Quartz2D(二)之绘图方式

绘图方式

• 方式一:C语言的方式

  - (void)drawRect:(CGRect)rect
  {
      CGContextRef ctx = UIGraphicsGetCurrentContext();
      CGContextMoveToPoint(ctx,50, 50);
      CGContextAddLineToPoint(ctx, 110, 120);
      CGContextAddLineToPoint(ctx, 150, 40);
      CGContextSetLineWidth(ctx, 10);
      CGContextSetLineCap(ctx, 1);
      CGContextSetLineJoin(ctx, 1);
  
      CGContextStrokePath(ctx);
  }
  

• 方式二:C语言的方式之path

  - (void)drawRect:(CGRect)rect
  {
      CGContextRef ctx = UIGraphicsGetCurrentContext();
  
      // 获取路径
      CGMutablePathRef path = CGPathCreateMutable();
      CGPathMoveToPoint(path, NULL, 50, 50);
      CGPathAddLineToPoint(path, NULL, 110, 120);
      // 将路径添加到上下文中
      CGContextAddPath(ctx, path);
  
      CGContextStrokePath(ctx)
  }
  

• 方式三:BezierPath

  - (void)drawRect:(CGRect)rect
  {
      CGContextRef ctx = UIGraphicsGetCurrentContext();
  
      UIBezierPath *path = [[UIBezierPath alloc]init];
      [path moveToPoint:CGPointMake(50, 50)];
      [path addLineToPoint:CGPointMake(110, 120)];
      CGContextAddPath(ctx, path.CGPath);
  
      CGContextStrokePath(ctx);
  }
  

• 方式四:C(CGPath) + OC(UIBezierPath)

  - (void)drawRect:(CGRect)rect
  {
      CGContextRef ctx = UIGraphicsGetCurrentContext();
  
      CGMutablePathRef path = CGPathCreateMutable();
      CGPathMoveToPoint(path, NULL, 50, 50);
      CGPathAddLineToPoint(path, NULL, 110, 120);
  
      // 把c的路径CGPath转成oc的路径bezierPath
      UIBezierPath *path1 = [UIBezierPath bezierPathWithCGPath:path];
      [path1 addLineToPoint:CGPointMake(80, 80)];
  
      // 把路径添加到上下文中
      CGContextAddPath(ctx, path1.CGPath);
  
      CGContextStrokePath(ctx);
  
  }
  

• 方式五:纯OC实现

  - (void)drawRect:(CGRect)rect
  {
      UIBezierPath *path = [UIBezierPath bezierPath];
      [path moveToPoint:CGPointMake(50, 50)];
      [path addLineToPoint:CGPointMake(110, 120)];
      [path stroke];
  }