CorelDRAW tutorial, CorelDRAW software Bezier tool use skills
Speaking ofphotoshop、Fireworks、CorelDrawtheseDesignThe “Bessel” tool in the software may not be very familiar to us, nor may we understand its importance. So many friends feel that this thing is somewhat abstruse, and it is not easy to control. Maybe after you read this article, it will not be too difficult to master it.
1、 Bessel curve everywhere
When it comes to the “Bessel” tool in Photoshop, Fireworks, CorelDraw and other design software, you may not be very familiar with it or understand its importance. So many friends feel that this thing is somewhat abstruse, and it is not easy to control. Maybe after you read this article, it will not be too difficult to master it.
Because most of the time for computer drawing is to use the mouse to grasp the path of lines (a good handwriting board is expensive), it is very different from the feeling and effect of hand drawing. Even if a shrewd painter can easily draw all kinds of figures, it is not easy to get the mouse to paint at will. This point is that computers can never replace manual work, so so far people can only feel helpless. The use of Bezier tools for drawing makes up for this shortcoming to a large extent.
“Bessel curve” was discovered by Pierre Bezier, a French mathematician, which laid a foundation for computer vector graphicsBasics。 Its main significance lies in that both straight lines and curves can be described mathematically.
It’s all caused by appellation! “Bessel” tool is called “pen tool” in PhotoShop; Translate into “Bessel Tool” in CorelDraw; It is called “brush” in Fireworks. It is a professional tool for drawing lines. Of course, there are many tools that can also complete the line drawing work, such as the straight line, airbrush and brush tools in Photoshop, the straight line, pencil and brush tools in FireworksBrushTools, free pens in CorelDraw, hand painting tools, etc.
It is very easy to draw straight lines or curves with the “Bezier” tool. Its operation feature is to place each anchor point on the panel with the mouse, and produce a straight line or curve effect according to the path of the anchor point and the order of drawing. We all know that a path consists of one or more straight or curved segments. The anchor marks the end of the path segment. On the curve segment, one or two direction lines are displayed for each selected anchor point, and the direction line ends at the direction point. The position of the direction line and direction point determines the size and shape of the curve segment. Moving these elements will change the shape of the curve in the path, as shown in the following figure. The path can be closed, without a start point or end point (such as a circle), or it can be open, with obvious end points (such as wavy lines).
Bessel “Pierre Bezier”. He was an engineer of Renault Automobile Company in France. He invented the Bezier curve for the purpose of designing the car shape. He died at the end of 1999, not long ago.
1. Draw line segments
Bessel tool is one of the most important tools in all drawing software. The Bezier Tool can create lines and symmetrical smooth curves that are more accurate than hand drawn tools. For most users, the Bezier tool provides the best drawing control and the highest drawing accuracy.
In order to enable beginner users of graphic software to understand the application of “Bezier Tools”, we take CorelDRAW software as an example to analyze the use of “Bezier Tools” in detail.
“Bessel” is the title in CorelDRAW. In PhotoshopIllustrator, InDesign, QuarkXPress and other software. Although the names are different, their functions are the same. You can understand them by analogy.
1. Draw line segments
The “Bezier Tool” can be used to draw line segments in the same way as the “Hand Drawing Tool”. Holding down the Ctrl key restricts the drawing of segments horizontally, vertically or at an angle. The difference is that the Bezier Tool can draw multiple segments continuously. Take Figure 3 as an example: first click the mouse at a certain position on the screen to specify the starting point, then move the mouse to (needlessly press and hold) Red Circle 1 and click to specify the ending point of the first line segment (when drawing a polyline, this ending point is also the starting point of the next line segment), then continue to move the mouse to Jingquan 2 and click to complete the drawing of the second line segment; By analogy, the mouse will continuously click in the new position to generate new line segments.
Figure 3
If drawing a closed object, the drawing process of “Bezier Tool” is as shown in Figure 4: click the mouse at red circle 1 to specify the starting point, and then move the mouse to click at red circle 2 to draw a line segment; Keep the tool unchanged, continue to move the mouse to Red Circle 3, Red Circle 4, Red Circle 5 and click, and finally move to Red Circle 1. Click the mouse at the starting point to complete the closing operation, and a polygon is completed.
Figure 4
2. Understanding Bezier Curve
“Bezier curve” is a straight line or curve composed of line segments connected by nodes. Each node has control points, allowing the shape of the line to be modified.
Bezier curve is composed of one or more line segments or curve segments, as shown in Figure 5. The endpoint of the path segment is marked with nodes. On the curve segment, each selected node displays one or two direction lines, which end at the direction point. The position of the direction line and direction point determines the size and shape of the curve segment. Moving these factors will change the shape of the curve.
Figure 5
Bezier curves include symmetrical curves and cusp curves: symmetrical curves are connected by nodes called symmetrical points, and cusp curves are connected by corners, as shown in Figure 6.
Figure 6
When moving the direction line on the symmetrical point, the curve segments on both sides of the symmetrical node will be adjusted at the same time; In contrast, when moving the direction line on the corner, only the curve segments on the same side as the direction line are adjusted, as shown in Figure 7.
Figure 7
The Bezier curve can be closed, without a start point or end point (such as a circle), or it can be open, with an obvious end point (such as a wavy line).
Use “Bezier Tool” and “Shape Tool” to create graphic objects of any complexity, as shown in Figure 8.
Figure 8
