Objective-c   面向对象画图形(此程序不符合内存管理规则)

在同一个文件中，没有分割出来

#import <Foundation/Foundation.h>

// --------------------------------------------------
// constants for the different kinds of shapes and their colors

typedef enum {
    kRedColor,
    kGreenColor,
    kBlueColor
} ShapeColor;


// --------------------------------------------------
// Shape bounding rectangle

//声明结构用于形状边界
//为什么用结构来定义边界，因为结构可以方便的使用
//例：ShapeRect rect_0 = {0, 0, 1, 1};
typedef struct {
    int x, y, width, height;
} ShapeRect;


// --------------------------------------------------
// convert from the ShapeColor enum value to a human-readable name
NSString *colorName (ShapeColor color);
NSString *colorName (ShapeColor color)
{
    switch (color) {
        case kRedColor:
            return @"red";
            break;
        case kGreenColor:
            return @"green";
            break;
        case kBlueColor:
            return @"blue";
            break;
    }
    
    return @"no clue";
    
} // colorName


// --------------------------------------------------
// All about Circles

@interface Circle : NSObject
{
    ShapeColor  fillColor;
    ShapeRect   bounds;
}

- (void) setFillColor: (ShapeColor) fillColor;

- (void) setBounds: (ShapeRect) bounds;

- (void) draw;

@end // Circle


@implementation Circle

- (void) setFillColor: (ShapeColor) c
{
    fillColor = c;
} // setFillColor


- (void) setBounds: (ShapeRect) b
{
    bounds = b;
} // setBounds


- (void) draw
{
    NSLog (@"drawing a circle at (%d %d %d %d) in %@",
           bounds.x, bounds.y, 
           bounds.width, bounds.height,
           colorName(fillColor));
} // draw

@end // Circle




// --------------------------------------------------
// All about Rectangles

@interface Rectangle : NSObject
{
    ShapeColor  fillColor;
    ShapeRect   bounds;
}

- (void) setFillColor: (ShapeColor) fillColor;

- (void) setBounds: (ShapeRect) bounds;

- (void) draw;

@end // Rectangle


@implementation Rectangle

- (void) setFillColor: (ShapeColor) c
{
    fillColor = c;
} // setFillColor


- (void) setBounds: (ShapeRect) b
{
    bounds = b;
} // setBounds


- (void) draw
{
    NSLog (@"drawing a rectangle at (%d %d %d %d) in %@",
           bounds.x, bounds.y, 
           bounds.width, bounds.height,
           colorName(fillColor));
} // draw

@end // Rectangle


// --------------------------------------------------
// All about OblateSphereoids

@interface OblateSphereoid : NSObject
{
    ShapeColor  fillColor;
    ShapeRect   bounds;
}

- (void) setFillColor: (ShapeColor) fillColor;

- (void) setBounds: (ShapeRect) bounds;

- (void) draw;

@end // OblateSphereoid


@implementation OblateSphereoid

- (void) setFillColor: (ShapeColor) c
{
    fillColor = c;
} // setFillColor


- (void) setBounds: (ShapeRect) b
{
    bounds = b;
} // setBounds


- (void) draw
{
    NSLog (@"drawing an egg at (%d %d %d %d) in %@",
           bounds.x, bounds.y, 
           bounds.width, bounds.height,
           colorName(fillColor));
} // draw

@end // OblateSphereoid



// --------------------------------------------------
// Draw the shapes
void drawShapes (id shape, int count);
void drawShapes (id shape, int count) // 注意，这里和书上不同，上上为 id shapes[]，但在xcode4.2中编译错误，抛Must explicitly describe intended ownership of an object array parameter
{
        [shape draw];
    
} // drawShapes



// --------------------------------------------------
// The main function.  Make the shapes and draw them

int main (int argc, const char * argv[]) 
{
    id shapes[3];
    
    ShapeRect rect0 = { 0, 0, 10, 30 };
    shapes[0] = [Circle new];
    [shapes[0] setBounds: rect0];
    [shapes[0] setFillColor: kRedColor];
    drawShapes (shapes[0], 3);
    
    ShapeRect rect1 = { 30, 40, 50, 60 };
    shapes[1] = [Rectangle new];
    [shapes[1] setBounds: rect1];
    [shapes[1] setFillColor: kGreenColor];
    drawShapes (shapes[1], 3);
    
    ShapeRect rect2 = { 15, 19, 37, 29 };
    shapes[2] = [OblateSphereoid new];
    [shapes[2] setBounds: rect2];
    [shapes[2] setFillColor: kBlueColor];
    drawShapes (shapes[2], 3);
    
    return (0);
    
} // main