过程式编程－绘图程序

#import <Foundation/Foundation.h>
/*------------------------

 
 
 ------------------------*/
//创建一个枚举ShapeType，形状
typedef enum 
{
    kCircle
    ,kRectangle
    ,kOblateSpheroid
    
}ShapeType;

//创建一个枚举ShapeColor，颜色
typedef enum 
{
    kRedcolor
    ,kGreencolor
    ,kBluecolor
    
}ShapeColor;

//创建一个结构体，大小
typedef struct 
{
    int x,y,width,height;
}ShapeRect;

//创建一个结构体，形状主体，包含形状，颜色，大小
typedef struct 
{
    ShapeType  type;          // 形状创建一个实例type
    ShapeColor fillcolor;     // 颜色创建一个实例 fillcolor
    ShapeRect  bounds;        // 形状大小创建一个实例 bounds
}Shape;

//函数声明
void drawShapes(Shape shapes[],int count);
void drawCircle(ShapeRect bounds,ShapeColor fillcolor);
void drawRectangle(ShapeRect bounds,ShapeColor fillcolor);
void drawOblateSpheroid(ShapeRect bounds,ShapeColor fillcolor);
NSString *colorName (ShapeColor colorName);
NSString *colorName (ShapeColor colorName);

//主函数
int main (int argc, const char * argv[])
{
    Shape shapes[3];
    
    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;
    
    drawShapes (shapes,3);
    
    return 0;
}

void drawShapes(Shape shapes[],int count)
{
    int i;
    
    for (i=0; i<count; i++) {
       
        switch (shapes[i].type) {
            case kCircle:
                drawCircle(shapes[i].bounds
                           ,shapes[i].fillcolor);
                break;
                
            case kRectangle:
                drawRectangle(shapes[i].bounds
                           ,shapes[i].fillcolor);
                break;
                
            case kOblateSpheroid:
                drawOblateSpheroid(shapes[i].bounds
                           ,shapes[i].fillcolor);
                break;
                
        }
    }
}

void drawCircle(ShapeRect bounds,ShapeColor fillcolor)
{
    NSLog(@"drawing a circle at (%d %d %d %d) in %@"
          ,bounds.x
          ,bounds.y
          ,bounds.width
          ,bounds.height,colorName(fillcolor));
}//drawCicle

void drawRectangle(ShapeRect bounds,ShapeColor fillcolor)
{
    NSLog(@"drawing a drawRectangle at (%d %d %d %d) in %@"
          ,bounds.x
          ,bounds.y
          ,bounds.width
          ,bounds.height,colorName(fillcolor));
}//drawRectangle

void drawOblateSpheroid(ShapeRect bounds,ShapeColor fillcolor)
{
    NSLog(@"drawing a drawOblateSpheroid at (%d %d %d %d) in %@"
          ,bounds.x
          ,bounds.y
          ,bounds.width
          ,bounds.height,colorName(fillcolor));
}//drawOblateSpheroid

NSString *colorName (ShapeColor colorName)
{
    switch (colorName) {
        case kRedcolor:
            return @"red";
            break;
            
        case kGreencolor:
            return @"green";
            break;
            
        case kBluecolor:
            return @"blue";
            break;
    }
    return @"no clue";
}//colorName