting hidden objects 34
- Arranging objects 34
- Selecting several objects 34
- Dynamic movement of objects 35
- Rotating an Object 36
- Editing Object Points 37
- How curves work 38
- The Bezier Curve Toolbar 38
- The three kinds of tangent 38
- Examples 39
- Draw Guide 32 40
- Draw Guide 33 41
- Draw Guide 34 42
- Draw Guide 35 43
- Editing Objects Part II 44
- The Object Toolbar 45
- Draw Guide 38 46
- Draw Guide 39 47
- Area Fill 48
- Draw Guide 42 50
- Draw Guide 43 51
- Draw Guide 44 52
- The Text Object Edit Toolbar 53
- Size Data Entry 54
- Angle of Rotation Data Entry 54
- Inclination Data Entry 55
- Using the Stylist 56
- Applying a Style 57
- Draw Guide 50 58
- Special Transformations 59
- Draw Guide 52 60
- 3D Rotation Objects 61
- Draw Guide 54 62
- Draw Guide 55 63
- Draw Guide 56 64
- Draw Guide 57 65
- Dynamic Gradient Definition 66
- Managing 3D Objects and 67
- 3D effects 68
- Draw Guide 61 69
- Geometry Management page 70
- Draw Guide 63 71
- Draw Guide 64 72
- Shading page 73
- Draw Guide 66 74
- Illumination page 75
- Texture Management page 76
- Draw Guide 69 77
- Draw Guide 70 78
- Materials Management page 79
- Managing Bitmaps 80
- Draw Guide 73 81
- Smooths an image 82
- Sharpens an image 82
- Draw Guide 75 83
- Draw Guide 76 84
- Draw Guide 77 85
- Combining Multiple Objects 86
- Draw Guide 79 87
- Combination Functions 88
- Shape Merge Functions 89
- Subtract 90
- Intersect 91
- Draw Guide 84 92
- Aids for Object Positioning 93
- Draw Guide 86 94
- Distribution of Objects 95
- Draw Guide 88 96
- Managing Object Arrangement 97
- Draw Guide 90 98
- Draw Guide 91 99
- Additional Tools 100
- Zoom Toolbar 101
- Managing Layers 102
- Placing Objects 103
- The Magnetic Grid 104
- Capture Lines 105
- Snapping to object border 106
- Snapping to page 107
- Displaying guides 107
- Specific Functions 108
- Cross-Fading 109
- Draw Guide 102 110
- Draw Guide 103 111
- The Web export function 112
- Draw Guide 105 113
- Draw Guide 106 114
- Draw Guide 107 115
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