Supplement: C++ Code Examples
Example 9-4. C++ Code Fragments: Rectangles Only
void Rectangle::draw () {
drawLine(_x1,_y1,_x2,_y1);
drawLine(_x2,_y1,_x2,_y2);
drawLine(_x2,_y2,_x1,_y2);
drawLine(_x1,_y2,_x1,_y1);
}
void V1Rectangle::drawLine
(double x1, double y1,
double x2, double y2) {
DP1.draw_a_line(x1,y1,x2,y2);
}
void V2Rectangle::drawLine
(double x1, double y1,
double x2, double y2) {
DP2.drawline(x1,x2,y1,y2);
}
|
Example 9-5. C++ Code Fragments: Rectangles and Circles without Bridge
class Shape { public: void draw ()=0; } class Rectangle : Shape { public: void draw(); protected: void drawLine( double x1,y1, x2,y2)=0; } void Rectangle::draw () { drawLine(_x1,_y1,_x2,_y1); drawLine(_x2,_y1,_x2,_y2); drawLine(_x2,_y2,_x1,_y2); drawLine(_x1,_y2,_x1,_y1); ... |
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