I've trying to do graph like this
But only thing I've got is
I was trying bezier path, but it wont work like i need, just have no idea what to do
that code for bezier
UIBezierPath *path = [UIBezierPath bezierPath];
[path setLineWidth:3.0];
[path setLineCapStyle:kCGLineCapRound];
[path setLineJoinStyle:kCGLineJoinRound];
NSValue *value = [newPoints objectAtIndex:0];
CGPoint p1 = [value CGPointValue];
[path moveToPoint:CGPointMake(0, viewHeight/2)];
for (int k=1; k<[newPoints count];k++) {
NSValue *value = [newPoints objectAtIndex:k];
CGPoint p2 = [value CGPointValue];
CGPoint centerPoint = CGPointMake((p1.x+p2.x)/2, (p1.y+p2.y)/2);
if (p1.y<p2.y) {
centerPoint = CGPointMake(centerPoint.x, centerPoint.y+(fabs(p2.y-centerPoint.y)));
}else if(p1.y>p2.y){
centerPoint = CGPointMake(centerPoint.x, centerPoint.y-(fabs(p2.y-centerPoint.y)));
}
[path addQuadCurveToPoint:p2 controlPoint:centerPoint];
p1 = p2;
}
[path stroke];
it was close to result, but not the same
and I used only top points of graph, not all
current result with this code
or how could I using mask take only things that between bezier line and green line at center? Then i make bars height just all of view and line will cut them like I need
you can try by UIBezierPath , just first use
[urPath moveToPoint:firstPOint];
loop
[urPath addLineToPoint:topOfEveryBar];
Related
I'm drawing a curve between two points with a centerPoint, and I would like to have the bow ends thinner than the center part. I mean, I want different setLineWidth for the ends. Any idea?
UIBezierPath *path = [UIBezierPath bezierPath];
CGPoint p=CGPointMake(posXAbsolutaComienza, posYAbsolutaComienza);
[path moveToPoint:p];
CGPoint p2=CGPointMake(posXAbsolutaAcaba, posYAbsolutaAcaba);
CGPoint centerPoint=CGPointMake(posXAbsolutaIntermedio, posYAbsolutaIntermedio);
[path setLineWidth:grosorLinea];
[path addQuadCurveToPoint:p2 controlPoint:centerPoint];
[[UIColor blackColor] setStroke];
[path stroke];
I'm trying to animate an parallelogram bezier path. But as the size is changed the angles are disproportionately changed. How could I do it to maintain the same shape and the same angle as the first (magenta) ?.
Here is the code and images for you to understand my problem:
- (UIBezierPath *) createPathRisedRect:(CGRect) rect
{
UIBezierPath *path = [[UIBezierPath alloc] init];
const CGFloat RISE = 10;
CGPoint pt0 = CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect));
CGPoint pt1 = CGPointMake(CGRectGetMinX(rect) + RISE, CGRectGetMaxY(rect));
CGPoint pt2 = CGPointMake(CGRectGetMaxX(rect) + RISE, CGRectGetMaxY(rect));
CGPoint pt3 = CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect));
CGPoint pt4 = CGPointMake(CGRectGetMinX(rect), CGRectGetMinY(rect));
[path moveToPoint:pt0];
[path addLineToPoint:pt1];
[path addLineToPoint:pt2];
[path addLineToPoint:pt3];
[path addLineToPoint:pt4];
return path;
}
I am trying to draw 100+ UIBezierPath circles in the drawRect function of an UIView. I am creating and adding the UIBezierPaths to an array:
for (int i = 0; i < 100; i++) {
UIBezierPath *path = [UIBezierPath bezierPath];
[path addArcWithCenter:centerPoint radius:10 startAngle:0 endAngle:360 clockwise:YES];
path.lineWidth = 2;
[bezierPaths addObject:path];
}
before calling the setNeedDisplay. Then in drawRect I iterate through the array
- (void)drawRect:(CGRect)rect {
for (UIBezierPath *path in bezierPaths) {
[path fill];
[path stroke];
}
}
This looks like an overkill, is there a better way of doing this? Using Profile I can see that the 86% of the MainThread is being used on calling the [path stroke] in drawRect.
I am passing 0 and 360 degrees as opposed to radiants and it is drawing them too many times.
Hiiii
I'm trying to draw in a view an arc with dynamic width.
I have built an ARRAY with several UIBezierPath with arcs then I draw one after the other. this is the code:
- (void)drawRect:(CGRect)rect
{
// Drawing code
CGFloat radious;
if (self.bounds.size.width < self.bounds.size.height) {
radious = self.bounds.size.width / 2;
}
else{
radious = self.bounds.size.height / 2;
}
float oneGradeInRadians = (float)(2 * M_PI) / 360.f;
float radiandToDraw = (float)self.finalAngleRadians - self.initialAngleRadians;
float splitMeasure = oneGradeInRadians;
int numberOfArcs = radiandToDraw / splitMeasure;
NSMutableArray *arrayOfBeziersPaths = [NSMutableArray arrayWithCapacity:numberOfArcs];
for (int i = 0; i < numberOfArcs; i++) {
float startAngle = self.initialAngleRadians + (i * splitMeasure);
float endAngle = self.initialAngleRadians +((i + 1) * splitMeasure);
UIBezierPath *bezierPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2) radius:radious - self.widthLine.floatValue startAngle:startAngle endAngle:endAngle clockwise:YES];
bezierPath.lineWidth = self.widthLine.floatValue + i/20;
float hue = (float)(i / 3.f);
UIColor *color = [UIColor colorWithHue:hue/360.0 saturation:1 brightness:1 alpha:1];
[color setStroke];
[arrayOfBeziersPaths addObject:bezierPath];
}
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineJoin(context, kCGLineJoinMiter);
//We saved the context
CGContextSaveGState(context);
for (int i = 0; i < numberOfArcs; i++) {
[(UIBezierPath *)[arrayOfBeziersPaths objectAtIndex:i] stroke];
[(UIBezierPath *)[arrayOfBeziersPaths objectAtIndex:i] fill];
}
//Restore the contex
CGContextRestoreGState(context);
}
In this way I get the right shape but, also I get an annoying lines between the arcs:
I think the problem may be a property to change between arcs, but I'm totally lost, or maybe there is another better way to build this.
I tried creating several UIBezierPath paths and I added them to an unique UIBezierPath, then I stoke and fill that path. I didn't get the annoying lines, but the problem is I can not modify the line width, so I can not get the same effect.
Any idea? thanks
dont create many such paths. just create two arcs (inner circle, exterior circle) and two straight lines joining the ends. then fill the path.
Add below code in a viewDidLoad of an empty viewController and check.
- (void)viewDidLoad
{
[super viewDidLoad];
CGFloat k =0.5522847498;
UIBezierPath *path =[UIBezierPath bezierPath];
CGFloat radius=130;
[path addArcWithCenter:CGPointMake(0, 0) radius:radius startAngle:M_PI_2 endAngle:M_PI clockwise:NO];
CGFloat start=10;
CGFloat increment=5;
[path addLineToPoint:CGPointMake(-radius-start, 0)];
[path addCurveToPoint:CGPointMake(0, -radius-start-increment) controlPoint1:CGPointMake(-radius-start, -(radius +start)*k) controlPoint2:CGPointMake(-(radius+start)*k, -radius-start-increment)];
[path addCurveToPoint:CGPointMake(radius+start+2*increment, 0) controlPoint1:CGPointMake((radius+start+increment)*k, -radius-start-increment) controlPoint2:CGPointMake(radius+start+2*increment, (-radius-start-increment)*k)];
[path addCurveToPoint:CGPointMake(0, radius+start+3*increment) controlPoint1:CGPointMake(radius+start+2*increment, (radius+start+2*increment)*k) controlPoint2:CGPointMake((radius+start+2*increment)*k,radius+start+3*increment)];
[path addLineToPoint:CGPointMake(0,radius)];
CAShapeLayer *layer =[CAShapeLayer layer];
[layer setFrame:CGRectMake(150, 200, 300, 300)];
[layer setFillColor:[UIColor greenColor].CGColor];
[layer setStrokeColor:[UIColor blackColor].CGColor];
[layer setPath:path.CGPath];
[self.view.layer addSublayer:layer];
}
It produced result like,
The problem here is that you’ve chosen a crazy approach to drawing the shape you’re after. If you take a look at it, you’ll see that it’s actually a filled region bounded on the outside by a circular arc, and on the inner edge by a spiral.
What you should do, therefore, is create a single NSBezierPath, add the outer circular arc to it, then add a line to the start of your spiral, append a spiral (you’ll want to approximate it with Bézier segments) and finally call -closePath. After that, you can -fill the path and you’ll get a good looking result rather than the mess you have above.
What is the best way to draw a bezier curve, in iOS application, that passes through a set of given points
A little more generic way to do it can be achieved by, for example, looking at the BEMSimpleLineGraph GitHub Project (see here for more info: bemsimplelinegraph). Here I extracted a method to draw a bezier curve through a given list of points.
The header file (BezierLine.h):
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <CoreGraphics/CoreGraphics.h>
#interface BezierLine : NSObject
/*
Draws a bezier curved line on the given context
with points: Array of CGPoint values
*/
-(void) drawBezierCurveInContext:(CGContextRef)context withPoints:(NSArray*)points lineColor:(UIColor*)color lineWidth:(CGFloat)lineWidth;
#end
The implementation (BezierLine.m):
#import "BezierLine.h"
#implementation BezierLine
-(void) drawBezierCurveInContext:(CGContextRef)context withPoints:(NSArray*)points lineColor:(UIColor*)color lineWidth:(CGFloat)lineWidth {
if (points.count < 2) return;
CGPoint CP1;
CGPoint CP2;
// LINE
UIBezierPath *line = [UIBezierPath bezierPath];
CGPoint p0;
CGPoint p1;
CGPoint p2;
CGPoint p3;
CGFloat tensionBezier1 = 0.3;
CGFloat tensionBezier2 = 0.3;
CGPoint previousPoint1;
CGPoint previousPoint2;
[line moveToPoint:[[points objectAtIndex:0] CGPointValue]];
for (int i = 0; i < points.count - 1; i++) {
p1 = [[points objectAtIndex:i] CGPointValue];
p2 = [[points objectAtIndex:i + 1] CGPointValue];
const CGFloat maxTension = 1.0f / 3.0f;
tensionBezier1 = maxTension;
tensionBezier2 = maxTension;
if (i > 0) { // Exception for first line because there is no previous point
p0 = previousPoint1;
if (p2.y - p1.y == p1.y - p0.y) tensionBezier1 = 0;
} else {
tensionBezier1 = 0;
p0 = p1;
}
if (i < points.count - 2) { // Exception for last line because there is no next point
p3 = [[points objectAtIndex:i + 2] CGPointValue];
if (p3.y - p2.y == p2.y - p1.y) tensionBezier2 = 0;
} else {
p3 = p2;
tensionBezier2 = 0;
}
// The tension should never exceed 0.3
if (tensionBezier1 > maxTension) tensionBezier1 = maxTension;
if (tensionBezier2 > maxTension) tensionBezier2 = maxTension;
// First control point
CP1 = CGPointMake(p1.x + (p2.x - p1.x)/3,
p1.y - (p1.y - p2.y)/3 - (p0.y - p1.y)*tensionBezier1);
// Second control point
CP2 = CGPointMake(p1.x + 2*(p2.x - p1.x)/3,
(p1.y - 2*(p1.y - p2.y)/3) + (p2.y - p3.y)*tensionBezier2);
[line addCurveToPoint:p2 controlPoint1:CP1 controlPoint2:CP2];
previousPoint1 = p1;
previousPoint2 = p2;
}
CGContextSetAllowsAntialiasing(context, YES);
CGContextSetStrokeColorWithColor(context, color.CGColor);
CGContextSetLineWidth(context, lineWidth);
CGContextAddPath(context, line.CGPath);
CGContextDrawPath(context, kCGPathStroke);
}
#end
You can use it by for example creating an image context using UIGraphicsBeginImageContext and retrieving the context with UIGraphicsGetCurrentContext().
Otherwise you may want to change the code and assign the resulting Path to a CALayer and add that to an UIView.
Hope this helps.
I know this might be late, but just for anyone who is looking for the right answer. Instead of using addLineToPoint to draw the straight line. You can use addCurveToPoint to draw the curve. e.g.
[bezierPath moveToPoint:CGPointMake(0, 0)];
[bezierPath addCurveToPoint:CGPointMake(40, 100)
controlPoint1:CGPointMake(20, 0)
controlPoint2:CGPointMake(20, 100)];
[bezierPath addCurveToPoint:CGPointMake(80, 50)
controlPoint1:CGPointMake(60, 100)
controlPoint2:CGPointMake(60, 50)];
// and you may don't want to close the path
// [bezierPath closePath];
It's really up to you to choose the control points of the curve. I just use the x = last_point_x + 20; y = last_point_y for control point one, and x = current_point_x - 20; y = current_point_y;
and you may want to use other value instead of the 20 as you may have different segment width of the curve.
You can easily google some example of how to create bezier curve on the web. I found this short tut as an example.
You can create a close bezier curve for e.g. with the following code snippet:
UIBezierPath* path = [UIBezierPath bezierPath];
[path moveToPoint:pt1];
[path addLineToPoint:pt2];
[path addLineToPoint:pt3];
[path closePath];
I hope it will help as a starting point.
Please try this.
UIImageView *waterLevel = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,200,200)];
UIGraphicsBeginImageContext(waterLevel.frame.size);
[waterLevel.image drawAtPoint:CGPointZero];
//define BezierPath
UIBezierPath *bezierPath = [UIBezierPath bezierPath];
// Set the starting point of the shape.
[bezierPath moveToPoint:CGPointMake(0, 0)];
[bezierPath addLineToPoint:CGPointMake(waterLevel.frame.size.width, 0)];
[bezierPath addLineToPoint:CGPointMake(waterLevel.frame.size.width, waterLevel.frame.size.height)];
[bezierPath addLineToPoint:CGPointMake(0, waterLevel.frame.size.height)];
[bezierPath closePath];
bezierPath.lineWidth = 15;
//set the stoke color
[[UIColor blackColor] setStroke];
//draw the path
[bezierPath stroke];
// Add to the current Graphic context
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddPath(context,bezierPath.CGPath);
waterLevel.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.view addSubview:waterLevel];
You can be much more efficient by using the CGPointFromString method:
NSArray *pointArray = #[#"{3.0,2.5}",#"{100.0,30.2}", #"{100.0,200.0}", #"{3.0,200.0}"];
// draw the path
UIBezierPath *aPath = [UIBezierPath bezierPath];
for (NSString *pointString in pointArray) {
if ([pointArray indexOfObject:pointString] == 0)
[aPath moveToPoint:CGPointFromString(pointString)];
else
[aPath addLineToPoint:CGPointFromString(pointString)];
}
[aPath closePath];
UIBezierPath *aPath = [UIBezierPath bezierPath];
// 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];