I want to draw lines on a view, here's my code.
- (void)drawRect:(CGRect)rect {
[self.image drawInRect:self.bounds];
}
- (void)drawNewLine {
UIGraphicsBeginImageContext(self.bounds.size);
[self.image drawInRect:self.bounds];
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetRGBStrokeColor(ctx, 0.51, 0.85, 0.81, 1);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 4.0);
CGContextBeginPath(ctx);
CGPoint mid1 = midPoint(previousPoint1, previousPoint2);
CGPoint mid2 = midPoint(currentPoint, previousPoint1);
CGContextMoveToPoint(ctx, mid1.x, mid1.y);
CGContextAddQuadCurveToPoint(ctx, previousPoint1.x, previousPoint1.y, mid2.x, mid2.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
self.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self setNeedsDisplay];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[recognizer resetTouches];
[recognizer addTouches:touches fromView:self];
self.image = nil;
previousPoint1 = previousPoint2 = currentPoint = [[touches anyObject] locationInView:self];
[self setNeedsDisplay];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
previousPoint2 = previousPoint1;
previousPoint1 = currentPoint;
currentPoint = [[touches anyObject] locationInView:self];
[self drawNewLine];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self drawNewLine];
[self processGestureData];
}
It worked fine on other devices except iPhone plus, on 6/6s/7 plus, you can see the clear lag. Can someone please tell me where I did wrong. Thanks a lot.
Here's my app. CallHoney
Related
In my xcode project, the user draws an object manually. So for example they can draw a apple or triangle.
I need to save I guess the coordinates or the line path of what they draw.
How can I store the line path or re-create the image that the user has drawn. I don't want to save the image, but I want to learn from the image the user drew by knowing the specific line path?
Here is the code
.h
int mouseMoved;
BOOL mouseSwiped;
CGPoint lastPoint;
UIImageView *drawImage;
viewdidload {
drawImage = [[UIImageView alloc] initWithImage:nil];
drawImage.frame = self.view.frame;
[self.view addSubview:drawImage];
self.view.backgroundColor = [UIColor lightGrayColor];
mouseMoved = 0;
}
.m
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
BOOL mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
drawImage.image = nil;
return;
}
lastPoint = [touch locationInView:self.view];
lastPoint.y -= 20;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y -= 20;
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
mouseMoved++;
if (mouseMoved == 10) {
mouseMoved = 0;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
drawImage.image = nil;
return;
}
_startPoint = [touch locationInView:self.view];
if(!mouseSwiped) {
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
-(void)digitalSignatureCalled{
//viewSign.backgroundColor = [UIColor lightGrayColor];
//create a frame for our signature capture based on whats remaining
imageFrame = CGRectMake(0, 50, 500, 450);
//allocate an image view and add to the main view
mySignatureImage = [[UIImageView alloc] initWithImage:nil];
mySignatureImage.frame = imageFrame;
mySignatureImage.backgroundColor = [UIColor whiteColor];
[viewSign addSubview:mySignatureImage];
}
//when one or more fingers touch down in a view or window
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//did our finger moved yet?
fingerMoved = NO;
UITouch *touch = [touches anyObject];
//just clear the image if the user tapped twice on the screen
if ([touch tapCount] == 2) {
mySignatureImage.image = nil;
return;
}
//we need 3 points of contact to make our signature smooth using quadratic bezier curve
currentPoint = [touch locationInView:mySignatureImage];
lastContactPoint1 = [touch previousLocationInView:mySignatureImage];
lastContactPoint2 = [touch previousLocationInView:mySignatureImage];
}
//when one or more fingers associated with an event move within a view or window
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
//well its obvious that our finger moved on the screen
fingerMoved = YES;
UITouch *touch = [touches anyObject];
//save previous contact locations
lastContactPoint2 = lastContactPoint1;
lastContactPoint1 = [touch previousLocationInView:mySignatureImage];
//save current location
currentPoint = [touch locationInView:mySignatureImage];
//find mid points to be used for quadratic bezier curve
CGPoint midPoint1 = [self midPoint:lastContactPoint1 withPoint:lastContactPoint2];
CGPoint midPoint2 = [self midPoint:currentPoint withPoint:lastContactPoint1];
//create a bitmap-based graphics context and makes it the current context
UIGraphicsBeginImageContext(imageFrame.size);
//draw the entire image in the specified rectangle frame
[mySignatureImage.image drawInRect:CGRectMake(0, 0, imageFrame.size.width, imageFrame.size.height)];
//set line cap, width, stroke color and begin path
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 3.0f);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
//begin a new new subpath at this point
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), midPoint1.x, midPoint1.y);
//create quadratic Bézier curve from the current point using a control point and an end point
CGContextAddQuadCurveToPoint(UIGraphicsGetCurrentContext(),
lastContactPoint1.x, lastContactPoint1.y, midPoint2.x, midPoint2.y);
//set the miter limit for the joins of connected lines in a graphics context
CGContextSetMiterLimit(UIGraphicsGetCurrentContext(), 2.0);
//paint a line along the current path
CGContextStrokePath(UIGraphicsGetCurrentContext());
//set the image based on the contents of the current bitmap-based graphics context
mySignatureImage.image = UIGraphicsGetImageFromCurrentImageContext();
//remove the current bitmap-based graphics context from the top of the stack
UIGraphicsEndImageContext();
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
//just clear the image if the user tapped twice on the screen
if ([touch tapCount] == 2) {
mySignatureImage.image = nil;
return;
}
//if the finger never moved draw a point
if(!fingerMoved) {
UIGraphicsBeginImageContext(imageFrame.size);
[mySignatureImage.image drawInRect:CGRectMake(0, 0, imageFrame.size.width, imageFrame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 3.0f);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
mySignatureImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
//calculate midpoint between two points
- (CGPoint) midPoint:(CGPoint )p0 withPoint: (CGPoint) p1 {
return (CGPoint) {
(p0.x + p1.x) / 2.0,
(p0.y + p1.y) / 2.0
};
}
-(void)clickToSave:(id)sender{
//convert image into .png format.
viewNewSign.image = mySignatureImage.image;
if (mySignatureImage.image == nil) {
imgString = #"NoSignature";
}else{
imgString = [self getStringFromImage:mySignatureImage.image];
}
NSLog(#"image saved = %#",imgString);
NSLog(#"image length = %lu",(unsigned long)imgString.length);
viewSign.hidden = TRUE;
scroll.scrollEnabled = YES;
[scroll bringSubviewToFront:viewSign];
}
-(NSString *)getStringFromImage:(UIImage *)image{
if(image){
NSData *dataObj = UIImagePNGRepresentation(image);
//[appDelegate showAlert:#"Data Size" message:[NSString stringWithFormat:#"Data length = %lu",(unsigned long)dataObj.length]];
return [dataObj base64EncodedStringWithOptions:0];
} else {
return #"";
}
}
-(void)clickToClear:(id)sender{
[self digitalSignatureCalled];
}
- (UIImage*)imageWithImage:(UIImage*)image
scaledToSize:(CGSize)newSize;
{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
I am new to iOS and building a paint application.
Everything goes ok..but I am unable to implement NSUndoManager in my application for undo and redo purpose.
The problem is that I am unable to store the previous state of painting for undo.
Here is the code
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
lastPoint = [touch locationInView:self.tempDrawImage];
[[self.undoManage prepareWithInvocationTarget:self]
touchesMoved:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.tempDrawImage];
UIGraphicsBeginImageContext(self.view.frame.size);
[self.tempDrawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width,
self.view.frame.size.height)];
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), brush );
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);
CGContextStrokePath(UIGraphicsGetCurrentContext());
self.tempDrawImage.image = UIGraphicsGetImageFromCurrentImageContext();
[self.tempDrawImage setAlpha:opacity];
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UIGraphicsBeginImageContext(self.tempDrawImage.frame.size);
[self.tempDrawImage.image drawInRect:
CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)
blendMode:kCGBlendModeNormal alpha:1.0];
self.tempDrawImage.image = UIGraphicsGetImageFromCurrentImageContext();
[[self.undoManage prepareWithInvocationTarget:self] touchesMoved:touches
withEvent:event];
UIGraphicsEndImageContext();
}
-(void)undo
{
[self.undoManage undo];
}
-(void)redo
{
[self.undoManage redo];
}
I have searched a lot an answer for this question, but none of them seem to do exactly what I want. A lot of tutorials show me how to add lines and polygons in code, but not with freehand drawing.
I got a MKMapView with a UIImageView over the map. And I can draw a little on my UIImageView but right after that, the MKMapView is draged and the draw doesn't continue.
I would like to know what have I done wrong ?
Here is my code for the touches events :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
pointA = [touch locationInView:drawView];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentLocation = [touch locationInView:drawView];
UIGraphicsBeginImageContext(drawView.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[drawView.image drawInRect:CGRectMake(0, 0, drawView.frame.size.width, drawView.frame.size.height)];
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 5.0);
CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, pointA.x, pointA.y);
CGContextAddLineToPoint(ctx, currentLocation.x, currentLocation.y);
CGContextStrokePath(ctx);
drawView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
pointA = currentLocation;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentLocation = [touch locationInView:drawView];
UIGraphicsBeginImageContext(drawView.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[drawView.image drawInRect:CGRectMake(0, 0, drawView.frame.size.width, drawView.frame.size.height)];
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 5.0);
CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, pointA.x, pointA.y);
CGContextAddLineToPoint(ctx, currentLocation.x, currentLocation.y);
CGContextStrokePath(ctx);
drawView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
pointA = currentLocation;
}
And the code of the button who show the UIImageView :
EDIT : I made this for stoping the interactions with the map :
- (IBAction)modeDraw:(id)sender {
if (drawView.alpha == 0.0) {
drawView.image=nil; //empty for a new draw
drawView.backgroundColor = [UIColor whiteColor];
[UIImageView beginAnimations:nil context:nil];
[UIImageView setAnimationDuration:0.5];
[drawView setAlpha:0.4];
[UIImageView commitAnimations];
myMapView.zoomEnabled = NO;
myMapView.scrollEnabled = NO;
} else {
[UIImageView beginAnimations:nil context:nil];
[UIImageView setAnimationDuration:0.5];
[drawView setAlpha:0.0];
[UIImageView commitAnimations];
myMapView.zoomEnabled = YES;
myMapView.scrollEnabled = YES;
}
}
After doing my draw, I would like to transform this draw into a form (area), that will be put on the map. If you have some indications for me ?
Thank you, and sorry for my bad english.
Here is my code if anyone have the same problem as me and the link that Allan gave me : http://www.apps168.net/post/1460.html :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
pointA = [touch locationInView:drawView];
pathRef = CGPathCreateMutable();
CGPathMoveToPoint(pathRef, NULL, pointA.x, pointA.y);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentLocation = [touch locationInView:drawView];
CGPoint pastLocation = [touch previousLocationInView:drawView];
UIGraphicsBeginImageContext(drawView.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[drawView.image drawInRect:CGRectMake(0, 0, drawView.frame.size.width, drawView.frame.size.height)];
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 5.0);
CGContextSetRGBStrokeColor(ctx, 0.0, 0.0, 0.0, 1.0);
CGContextBeginPath(ctx);
CGContextStrokePath(ctx);
CGContextMoveToPoint(ctx, pastLocation.x, pastLocation.y);
CGContextAddLineToPoint(ctx, currentLocation.x, currentLocation.y);
CGContextDrawPath(ctx, kCGPathFillStroke);
drawView.image=UIGraphicsGetImageFromCurrentImageContext();
CGPathAddLineToPoint(pathRef, NULL, currentLocation.x, currentLocation.y);
UIGraphicsEndImageContext();
//pointA = currentLocation;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
CGPathCloseSubpath(pathRef);
NSUInteger count = [array count];
for (NSUInteger i = 0; i < count; i=i+2) {
NSString *lat = [array objectAtIndex: i];
NSString *lgt = [array objectAtIndex: i+1];
CLLocationCoordinate2D pointLoc;
pointLoc.latitude = [lat doubleValue];
pointLoc.longitude = [lgt doubleValue];
locationConverToImage = [myMapView convertCoordinate:pointLoc toPointToView:drawView];
if (CGPathContainsPoint(pathRef, NULL, locationConverToImage, NO)) {
NSLog(#"point in path!");
//sélection de ces points et cacher les autres.
}
}
[UIImageView beginAnimations:nil context:nil];
[UIImageView setAnimationDuration:0.5];
[drawView setAlpha:0.0];
[UIImageView commitAnimations];
myMapView.zoomEnabled = YES;
myMapView.scrollEnabled = YES;
}
Draw my map try this , this is draw map point project
I am using apps like bamboo book and paper, in iPad, the experience is really good, how is it work? which technology does it used when draw lines or curves on screen?
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
//self.imageView.image = nil;
return;
}
lastPoint = [touch locationInView:self.view];
lastPoint.y -= 20;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y -= 20;
CGFloat components[3];
[self getRGBComponents:components forColor:self.colorView.backgroundColor];
NSLog(#"%f %f %f", components[0], components[1], components[2]);
UIGraphicsBeginImageContext(self.view.frame.size);
[self.imageView.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 10.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), components[0], components[1], components[2],5.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeNormal);
CGContextStrokePath(UIGraphicsGetCurrentContext());
self.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
mouseMoved++;
if (mouseMoved == 10) {
mouseMoved = 0;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
//self.imageView.image = nil;
return;
}
if(!mouseSwiped) {
CGFloat components[3];
[self getRGBComponents:components forColor:self.colorView.backgroundColor];
NSLog(#"%f %f %f", components[0], components[1], components[2]);
UIGraphicsBeginImageContext(self.view.frame.size);
[self.imageView.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), components[0], components[1], components[2], 5.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
self.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
}
Also check following link
http://www.techotopia.com/index.php/An_iOS_4_iPhone_Graphics_Drawing_Tutorial_using_Quartz_2D
https://stackoverflow.com/questions/6449661/drawing-2d-images-on-iphone-tutorials
http://mobile.tutsplus.com/tutorials/iphone/ios-sdk_freehand-drawing/
http://www.raywenderlich.com/18840/how-to-make-a-simple-drawing-app-with-uikit
I working on a drawing app, and I am able to draw with my finger touch, now I am trying to implement, clear ,undo and redo functionality,In my viewcontroller ,I have two IBAction methods for "clearAll" and "Undo", I have created a custom class called drawing.h and .m where I have written functions for handling touch events,below are my functions..
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
tempArray = [[NSMutableArray alloc]init];
if ([touch tapCount] == 2)
{
self.image = nil;
}
return;
}
currentlocation.location = [touch locationInView:self];
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
PointLocation *currentLocation1 = [[PointLocation alloc] init];
currentLocation1.Location = [touch locationInView:self];
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[self.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 2.0);
CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, currentlocation.Location.x, currentlocation.Location.y);
CGContextAddLineToPoint(ctx, currentLocation1.Location.x, currentLocation1.Location.y);
CGContextStrokePath(ctx);
CGContextSetFlatness(ctx, 0.1);
CGContextSetAllowsAntialiasing(ctx, true);
self.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
currentlocation = currentLocation1;
**[tempArray addObject:[NSArray arrayWithObjects:currentlocation,currentLocation1, nil]];
NSLog(#"%i",[tempArray count]);**
}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
PointLocation *currentLocation1 = [[PointLocation alloc] init];
currentLocation1.Location = [touch locationInView:self];
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[self.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 2.0);
CGContextSetRGBStrokeColor(ctx, 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, currentlocation.Location.x, currentlocation.Location.y);
CGContextAddLineToPoint(ctx, currentLocation1.Location.x, currentLocation1.Location.y);
CGContextStrokePath(ctx);
self.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
currentlocation = currentLocation1;
**[tempArray addObject:[NSArray arrayWithObjects:currentlocation,currentLocation1, nil]];
NSLog(#"%i",[tempArray count]);**
}
In the above code I am adding all the CGPoints to an Array,the array is filling with the points, now how shall I perform the undo functionality?
So friends please help me out..
Regards
Ranjit