Comprehensive profile curve offset method
A contour curve and comprehensive technology, applied in the field of 3D modeling of computer graphics, can solve the problems of complex stability of curve offset algorithm, narrow application range of offset algorithm, few researches on non-equidistant offset, etc., and achieve the goal of expanding The scope of application, the effect of improving usability and simple process
Pending Publication Date: 2020-06-05
HANGZHOU QUNHE INFORMATION TECHNOLOGIES CO LTD
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Problems solved by technology
[0007] It can be seen that the biasing algorithm based on the principle of straight skeleton has a narrow application range, the curve biasing algorithm based on segmental intersection is complex and has poor stability, and there are few studies on non-equidistant biasing
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[0037] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the invention, and detailed implementation methods and specific implementation processes are provided, but the protection scope of the present invention is not limited to The implementation example is as follows.
[0038] A comprehensive contour curve offset method proposed by the present invention is suitable for contour curves composed of plane straight line segments and circular arc segments, and the equidistant offset and non-equidistant offset are processed in two cases, specifically Proceed as follows:
[0039] 1) Equidistant offset processing: In practical engineering applications, it is common to perform equidistant offset operations on closed contour curves. The key point is the calculation of the curved skeleton. The skeleton is a shape feature that is defined by a ...
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The invention discloses a comprehensive contour curve offset method. A contour curve is processed according to equidistant bias and non-equidistant bias, a 'curved skeleton' is derived on the basis ofa straight skeleton principle and used for simply and efficiently calculating the equidistant bias result of the contour curve, and the equidistant bias condition is processed through the steps of calculating a bisectrix, forming the curved skeleton, solving the bias result and the like. In addition, a new thought of a piecewise intersection offset solving algorithm is innovatively provided, so that the algorithm can be applied to solving of a non-equidistant offset problem; the non-equidistant bias condition is processed through the steps of local bias, extension intersection, cutting and splicing, self-intersection processing and the like. The method has the beneficial effects that the method can be applied to house type tools and whole house customization tools of a certain large online home decoration design platform in China, and the usability, the use efficiency and the like of the tools are greatly improved through efficient and stable bias results.
Description
technical field [0001] The invention belongs to the technical field of 3D modeling of computer graphics, and mainly relates to a comprehensive contour curve offset method. Background technique [0002] In computational geometry, the curve formed by moving a fixed distance along the normal direction of a point on a known plane curve is called an offset curve. In actual engineering, multiple curve segments in the plane profile are often offset and connected to form a new profile. The new profile and the original profile have similar characteristics, and this process is called the offset operation of the profile curve. Due to the similarities and differences of the curve offset distance, it can be divided into equidistant offset and non-equidistant offset. In equidistant offset, the distances from the points on the new contour to the original contour are equal. With a non-equidistant offset, the distance from each edge of the new contour to the original edge may be different ...
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Login to View More IPC IPC(8): G06T11/20G06T7/62
CPCG06T11/203G06T7/62
Inventor 陈俊李修安张凯
Owner HANGZHOU QUNHE INFORMATION TECHNOLOGIES CO LTD