drawrect

I'm creating a simple app where when the user presses a button, a series of lines will be drawn on the screen and the user will be able to see these lines drawn in real time (almost like an animation). My code looks something like this (has been simplified): UIGraphicsBeginImageContext(CGSizeMake(300,300)); CGContextRef context = UIGraphicsGetCurrentContext(); for (int i = 0; i < 100; i++ ) { CGContextMoveToPoint(context, i, i); CGContextAddLineToPoint(context, i+20, i+20); CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextStrokePath(context); } UIImage

following my another question , I have provided the code that draws the rectangle as follows: void COpenGLControl::DrawRectangleOnTopOfTexture() { wglMakeCurrent(hdc, hrc); glPushAttrib(GL_ENABLE_BIT|GL_CURRENT_BIT); glDisable(target); glColor3f(1.0f,0.0f,0.0f); glBegin(GL_LINE_LOOP); glVertex2f(RectangleToDraw.at(0),RectangleToDraw.at(1)); glVertex2f(RectangleToDraw.at(0),RectangleToDraw.at(3)); glVertex2f(RectangleToDraw.at(2),RectangleToDraw.at(3)); glVertex2f(RectangleToDraw.at(2),RectangleToDraw.at(1)); glEnd(); glPopAttrib(); SwapBuffers(hdc); wglMakeCurrent(NULL, NULL); } void

I have a UIViewController class called AppController.h , AppController.m . I have thousands of lines of code in there, and that is the only reason why I didn't test this before I asked it. Is there any possible way to use drawRect in a UIViewController ? that way I wouldn't have to make more delegates and methods and callbacks. I should have started off using drawRect to handle my drawing code, but I didn't, and there's severe lag with core graphics on the iPad. So, please let me know if there's any way to use drawRect in a UIViewController . Thanks! A view controller naturally has a pointer

Seem to be having a bit of an issue trying to draw my view into a context. My basic setup is, I have a view controller that owns a UIPageViewController in which I load controllers with views that can be drawn on by the users finger. Basically I have a book that can be drawn in. When the page is turned in the book I save the image by calling - (UIImage *)wholeImage { // Render the layer into an image and return UIGraphicsBeginImageContext(self.bounds.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *wholePageImage = UIGraphicsGetImageFromCurrentImageContext();

I'd like to change the appearance of the default UISearchBar. As an example, how would you recreate the search box in the Google iPhone app as seen below? How would you overlay an image to produce this effect? (source: isedb.com ) Upon some investigating of possibilites to customize the search bar, I'm inclined to say this is a custom component that has nothing to do with UISearchBar , but instead recreates its functionality. You don't need to subclass anything. Create a new UIView that has the buttons and text field and then when then entire view is going to load do this: [self

I'm doing a GPS tracking app. Every time it receives a Latitude/Longitude it converts it to (x,y) coordinates and calls drawRect to draw a line between two (x,y) pairs. However, the drawRect method just clear all the old contents before it draw new thing. How I can make the drawRect to draw new thing on the existing canvas? Thanks in advance here is my viewController.h #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h> @class routetrack; @interface simpleDrawViewController : UIViewController <CLLocationManagerDelegate> { CLLocationManager *locationManager; IBOutlet routetrack

I have a view which implements freehand drawing, but I have a small problem. I noticed on the iPad 3 that everything went to hell, so I tried to update my drawing code (probably as I should have done in the first place) to only update the portion that was stroked. However, the first stroke after open, and the first stroke after about 10 seconds of idle are extremely slow. After everything is "warmed up" it is smooth as butter and only takes about 0.15ms per drawRect. I don't know why, but the whole view rectangle is getting marked as dirty for the first drawRect, and the first drawRect after