过程式编程 drawShapes

//
//  main.m
//  3.2.1 过程式编程

#import <Foundation/Foundation.h>
typedef enum {
    kCircle,
    kRectangle,
    kOblateSpheroid,
    kTriangle
}ShapeType;
//绘制形状时可用的颜色
typedef enum {
    kRedColor,
    kGreenColor,
    kBlueCOlor,
}ShapeColor;

typedef struct {
    int x,y,width,height;
}ShapeRect;

typedef struct {
    ShapeType type;
    ShapeColor  fillColor;
    ShapeRect bounds;
}Shape;

//声明函数体
NSString *colorName(ShapeColor colorName);

void drawCirele(ShapeRect bounds,ShapeColor fillColor);

void drawShapes(Shape shapes[], int count);

int main(int argc, const char * argv[]) {
    Shape shapes[4];
    
    ShapeRect rect0 = {0,0,10,30};
    shapes[0].type = kCircle;
    shapes[0].fillColor = kRedColor;
    shapes[0].bounds = rect0;
    
    ShapeRect rect1 = {30,40,50,60};
    shapes[1].type = kRectangle;
    shapes[1].fillColor = kGreenColor;
    shapes[1].bounds = rect1;
    
    ShapeRect rect2 = {15,18,37,29};
    shapes[2].type = kOblateSpheroid;
    shapes[2].fillColor = kBlueCOlor;
    shapes[2].bounds = rect2;
    
    ShapeRect rect3 = {47,32,80,50};
    shapes[2].type = kTriangle;
    shapes[2].fillColor = kRedColor;
    shapes[2].bounds = rect3;
    
    drawShapes(shapes,4);
    
    return 0;
}
NSString *colorName(ShapeColor colorName){
    switch (colorName) {
        case kRedColor:
            return @"red";
            break;
        case kBlueCOlor:
            return @"blue";
            break;
        case kGreenColor:
            return @"green";
            break;
            
        default:
            break;
    }
    return @"no clue";
}

//此函数仅输出有边框的矩形和传递给它的颜色;
void drawCirele(ShapeRect bounds,ShapeColor fillColor){
    NSLog(@"drawing a cirecle at(%d %d %d %d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}
//长方形
void drawRectangle(ShapeRect bounds,ShapeColor fillColor){
    NSLog(@"drawing a Rectangle at(%d %d %d %d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}
//椭圆
void drawEgg(ShapeRect bounds,ShapeColor fillColor){
    NSLog(@"drawing a Egg at(%d %d %d %d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}
//新增三角形
void drawTriangle(ShapeRect bounds,ShapeColor fillColor){
    NSLog(@"drawing a Egg at(%d %d %d %d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}


void drawShapes(Shape shapes[], int count){
    int i ;
    for (i = 0; i<count; i++) {
        switch (shapes[i].type) {
            case kCircle:
                drawCirele(shapes[i].bounds,shapes[i].fillColor);
                break;
            case kRectangle:
                drawRectangle(shapes[i].bounds,shapes[i].fillColor);
                break;
            case kOblateSpheroid:
                drawEgg(shapes[i].bounds,shapes[i].fillColor);
                break;
            case kTriangle:
                drawTriangle(shapes[i].bounds,shapes[i].fillColor);
                break;
            default:
                break;
        }
    }
}