3.Images of the Bezier curve's control handles.
Because it isn't possible to understand difficultly even if it hears the way of calculation of the control handle of the Bezier curve, let's attempt to think of the control handle by the image.
When stretching a control handle by the Bezier curve, Adobe Illustrator computes a smooth curve to the origin in the direction and the length.Because it isn't possible to understand difficultly for the person even if it hears the way of calculation, let's attempt to think by the image that it is possible to use a control handle easily.
To understand to stretch a control handle to which direction when drawing a path by the illustrator, it draws in which degree it should stretch many times and it is the 1st that is accustomed.However, it anyhow thinks that to draw while imagining the duty of the control handle if practicing is earlier about being brought along, too.
Therefore, it prepared a simple illustration.
The segment joins an anchor points and an anchor points.It leaves some anchor points and it aims at the following anchor points.
1.A segment leaves an anchor points and it is made to aim at the following anchor points by it but when the control handle comes out, almost, it is pulled to the control handle.
2.Because the power which is gradually pulled while advanced becomes weak, it corrects an orbit little by little.
3 to 4.While correcting an orbit, the segment during orbit correction approaches from that place, too.Then, it is the meaning that the segment is complete in the safely meeting spot.
When the length of the control handle changes here, the timing with pulled weakening power changes.
1 to 2.When the control handle is long, it is steadily pulled to the control handle.
( Of course, because there is not even a druse to make by 100 %, it is subtle resemblance but it is heading for the following anchor points, too ).
3 to 4.Because the pulled power, too, becomes weak when advanced, to be certain degree of, it begins the correction of the orbit rapidly when it let's retrieve delay so far.
Therefore, because the place to bend suddenly appears too much in the control handle when long, the way of bending in the segment, too, isn't smooth.
1 to 2.Because it heads for the following anchor points at once when the control handle is short oppositely, it approaches a straight line gradually.Because the control handle has become a corner too much in the both edges of the anchor points when short, the way of bending in the segment isn't smooth as expected.
When two control handles go out of the anchor points, the segment and the segment lead smoothly when the two control handles lead and become 180 degrees.
When a control handle is divided, the path is an anchor points and becomes a breaking corner.
Segment simple substance is computed to become smooth as much as possible but when wanting to make smooth as the whole path, when not careful of the division of the control handle not to intend, it has broken easily.
To link the control handle which broke in Adobe Illustrator, it is necessary to draw once more by the change tool of the anchor points ( the 8th lecture ).
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