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h3

王朝other·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

Homework Assignment #3 - Enhanced version of SimpleDraw

SimpleDraw is a 2D graphics drawing product. In homework assignment #2, we already wrote the core engine of the graphics system

to implements the abstraction of a drawing, this time we need work out the enhanced core engine of and add more features.

A drawing is defined as a 2D space (canvas) that contains an unlimited number of drawing primitives.

Canvas has initial size, use a unified x,y coordinate system ( left corner is 0.0, 0.0 ) to define

Canvas can set backgroud color (black, white, grey, red, green, blue, yellow) and border type (thin, heavy, none)

Each drawing primitives (element) in canvas must has his center within the range of canvas.

There are 4 drawing primitives (element) defined:

1. dot

2. ellipse (width, height)

3. rectangle (width, height)

4. polygon (diameter, vertex)

Element use centre point to represent its location (x,y)

Element can be set different foreground color (black, white, grey, red, green, blue, yellow )

Element can use different kind of line type (solid, dash, dot) to display

Canvas can support zoom in/out operation, at same time, elements in drawing also support zoom in/out with the same ratio

as canvas. (zoom in/out base on its centre point)

Your software need to support draw function to out the result of drawing, but it not means you really need use DC to draw

the canvas and those elements on screen, just display the drawing in the following format:

Drawing Name: Drawing 1 <-- drawing info

Background color: White

Border type: none

Zoom level: 2.5

Total number of elements: 59

Canvas Size: 1020, 768

Element1: Ellipse <-- here begin the elements info

Location: 0, 10

Color: red

Width: 100

Heigh: 400

Element2: Rectangle

Location: 30, 78

Color: black

Width: 500

Height:800

Element3: Dot

Location: 500, 600

Color: yellow

.....

Primitive59: Polygon

Location 100, 600

Color: green

diameter: 250

vertex: 6

Note:

1) coordinate system use double value to represent

2) zoom level use double value to represent

3) vertex in polygon means the number of vertex (>=3, <=32)

4) each element has same format in displaying their information, but the content is different, some feature only available in given element

e.g. Dot without width and height, Polygon has diameter and vertex

#ifndef CANVAS_H

#define CANVAS_H

typedef double Coordinate;

typedef enum Colors{black, white, grey, red, green, blue ,yellow}Colors;

class Canvas{

public:

Canvas();

~Canvas();

private:

Coordinate x_, y_;

Colors backgroudColor_;

};

#endif //CANVAS_H

 
 
 
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