(1) Design an easy-to-understand interface, and you can enter the graphic information that needs to be drawn through the mouse, menu, dialog box, etc.
(2) The length, area, perimeter and other properties of the drawing can be calculated, and have been displayed in or next to the drawing in dialog boxes, panels or directly through text.
(3) Able to deal with two-dimensional graphics such as line segments, multi-segmented polyline segments, triangles, rectangles, ordinary N-sides, circles, ellipses, etc.
(4) Design an abstract base class Shape that is common to all graphics, and all other graphics classes inherit from the abstract base class or its linear abstract subclass LineShape or regional graphic abstraction subclass
requirements
AreaShape
(5) Each specific graph (line segment, triangle, etc.) has static variables to count the total number of the graph in the system.
(6) Each type of graph has a name, color, and line type data member; And there are functions such as the move function Move/MoveTo, the calculated length Length, etc., wherein the calculated length of the regional graph is the calculated perimeter; A line graph has a function to calculate vertex data and a member function to calculate the number of vertices, and a regional graph has a member function to calculate the area.
(7) Other extra functions: a) Modify line type, color, etc. b) Drag and drop the mouse to move and modify the shape. c) Save the drawing to a file and load the drawing. d) Rotation of the figure.

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Q&A

What is the delivery method?

1, automatic: after taking the photo, click the (download) link to download; 2. Manual: After taking the photo, contact the seller to issue it or contact the official to find the developer to ship.

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How long is the trading cycle?

1, the default transaction cycle of the source code: manual delivery of goods for 1-3 days, and the user payment amount will enter the platform guarantee until the completion of the transaction or 3-7 days can be issued, in case of disputes indefinitely extend the collection amount until the dispute is resolved or refunded!

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Matters needing attention

1. Heptalon will permanently archive the process of trading between the two parties and the snapshots of the traded goods to ensure that the transaction is true, effective and safe! 2, Seven PAWS can not guarantee such as "permanent package update", "permanent technical support" and other similar transactions after the merchant commitment, please identify the buyer; 3, in the source code at the same time there is a website demonstration and picture demonstration, and the site is inconsistent with the diagram, the default according to the diagram as the dispute evaluation basis (except for special statements or agreement); 4, in the absence of "no legitimate basis for refund", the commodity written "once sold, no support for refund" and other similar statements, shall be deemed invalid; 5, before the shooting, the transaction content agreed by the two parties on QQ can also be the basis for dispute judgment (agreement and description of the conflict, the agreement shall prevail); 6, because the chat record can be used as the basis for dispute judgment, so when the two sides contact, only communicate with the other party on the QQ and mobile phone number left on the systemhere, in case the other party does not recognize self-commitment. 7, although the probability of disputes is very small, but be sure to retain such important information as chat records, mobile phone messages, etc., in case of disputes, it is convenient for seven PAWS to intervene in rapid processing.

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Systemhere declaration

1. As a third-party intermediary platform, Qichou protects the security of the transaction and the rights and interests of both buyers and sellers according to the transaction contract (commodity description, content agreed before the transaction); 2, non-platform online trading projects, any consequences have nothing to do with mutual site; No matter the seller for any reason to require offline transactions, please contact the management report.

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