iOS 劃線總結

/*

 提示：如果是畫線，那麼就創建一條路徑（path）用來保存畫線的繪圖信息，如果又要重新畫一個圓，那麼就可以創建一條新的路徑來專門保存畫圓的繪圖信息。

 凡通過quarzt2d中帶有creat/copy/retain方法創建出來的值都必須手動的釋放

 有兩種方法可以釋放前面創建的路徑：

 （1）CGPathRelease(path);

 （2）CFRelease(path);

 說明：CFRelease屬於更底層的cocafoundation框架

 */

//畫矩形

- (void)drawRectangle:(CGRect)rect {
   
    //得到上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //定義一個畫圖的軌跡
    CGMutablePathRef pathRef = [self pathwithFrame:rect withRadius:0];
    //添加到上下文中
    CGContextAddPath(context, pathRef);
    //畫圖
    CGContextDrawPath(context, kCGPathFillStroke);
}

//畫直線
- (void)drawLineFrom:(CGPoint)startPoint to:(CGPoint)endPoint {
    //得到上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //畫圖
    CGContextMoveToPoint(context, startPoint.x, startPoint.y);
    CGContextAddLineToPoint(context, endPoint.x, endPoint.y);
    
    CGContextStrokePath(context);
    
}

//圓形
-(void)drawCircleWithCenter:(CGPoint)center
                     radius:(float)radius {
    //得到上下文
    CGContextRef content = UIGraphicsGetCurrentContext();
    //創建一條畫圖路徑
    //注意：但凡通過Quartz2D中帶有creat/copy/retain方法創建出來的值都必須要釋放
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddArc(path, &CGAffineTransformIdentity, center.x, center.y,radius, -PI/2, radius*2*PI-PI/2, NO);
    //清楚路徑
    CGPathCloseSubpath(path);
    //保存到圖文上下文
    CGContextAddPath(content, path);
    //渲染
    CGContextDrawPath(content, kCGPathFillStroke);
    //釋放路徑
    CGPathRelease(path);
    //把園的繪圖信息添加到路徑裏
      // CGPathAddEllipseInRect(path, nil, <#CGRect rect#>)
}
//曲線
-(void)drawCurveFrom:(CGPoint)startPoint
                  to:(CGPoint)endPoint
       controlPoint1:(CGPoint)controlPoint1
       controlPoint2:(CGPoint)controlPoint2 {
    //得到圖形上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //設定一個點
    CGContextMoveToPoint(context, startPoint.x, startPoint.y);
    //添加一個曲線
    CGContextAddCurveToPoint(context, controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y, endPoint.x, endPoint.y);
    //渲染曲線
    CGContextDrawPath(context, kCGPathStroke);
}
//弧線
-(void)drawArcFromCenter:(CGPoint)center
                  radius:(float)radius
              startAngle:(float)startAngle
                endAngle:(float)endAngle
               clockwise:(BOOL)clockwise
{
    CGContextRef     context = UIGraphicsGetCurrentContext();
    
    CGContextAddArc(context,
                    center.x,
                    center.y,
                    radius,
                    startAngle,
                    endAngle,
                    clockwise?0:1);
    
    CGContextStrokePath(context);
}

-(void)drawLines:(NSArray *)pointArray
{
    
    NSAssert(pointArray.count>=2,@"數組長度必須大於等於2");
    NSAssert([[pointArray[0] class] isSubclassOfClass:[NSValue class]], @"數組成員必須是CGPoint組成的NSValue");
    
    CGContextRef     context = UIGraphicsGetCurrentContext();
    
    NSValue *startPointValue = pointArray[0];
    CGPoint  startPoint      = [startPointValue CGPointValue];
    CGContextMoveToPoint(context, startPoint.x, startPoint.y);
    
    for(int i = 1;i<pointArray.count;i++)
    {
        NSAssert([[pointArray[i] class] isSubclassOfClass:[NSValue class]], @"數組成員必須是CGPoint組成的NSValue");
        NSValue *pointValue = pointArray[i];
        CGPoint  point      = [pointValue CGPointValue];
        CGContextAddLineToPoint(context, point.x,point.y);
    }
    
    CGContextStrokePath(context);
}

//動態折線圖
- (void)drawLInes:(CGPoint)onpoint points:(NSArray *)points{
   
    NSAssert(points.count>=2,@"數組長度必須大於等於2");
    NSAssert([[points[0] class] isSubclassOfClass:[NSValue class]], @"數組成員必須是CGPoint組成的NSValue");
    [self setNeedsDisplay];
    
    
    
    [self drawLinean:CGPointMake(onpoint.x, 100) to:CGPointMake(onpoint.x+300, 100)];
    
    UIBezierPath *path = [UIBezierPath bezierPath];
   
    [path moveToPoint:onpoint];
    for (int i= 0; i < points.count; i++) {
         NSAssert([[points[i] class] isSubclassOfClass:[NSValue class]], @"數組成員必須是CGPoint組成的NSValue");
          NSValue *point = points[i];
         [path addLineToPoint:[point CGPointValue]];
       
    }
    
     NSLog(@"開始%f  結束 %@ ",onpoint.y,[points lastObject]);
    CAShapeLayer *pathLayer = [CAShapeLayer layer];
    pathLayer.frame = self.bounds;
    pathLayer.path = path.CGPath;
    pathLayer.strokeColor = [[UIColor redColor] CGColor];
    pathLayer.fillColor = nil;
    pathLayer.lineWidth = 1.0f;
    pathLayer.lineJoin = kCALineJoinRound;
    [self.layer addSublayer:pathLayer];
    
    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation.duration = 3.0;
    pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
    pathAnimation.toValue = [NSNumber numberWithFloat:2.0f];
    [pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];
    
}


#pragma ---------func

- (void)drawLinean:(CGPoint)startpoint to:(CGPoint)point {
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    [path moveToPoint:startpoint];
    [path addLineToPoint:point];
    
    CAShapeLayer *pathLayer = [CAShapeLayer layer];
    pathLayer.frame = self.bounds;
    pathLayer.path = path.CGPath;
    pathLayer.strokeColor = [[UIColor colorWithRed:80.f/255.f
                                             green:150.f/255.f
                                              blue:225.f/255.f
                                             alpha:1] CGColor];
    pathLayer.fillColor = nil;
    pathLayer.lineWidth = 1.0f;
    pathLayer.lineJoin = kCALineJoinRound;
    [self.layer addSublayer:pathLayer];
    
    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    pathAnimation.duration = 3.0;
    pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
    pathAnimation.toValue = [NSNumber numberWithFloat:2.0f];
    [pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];
    
}


- (CGMutablePathRef)pathwithFrame:(CGRect)frame withRadius:(CGFloat)radius {
    //設置矩形的四個點
    CGPoint x1,x2,x3,x4;
    x1 = frame.origin;
    x2 = CGPointMake(frame.origin.x+frame.size.width, frame.origin.y);
    x3 = CGPointMake(frame.origin.x+frame.size.width, frame.origin.y+frame.size.height);
    x4 = CGPointMake(frame.origin.x, frame.origin.y+frame.size.height);
    
    
    CGMutablePathRef pathRef = CGPathCreateMutable();
    CGPathMoveToPoint(pathRef, &CGAffineTransformIdentity,x1.x,x1.y);
    CGPathAddLineToPoint(pathRef, &CGAffineTransformIdentity, x2.x,x2.y);
    CGPathAddLineToPoint(pathRef, &CGAffineTransformIdentity, x3.x,x3.y);
    CGPathAddLineToPoint(pathRef, &CGAffineTransformIdentity, x4.x,x4.y);
     CGPathCloseSubpath(pathRef);
    return pathRef;
    
}