#import <Foundation/Foundation.h> // -------------------------------------------------- // constants for the different kinds of shapes and their colors typedef enum { kCircle, kRectangle, kOblateSpheroid } ShapeType; typedef enum { kRedColor, kGreenColor, kBlueColor } ShapeColor; // -------------------------------------------------- // Shape bounding rectangle typedef struct { int x, y, width, height; } ShapeRect; // -------------------------------------------------- // The Shape typedef struct { ShapeType type; ShapeColor fillColor; ShapeRect bounds; } Shape; // -------------------------------------------------- // convert from the ShapeColor enum value to a human-readable name 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 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)); } // drawCircle 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)); } // drawRectangle void drawEgg (ShapeRect bounds, ShapeColor fillColor) { NSLog (@"drawing an egg at (%d %d %d %d) in %@", bounds.x, bounds.y, bounds.width, bounds.height, colorName(fillColor)); } // drawEgg // -------------------------------------------------- // Draw the shapes void drawShapes (Shape shapes[], int count) { for (int 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: drawEgg (shapes[i].bounds, shapes[i].fillColor); break; } } } // drawShapes // -------------------------------------------------- // The main function. Make the shapes and draw them 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); }
运行结果:
drawing a circle at (0 0 10 30) in red
drawing a rectangle at (30 40 50 60) in green
drawing an egg at (15 18 37 29) in blue
drawing a triangle at (47 32 80 50) in red