UIBezierPath学习
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感谢:http://blog.csdn.net/crayondeng/article/details/11093689
使用UIBezierPath类可以创建基于矢量的路径,这个类在UIKit中。此类是Core Graphics框架关于path的一个封装。使用此类可以定义简单的形状,如椭圆或者矩形,或者有多个直线和曲线段组成的形状。
- // Only override drawRect: if you perform custom drawing.
- // An empty implementation adversely affects performance during animation.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- // Set the starting point of the shape.
- [aPath moveToPoint:CGPointMake(100.0, 0.0)];
- // Draw the lines
- [aPath addLineToPoint:CGPointMake(200.0, 40.0)];
- [aPath addLineToPoint:CGPointMake(160, 140)];
- [aPath addLineToPoint:CGPointMake(40.0, 140)];
- [aPath addLineToPoint:CGPointMake(0.0, 40.0)];
- [aPath closePath];//第五条线通过调用closePath方法得到的
- [aPath stroke];//Draws line 根据坐标点连线
- }
- Creates and returns a new UIBezierPath object initialized with a rectangular path.
- + (UIBezierPath *)bezierPathWithRect:(CGRect)rect
demo代码:
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, 100, 50)];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath stroke];
- }
4、使用UIBezierPath创建圆形或者椭圆形
- Creates and returns a new UIBezierPath object initialized with an oval path inscribed in the specified rectangle
- + (UIBezierPath *)bezierPathWithOvalInRect:(CGRect)rect
这个方法根据传入的rect矩形参数绘制一个内切曲线。
- Creates and returns a new UIBezierPath object initialized with an arc of a circle.
- + (UIBezierPath *)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise
- Parameters
- center
- Specifies the center point of the circle (in the current coordinate system) used to define the arc.
- radius
- Specifies the radius of the circle used to define the arc.
- startAngle
- Specifies the starting angle of the arc (measured in radians).
- endAngle
- Specifies the end angle of the arc (measured in radians).
- clockwise
- The direction in which to draw the arc.
- Return Value
- A new path object with the specified arc.
- #define pi 3.14159265359
- #define DEGREES_TO_RADIANS(degrees) ((pi * degrees)/ 180)
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(150, 150)
- radius:75
- startAngle:0
- endAngle:DEGREES_TO_RADIANS(135)
- clockwise:YES];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath stroke];
- }
- Appends a quadratic Bézier curve to the receiver’s path.
- - (void)addQuadCurveToPoint:(CGPoint)endPoint controlPoint:(CGPoint)controlPoint
- Parameters
- endPoint
- The end point of the curve.
- controlPoint
- The control point of the curve.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath moveToPoint:CGPointMake(20, 100)];
- [aPath addQuadCurveToPoint:CGPointMake(120, 100) controlPoint:CGPointMake(70, 0)];
- [aPath stroke];
- }
- Appends a cubic Bézier curve to the receiver’s path.
- - (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2
- Parameters
- endPoint
- The end point of the curve.
- controlPoint1
- The first control point to use when computing the curve.
- controlPoint2
- The second control point to use when computing the curve.
- - (void)drawRect:(CGRect)rect
- {
- UIColor *color = [UIColor redColor];
- [color set]; //设置线条颜色
- UIBezierPath* aPath = [UIBezierPath bezierPath];
- aPath.lineWidth = 5.0;
- aPath.lineCapStyle = kCGLineCapRound; //线条拐角
- aPath.lineJoinStyle = kCGLineCapRound; //终点处理
- [aPath moveToPoint:CGPointMake(20, 50)];
- [aPath addCurveToPoint:CGPointMake(200, 50) controlPoint1:CGPointMake(110, 0) controlPoint2:CGPointMake(110, 100)];
- [aPath stroke];
- }
// Create the path data
CGMutablePathRef cgPath = CGPathCreateMutable();
CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(0, 0, 300, 300));
CGPathAddEllipseInRect(cgPath, NULL, CGRectMake(50, 50, 200, 200));
// Now create the UIBezierPath object
UIBezierPath* aPath = [UIBezierPath bezierPath];
aPath.CGPath = cgPath;
aPath.usesEvenOddFillRule = YES;
// After assigning it to the UIBezierPath object, you can release
// your CGPathRef data type safely.
CGPathRelease(cgPath);
Mixing Core Graphics and UIBezierPath
calls
UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 300, 300)];
// Get the CGPathRef and create a mutable version.
CGPathRef cgPath = aPath.CGPath;
CGMutablePathRef mutablePath = CGPathCreateMutableCopy(cgPath);
// Modify the path and assign it back to the UIBezierPath object
CGPathAddEllipseInRect(mutablePath, NULL, CGRectMake(50, 50, 200, 200));
aPath.CGPath = mutablePath;
// Release both the mutable copy of the path.
CGPathRelease(mutablePath);
Drawing a path in a view
- (void)drawRect:(CGRect)rect
{
// Create an oval shape to draw.
UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:
CGRectMake(0, 0, 200, 100)];
// Set the render colors
[[UIColor blackColor] setStroke];
[[UIColor redColor] setFill];
CGContextRef aRef = UIGraphicsGetCurrentContext();
// If you have content to draw after the shape,
// save the current state before changing the transform
//CGContextSaveGState(aRef);
// Adjust the view's origin temporarily. The oval is
// now drawn relative to the new origin point.
CGContextTranslateCTM(aRef, 50, 50);
// Adjust the drawing options as needed.
aPath.lineWidth = 5;
// Fill the path before stroking it so that the fill
// color does not obscure the stroked line.
[aPath fill];
[aPath stroke];
// Restore the graphics state before drawing any other content.
//CGContextRestoreGState(aRef);
}
#import "MyView.h"
#define kArrowHeight 10.f
#define kArrowCurvature 6.f
#define RGB(r, g, b) [UIColor colorWithRed:(r)/255.f green:(g)/255.f blue:(b)/255.f alpha:1.f]
@implementation MyView
- (void)drawRect:(CGRect)rect
{
//[self.borderColor set]; //设置线条颜色
CGRect frame = CGRectMake(0, 10, self.bounds.size.width, self.bounds.size.height - kArrowHeight);
float xMin = CGRectGetMinX(frame);
float yMin = CGRectGetMinY(frame);
float xMax = CGRectGetMaxX(frame);
float yMax = CGRectGetMaxY(frame);
//XMin = 0,YMin = 10;XMax= 300;YMax = 400;
CGPoint arrowPoint = CGPointMake(45.5039978, 0);
UIBezierPath *popoverPath = [UIBezierPath bezierPath];
[popoverPath moveToPoint:CGPointMake(xMin, yMin)];//左上角
popoverPath.lineWidth = 1.0f;
/********************向上的箭头**********************/
[popoverPath addLineToPoint:CGPointMake(arrowPoint.x - kArrowHeight, yMin)];//left side
[popoverPath addCurveToPoint:arrowPoint
controlPoint1:CGPointMake(arrowPoint.x - kArrowHeight + kArrowCurvature, yMin)
controlPoint2:arrowPoint];//actual arrow point
[popoverPath addCurveToPoint:CGPointMake(arrowPoint.x + kArrowHeight, yMin)
controlPoint1:arrowPoint
controlPoint2:CGPointMake(arrowPoint.x + kArrowHeight - kArrowCurvature, yMin)];//right side
/********************向上的箭头**********************/
[popoverPath addLineToPoint:CGPointMake(xMax, yMin)];//右上角
[popoverPath addLineToPoint:CGPointMake(xMax, yMax)];//右下角
[popoverPath addLineToPoint:CGPointMake(xMin, yMax)];//左下角
//填充颜色
[RGB(245, 245, 245) setFill];
[popoverPath fill];
[popoverPath closePath];
[popoverPath stroke];
}
@end
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