一種矢量圖形工具的設計與實現

論文字數:12121,頁數:29

摘  要
矢量圖形系統的開發是利用VC++開發地理信息系統(GIS系統)的重點和難點。利用VC++進行矢量圖形系統的開發主要是利用VC++的設備環境DC提供的功能進行圖形繪制和采用面向對象的方法來組織和管理矢量圖形數據。
該論文分析了矢量圖形系統的基本結構，采用了面向對象的思想，設計了圖形對象的類繼承層次，其中基類對象又派生出直線、圓弧(圓)和曲線，文本等類,給出了矢量圖形系統類的組織結構。并且從整體功能結構到單獨的類的具體實現和視圖的實現，鼠標交互繪制，圖形操作，圖形選中、移動、刪除等各個方面開發實現了一個基本的矢量圖形工具系統。完成了處理點、線、圓、面、標注文本等圖形元素的功能，并具有處理圖例(即圖形塊)的能力；具有相對完善的圖形操作功能，方便的圖形I/O功能，以及圖形移動、刪除的功能。

關鍵詞：面向對象；圖形操作；I/O；
The Design and Realization of a Vector Graphics Tool
Abstract
The Vector Graphics system is one of the most important and difficult parts for GIS(Geographical Information System) development with VC++. The Vector Graphics system mainly includes implementing different drawing functions under the environment provided by VC + + 6.0， organizing and managing vector-based graphic data by means of object-based methods.
The idea of object-oriented is introduced in this paper, the geographic elements in the system are classified into line, arc(circle) ,curve and text. The basic classes’ framework is proposed by analyzing the basic structure of the vector graphics system. A basic vector graphics tool system is designed and realized from the kind of organization, the view’s realization, the mouse’s alternately draws up, the graphics operation, the graph selected, migration, deletion, and so on. Different drawing functions are implemented, including spot, line, circle, surface and note text. The system has the ability of processing chart of symbols (namely graph block). The realizations of relative consummation graphics operation function and facilitates graph I/O function is given, as well as graph migration, deletion function.

Key  words : Object-oriented; Graph operation; I/O;

目  錄

1 引言 1
1.1 課題背景及研究的目的和意義 1
1.2 矢量圖形系統 1
1.3 課題研究方法 1
2 總體設計思想 2
2.1 整體功能模塊的設計 2
2.2 功能模塊說明 2
3 矢量圖形結構 3
3.1 基類的組織 3
3.2 視圖的實現 5
3.2.1 實際坐標與邏輯坐標的轉換 5
3.2.2 圖形元素的繪制功能 6
3.3 圖形操作方面 6
3.3.1 屏幕狀態的記錄 6
3.3.2 邊界矩形 7
3.3.3 點選的判斷和特殊顯示 7
3.3.4 圖形的移動 9
3.4 提高圖形重畫速度 9
4 矢量圖形工具系統的設計 10
4.1 類的實現 10
4.2 鼠標交互繪制 13
4.3 重畫技術 13
4.3.1 圖形重畫 13
4.3.2 重畫上屏、首屏和顯示全圖 15
4.4 圖形移動和選中后操作 17
4.4.1 圖形點選功能 17
4.4.2 圖形移動 20
5 系統測試 21
結    論 22
參考文獻 23
致    謝 24
聲    明 25