Abstract: A computer aided design system comprises an interface creating module, a first calculating module, a dividing module and a second calculating module. The interface module creates a parameter setting interface to display the proposed design on the screen of the device formed with nets and cline segments and select at least one net in response to the user's operation. The first calculating module calculates the length of the cline segments of the potential net in order based on the coordinates of the cline segments and generates a dividing signal. The dividing module divides the cline segments into a first team and a second team based on the compared result with a predetermined width according to the dividing signal. The second calculating module adds the calculated cline segments length in the first team and in the second team to obtain a first length and a second length.

Abstract: A computer aided design system comprises a storage module, an interface creating module, and a calculating module. The storage module stores a contact list, one or more programs, and coordinates of each net which is being composed of a plurality of cline segments. The interface module creates a parameter setting interface on the screen of the device to display a design with a plurality of to-be-calculated nets and select at least one net in response to the user's operation. The calculating module calculates the length of each branch of the selected nets.

Abstract: A computer aided design system comprises an interface creating module, a reference layer setting module, a detecting module and a signing module. The interface module creates a parameter setting interface to select at least one net being composed of a plurality of cline segments, and set a stack distance. The reference layer setting module sets a reference layer for the layer contained the selected net based on the stack distance. The detecting module obtains a projection of the cline segment of the selected net on the reference layer, sets a region corresponding to the cline segment on the reference layer, detects whether the projection extends out of the set region, and generates a signing signal to sign the cline segment when the projection does extend out of the set region. The signing module signs the cline segment according to the sign signal.

Abstract: A computer aided design system comprises an interface creating module, a first calculating module, a dividing module and a second calculating module. The interface module creates a parameter setting interface to display the proposed design on the screen of the device formed with nets and cline segments and select at least one net in response to the user's operation. The first calculating module calculates the length of the cline segments of the potential net in order based on the coordinates of the cline segments and generates a dividing signal. The dividing module divides the cline segments into a first team and a second team based on the compared result with a predetermined width according to the dividing signal. The second calculating module adds the calculated cline segments length in the first team and in the second team to obtain a first length and a second length.