IOS基礎之繪圖函式的使用

IOS基礎之繪圖函式的使用

//
//  HMView.m
//  25-繪圖步驟
//
//  Created by 魯軍 on 2021/2/14.
//

#import "HMView.h"

@implementation HMView

- (void)drawRect:(CGRect)rect {
    [self test11];
    //NSLog(@"%@",NSStringFromCGRect(rect));
    //{{0, 0}, {300, 300}}  列印的是當前view的bounds
    //[self setNeedsDisplayInRect:rect];
}
-(void)test11{
    //C hua yuan
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextAddArc(ctx, 150, 150, 100, 0, 2*M_PI, 1);
    CGContextStrokePath(ctx);
}

-(void)test10{
    //使用純畫圓函式 繪制圓形
    //ArcCenter 圓心
    //radius 半徑
    //startAngle 起始位置
    //endAngle 結束位置
    //clockwise 是否是順時針 1 逆時針，0，順時針
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(150, 150) radius:100 startAngle:0 endAngle:2*M_PI - M_PI_2 clockwise:YES];
    [path stroke];
}
-(void)test9{
    //C 畫橢圓
    CGContextRef ctx=UIGraphicsGetCurrentContext();
    CGContextAddEllipseInRect(ctx, CGRectMake(10, 10, 150, 100));
    CGContextStrokePath(ctx);
}
-(void)test8{
    //畫橢圓
   // UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 200, 100)];
   // [path stroke];
    //畫圓
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 200, 200)];
    [path stroke];
}

-(void)test7{
    //帶圓角的矩形的繪畫
    //UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(100, 100, 100, 100) cornerRadius:10];
    //[path stroke];
    //畫圓
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(100, 100, 100, 100) cornerRadius:50];
    [path stroke];
}
-(void)test6{
    //繪制矩形
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(100, 100, 100, 100)];
    [path stroke];
    
}

-(void)test5{
    // chun OC fang shi
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(50, 50)];
    [path addLineToPoint:CGPointMake(100, 100)];
    [path stroke];
}
-(void)test4{
    //c + oc
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    //拼接路徑(c)
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 50, 50);
    CGPathAddLineToPoint(path, NULL, 100, 100);
    //拼接路徑(oc)
    UIBezierPath *path1 = [UIBezierPath bezierPathWithCGPath:path];
    [path1 addLineToPoint:CGPointMake(150, 50)];
    //3.路徑添加當前的背景關系
    CGContextAddPath(ctx, path1.CGPath);
    //4渲染
    CGContextStrokePath(ctx);
}
-(void)test3{
    //oc + c
    // 1 獲取 當前背景關系
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    //拼接路徑
    UIBezierPath *path = [[UIBezierPath alloc] init];
    [path moveToPoint:CGPointMake(50, 50)];
    [path addLineToPoint:CGPointMake(100, 250)];
    //3.路徑添加當前的背景關系
    CGContextAddPath(ctx, path.CGPath);
    CGContextStrokePath(ctx);
}
-(void)test2{
    //C的
    // 1 獲取 當前背景關系
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    //2 拼接路徑，
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 50, 50);
    CGPathAddLineToPoint(path, NULL, 100, 200);
    //3.路徑添加當前的背景關系
    CGContextAddPath(ctx, path);
    //4渲染
    CGContextStrokePath(ctx);
}
-(void)test1{
     // 1 獲取 當前背景關系
      CGContextRef ctx = UIGraphicsGetCurrentContext();
     //2 拼接路徑， 同時把路徑添加當前的背景關系
     CGContextMoveToPoint(ctx, 50, 50); //起點
     CGContextAddLineToPoint(ctx, 100, 100);  //終點
     CGContextAddLineToPoint(ctx, 150, 50);  //終點
     CGContextMoveToPoint(ctx, 50, 200); //起點
     CGContextAddLineToPoint(ctx, 200, 200);  //終點
     //3，渲染
     CGContextStrokePath(ctx);
}
@end