Design Patterns Explained

158 Part III Design Patterns
Example 9-5 C++ Code Fragments:
Rectangles and Circles without Bridge (continued)
// V1Rectangle and V2Rectangle both derive from
// Rectangle header files not shown
void V1Rectangle::drawLine (
double x1,y1, x2,y2) {
DP1.draw_a_line(x1,y1,x2,y2);
}
void V2Rectangle::drawLine (
double x1,y1, x2,y2) {
DP2.drawline(x1,x2,y1,y2);
}
}
class Circle : Shape {
public:
void draw() ;
protected:
void drawCircle(
double x, y, z) ;
}
void Circle::draw () {
drawCircle();
}
// V1Circle and V2Circle both derive from Circle
// header files not shown
void V1Circle::drawCircle (
DP1.draw_a_circle(x, y, r);
}
void V2Circle::drawCircle (
DP2.drawcircle(x, y, r);
}