I wrote:
#define IS_IPHONE_5 ([UIScreen mainScreen].bounds.size.height == 568.0)
#ifdef IS_IPHONE_5
#define SCREEN_HEIGHT 568
#else
#define SCREEN_HEIGHT 480
#endif
but it always return that device is iPhone 5... What am I doing wrong?
Your IS_IPHONE_5 macro is just fine. You can do things like this:
if (IS_IPHONE_5) {
// do something specific for iPhone 5
}
At compile time this code will be converted to:
if (([UIScreen mainScreen].bounds.size.height == 568.0)) {
}
The problem is your SCREEN_HEIGHT macros. The whole #ifdef block will be evaluated at compile time. Since you did define IS_IPHONE_5, the SCREEN_HEIGHT will always be set to 568.
You want a runtime determination of the screen height. You can get this from:
[UIScreen mainScreen].bounds.size.height
The screen height check must be done at run-time. #ifdef IS_IPHONE_5 will not be evaluated at run-time, but pre-compile time. You could call your screen height code as part of a run-time method on a class.
you could just do something like
- (BOOL) isIphone5
{
return ([UIScreen mainScreen].bounds.size.height == 568.0);
}
or as maddy suggests below
Any directive beginning with # is dealt with by the pre-processor; so prior to the application even being compiled.
Now you are requiring run-time code to be executed in your definition; specifically - [UIScreen mainScreen].bounds.size.height. Obviously this isn't going to be executed when the app isn't even compiled yet!
In most desktop applications where the #ifdef directive is used, it's because it's evaluated by the preprocessor at compile time from #define statements that are usually located in source files on the host machine. (That is, I will be compiling code for Mac OS X on a Mac OS X machine, therefore the preprocessor will find #define statements elsewhere to allow it recognise it's platform)
For what you're looking at doing you're going to have to detect the screensize when the app is actually running on a device; not prior to compile time - as after it is compiled it could be ran on any device.
The bottom line is preprocessor conditional statements are only conditional at compile time - they can not change the execution once an app has been compiled; they become 'static' just like any other code you're compiling.
Try this define
#define IS_IPHONE_5 ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )
Related
I'm in UE4 4.21.2
I'm a total noob for UE4. I'm following along with a tutorial where I need to use the GetPlayerViewPoint method on the PlayerController class, however when I try and call that method, I get a compile time error that says: class "APlayerController" has no member "GetPlayerViewPoint"
Which is weird because I get autocomplete in Visual Studio for other methods on that class, but not that particular method, BUT I can see that method in the docs here:
http://api.unrealengine.com/INT/API/Runtime/Engine/GameFramework/APlayerController/index.html
Could it be that my compiler and autocomplete are using a different UE4 version than the docs and tutorial?
Anyways, here is my class.
// Copyright, 2018
#include "BryceEscapeRoomUe4.h"
#include "Grabber.h"
#include "Runtime/Engine/Classes/GameFramework/Actor.h"
#include "Engine/World.h";
#include "GameFramework/PlayerController.h"
#define OUT
// Sets default values for this component's properties
UGrabber::UGrabber()
{
// Set this component to be initialized when the game starts, and to be ticked every frame. You can turn these features
// off to improve performance if you don't need them.
PrimaryComponentTick.bCanEverTick = true;
// ...
}
// Called when the game starts
void UGrabber::BeginPlay()
{
Super::BeginPlay();
UE_LOG(LogTemp, Warning, TEXT("Grabber repoting for duty!"));
}
// Called every frame
void UGrabber::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
// get player view point this tick
FVector PlayerVeiwPointLocation;
FRotator PlayerVeiwPointRotaion;
GetWorld()->GetFirstPlayerController()->GetPlayerVeiwPoint(
OUT PlayerVeiwPointLocation,
OUT PlayerVeiwPointRotaion
);
//log out to test
//ray cast out to reach distance
// see what we hit
}
I think this may have been caused by the fact that you have spelled GetPlayerViewPoint as GetPlayerVeiwPoint, which isn't a method that exists in UE4. Hopefully that should fix the problem, although as this is a relatively old question I'm sure you figured that out a while ago!
I have installed latest facebook sdk 3.8.Now when I am trying to run the sample app in Xcode 5 DP,deploymnent target is iOS7.Unfortunately I keep getting
Use of undeclared identifier 'UIEdgeRectNone'
How can I solve this issue?
Below is the code snippet where compiler is throwing error:
#ifdef __IPHONE_7_0
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0
if ([self.rootViewController respondsToSelector:#selector(setEdgesForExtendedLayout:)])
{
self.rootViewController.edgesForExtendedLayout &= ~UIRectEdgeNone;
}
#endif
#endif
#endif
I am trying to make Open CV project sample for Template Matching as explained here .
Steps i did so far includes :
Downloaded and imported Open CV framework in my project changed the .m extension files to .mm and in the .pch file i have included the code
#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#endif
#ifdef __OBJC__
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#endif
I have also downloaded and imported the MatchTemplate_Demo.cpp file from the link.
But here having library linking issue
ld: warning: directory not found for option '-L/Users/G1/Desktop/Xcode'
ld: warning: directory not found for option '-Lprojects/FirstOpenCv/opencv/lib/debug'
ld: library not found for -lopencv_calib3d
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I followed the same step to include the library as given here.
2) Add $(SRCROOT)/opencv to header search path and $(SRCROOT)/opencv/lib/debug for library search path for debug configuration and $(SRCROOT)/opencv/lib/release for release build.
3) Add OpenCV libs to linker input by modifying "Other Linker Flags" option with "-lopencv_calib3d -lzlib -lopencv_contrib -lopencv_legacy -lopencv_features2d -lopencv_imgproc -lopencv_video -lopencv_core".
Now can please any one tell me how should i make the project run.
I have taken the source and template image and imported in the project.
I have basically ViewController.h and ViewController.mm file now i don't know what should i code in these files to see the result.
Also Step 2 :
I need to scan the image in real time using camera view (so that when i place my camera over the source image it should scan and find the template).
On following this link i got Linker error while importing the .cpp file :
ld: 1 duplicate symbol for architecture i386 clang:
error: linker command failed with exit code 1 (use -v to see invocation)
Please can any one suggest me how should i implement it.
You have three interrelated questions here:
1/ how to get openCV framework to run in an iOS project
2/ how to get the Template Matching c++ sample code to run in an iOS project
3/ how to do live template matching with the camera view
1/ how to get openCV framework to run in an iOS project
Download and import the openCV framework as you describe
Change the .pch file as you describe
check that c++ standard library is set to libc++ in your target build settings (this is the default for new projects)
Don't just import demo.cpp without making changes as described below (it is a 'raw' c++ progam with it's own main function, and needs alterations to work as part of an iOS/Cocoa project).
Don't mess with header search paths, other linker flags etc, this isn't necessary if you have imported the prebuilt framework from openCV.org.
Don't change your .m files to .mm unless you know that you need to. My advice is to keep your c++ code separate from your objective-C code as far as practicable, so most of you files should be .m files (objective-C) or .cpp files (c++). You only need .mm prefixes for "objective-C++" where you intend to mix objective-C and c++ in the same file.
2/ how to get the Template Matching c++ sample code to run in an iOS project
We are going to set this up so that your iOS viewController - and the bulk of your iOS code - does not need to know that the image is processed using openCV/C++, and likewise the C++ code doesn't need to know where it's input or output image data is being routed to. We do this by making a small wrapper class between the two that translates objective-C method calls to c++ class member functions and back. We will also set up a category on UIImage to translate image formats from iOS-friendly UIImage to openCV-native cv::Mat.
UIImage+OpenCV Category
You need some utility methods to convert from UIImage to cv::Mat and back. A good place to put these is in a UIImage category. In XCode: File>New FIle>Cocoa Touch>Objective-C category will set you up. Call the category OpenCV and make it a category on UIImage. This .m file you will want to change to .mm as it will need to understand c++ types from the openCV framework.
The header should look something like this:
#import <UIKit/UIKit.h>
#interface UIImage (OpenCV)
//cv::Mat to UIImage
+ (UIImage *)imageWithCVMat:(const cv::Mat&)cvMat;
//UIImage to cv::Mat
- (cv::Mat)cvMat;
#end
The .mm file should implement these methods by closely following this openCV.org code sample adapted to work as category methods (eg you don't pass a UIImage into the instance method, but refer to it using self).
You can use the category methods as if they are UIImage class and instance methods like this:
UIImage* image = [UIImage imageWithCVMat:matImage]; //class method
cv::Mat matImage = [image cvMat]; //instance method
openCV wrapper class
Make a wrapper class to convert your objective-C method (called from a viewController) to a c++ function
header something like this
// CVWrapper.h
#import <Foundation/Foundation.h>
#interface CVWrapper : NSObject
+ (NSImage*) templateMatchImage:(UIImage*)image
patch:(UIImage*)patch
method:(int)method;
#end
We send in the template image, patch image and template matching method, and get back an image showing the match
implementation (.mm file)
// CVWrapper.mm
#import "CVWrapper.h"
#import "CVTemplateMatch.h"
#import "UIImage+OpenCV.h"
#implementation CVWrapper
+ (UIImage*) templateMatchImage:(UIImage *)image
patch:(UIImage *)patch
method:(int)method
{
cv::Mat imageMat = [image cvMat];
cv::Mat patchMat = [patch cvMat];
cv::Mat matchImage =
CVTemplateMatch::matchImage(imageMat,
patchMat,
method);
UIImage* result = [UIImage imageWithCVMat:matchImage];
return result;
}
We are effectively taking a standard objective-C method and UIImage types and translating them into a call to a C++ member function with c++(openCV framework) types, and translating the result back to a UIImage.
C++ TemplateMatch class
Header:
// TemplateMatch.h
#ifndef __CVOpenTemplate__CVTemplateMatch__
#define __CVOpenTemplate__CVTemplateMatch__
class CVTemplateMatch
{
public:
static cv::Mat matchImage (cv::Mat imageMat,
cv::Mat patchMat,
int method);
};
#endif /* defined(__CVOpenTemplate__CVTemplateMatch__) */
#end
Implementation:
This is the Template Match openCV example code, reworked as a class implementation:
// TemplateMatch.cpp
/*
Alterations for use in iOS project
[1] remove GUI code (iOS supplies the GUI)
[2] change main{} to static member function
with appropriate inputs and return value
[3] change MatchingMethod{} signature
to return Mat value
*/
#include "CVTemplateMatch.h"
//[1] #include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
using namespace std;
using namespace cv;
/// Global Variables
Mat img; Mat templ; Mat result;
//[1] char* image_window = "Source Image";
//[1] char* result_window = "Result window";
int match_method;
//[1] int max_Trackbar = 5;
/// Function Headers
Mat MatchingMethod( int, void* ); //[3] (added return value to function)
// [2] /** #function main */
// [2] int main( int argc, char** argv )
Mat CVTemplateMatch::matchImage (Mat image,Mat patch, int method)
// [2]
{
/// Load image and template
//[2] img = imread( argv[1], 1 );
//[2] templ = imread( argv[2], 1 );
img = image; //[2]
templ = patch; //[2]
match_method = method; //[2]
/// Create windows
//[1] namedWindow( image_window, CV_WINDOW_AUTOSIZE );
//[1] namedWindow( result_window, CV_WINDOW_AUTOSIZE );
/// Create Trackbar
//[1] char* trackbar_label = "Method: \n 0: SQDIFF \n 1: SQDIFF NORMED \n 2: TM CCORR \n 3: TM CCORR NORMED \n 4: TM COEFF \n 5: TM COEFF NORMED";
//[1] createTrackbar( trackbar_label, image_window, &match_method, max_Trackbar, MatchingMethod );
Mat result = MatchingMethod( 0, 0 );
//[1] waitKey(0);
//[2] return 0;
return result; //[2]
}
//[3] void MatchingMethod( int, void* )
Mat MatchingMethod( int, void* )
{
/// Source image to display
Mat img_display;
img.copyTo( img_display );
/// Create the result matrix
int result_cols = img.cols - templ.cols + 1;
int result_rows = img.rows - templ.rows + 1;
result.create( result_cols, result_rows, CV_32FC1 );
/// Do the Matching and Normalize
matchTemplate( img, templ, result, match_method );
normalize( result, result, 0, 1, NORM_MINMAX, -1, Mat() );
/// Localizing the best match with minMaxLoc
double minVal; double maxVal; Point minLoc; Point maxLoc;
Point matchLoc;
minMaxLoc( result, &minVal, &maxVal, &minLoc, &maxLoc, Mat() );
/// For SQDIFF and SQDIFF_NORMED, the best matches are lower values. For all the other methods, the higher the better
if( match_method == CV_TM_SQDIFF || match_method == CV_TM_SQDIFF_NORMED )
{ matchLoc = minLoc; }
else
{ matchLoc = maxLoc; }
/// Show me what you got
rectangle( img_display, matchLoc, Point( matchLoc.x + templ.cols , matchLoc.y + templ.rows ), Scalar::all(0), 2, 8, 0 );
rectangle( result, matchLoc, Point( matchLoc.x + templ.cols , matchLoc.y + templ.rows ), Scalar::all(0), 2, 8, 0 );
//[1] imshow( image_window, img_display );
//[1] imshow( result_window, result );
return img_display; //[3] add return value
}
Now in your viewController you just need to call this method:
UIImage* matchedImage =
[CVWrapper templateMatchImage:self.imageView.image
patch:self.patchView.image
method:0];
with no c++ in sight.
3/ Template Matching with live camera view
The short answer: matchTemplate is not going to work too well in a live camera context. The algorithm is looking for a match in the image with the same scale and orientation as the patch: it slides the patch tile across the image at it's original orientation and size comparing for best match. This is not going to yield great results if the image is perspective-skewed, a different size or rotated to a different orientation.
You could look instead at OpenCV's Feature Detection algorithms, some of which have been moved to non-free. Here is a nice description of SIFT to give you the idea. For video capture you might also want to look at cap_ios.h in opencv2/highgui: here is a tutorial.
Actually you have downloaded already compiled library so no need to follow the steps that you have mentioned in your question and this the issues(i.e. you have followed incorrect steps) because that steps are to compile the source code into static library.
Follow the below steps and it will be done
Unzip the downloaded framework. You can see folder with name "opencv2.framework"
Drag that folder directly into project(Note. When you drag that folder into xcode, xcode will prompt you dialog there will be a tick mark to actually copy this into folder. please tick that check box)
In you .pch file import openCV like you have mentioned in your question is correct way
Now compile. One thing more wherever you want to use function of openCV that file should have .mm extension(i.e. Objective C++ source) It will run perfectly.
Help link:
I'm using Eclipse and CDT to work with the mspgcc compiler, it compiles fine, but the code view highlights all my special function registers as unresolved.
I've made a C project where the compiler is "msp430-gcc -mmcu=msp430x2012", and that's set to look for includes in /usr/msp430/include/. I've set the linker to "msp430-gcc -mmcu=msp430x2012", and that's set to look fo libraries in /usr/msp430/lib/. I've set the assembler to "msp430-as". I've told eclipse it's making an elf and I've disabled automatic includes discovery to not find the i686 libraries on my linux box (stupid eclipse!).
Here's the code:
#include <msp430.h>
#include <signal.h> //for interrupts
#define RED 1
#define GREEN 64
#define S2VAL 8
void init(void);
int main(void) {
init(); //Setup Device
P1OUT = GREEN; //start with a green LED
_BIS_SR(LPM4_bits); //Go into Low power mode 4, main stops here
return(1); //never reached, surpresses compiler warning
}
interrupt (PORT1_VECTOR) S1ServiceRoutine(void) {
//we wake the MCU here
if (RED & P1IN) {
P1OUT = GREEN;
} else {
P1OUT = RED;
}
P1IFG = 0; //clear the interrupt flag or we immidiately go again
//we resume LPM4 here thanks to the RETI instruction
}
void init(void) {
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
/*Halt the watchdog timer
P1DIR = ~S2VAL; //Set LED pins as outputs and S2 as input
P1IES = S2VAL; //interrupt on High to Low
P1IE = S2VAL; //enable interrupt for S1 only
WRITE_SR(GIE); //enable maskable interrupts
}
All the variables defines in the mspgcc includes such as P1OUT and WDTCTL show up in the problems box as "not resolved", but remember it builds just fine. I've even tried explicitly including the header file for my chip (normally msp430-gcc does this via msp430.h and the -mmcu option).
I resolved this issue by explicitly including the msp430g2553.h file
#include <msp430g2553.h>
I resolved the issue by following the instructions here
I've been trying to set a background image on a gtk widget without success, even after trying 4 different approaches.
The following program contains 3 approaches (the 4th approach involves no code). I compiled it using MinGW (g++ 4.5.0) and gtkmm 2.4. The APPROACH macro can be set to 1, 2 or 3 in order to choose which approach to compile. I've also added references in the comments, so you can find out where I got the ideas from.
#include <iostream>
#include <gtkmm/main.h>
#include <gtkmm/alignment.h>
#include <gtkmm/box.h>
#include <gtkmm/entry.h>
#include <gtkmm/eventbox.h>
#include <gtkmm/frame.h>
#include <gtkmm/image.h>
#include <gtkmm/label.h>
#include <gtkmm/table.h>
#include <gtkmm/window.h>
// Set this to 1, 2 or 3 to try different ways of drawing the background
// Set to 0 to load no background at all
#define APPROACH (0)
// Making this alignment global in order to modify it from drawBackground
Gtk::Alignment* alignment;
bool drawBackground(GdkEventExpose* event) {
std::cout << "Draw background" << std::endl;
// Load background image
Glib::RefPtr<Gdk::Pixbuf> pixbuf = Gdk::Pixbuf::create_from_file("background.jpg");
Glib::RefPtr<Gdk::Pixmap> pixmap;
Glib::RefPtr<Gdk::Bitmap> mask;
pixbuf->render_pixmap_and_mask(pixmap, mask,0);
{
// Test that pixbuf was created correctly
Glib::RefPtr<Gdk::Pixbuf> back_to_pixbuf = Gdk::Pixbuf::create((Glib::RefPtr<Gdk::Drawable>)pixmap, 0, 0, pixbuf->get_width(), pixbuf->get_height());
back_to_pixbuf->save("back_to_pixbuf.png", "png");
}
#if APPROACH == 1
// Approach 1: draw_pixbuf
// Ref: http://islascruz.org/html/index.php/blog/show/Image-as-background-in-a-Gtk-Application..html
Glib::RefPtr<Gtk::Style> style = alignment->get_style();
alignment->get_window()->draw_pixbuf(style->get_bg_gc(Gtk::STATE_NORMAL), pixbuf, 0, 0, 0, 200, pixbuf->get_width(), pixbuf->get_height(), Gdk::RGB_DITHER_NONE, 0, 0);
#endif
#if APPROACH == 2
// Approach 2: set_back_pixmap
// Ref: http://www.gtkforums.com/viewtopic.php?t=446
// http://stackoverflow.com/questions/3150706/gtk-drawing-set-background-image
alignment->get_window()->set_back_pixmap(pixmap);
#endif
}
int main (int argc, char *argv[])
{
Gtk::Main kit(argc, argv);
Gtk::Window w;
Gtk::VBox mainBox;
// Top image
Gtk::Image topImage("header.jpg");
mainBox.pack_start(topImage,false,false,0);
// Middle alignment
alignment = Gtk::manage(new Gtk::Alignment);
mainBox.pack_start(*alignment,true,true,0);
// Create widget
Gtk::Alignment mywidget(0.5, 0.5, 0.1, 0.9);
Gtk::Table table;
Gtk::Label label1("Username"); table.attach(label1,0,1,0,1);
Gtk::Label label2("Password"); table.attach(label2,0,1,1,2);
Gtk::Entry entry1; table.attach(entry1,1,2,0,1);
Gtk::Entry entry2; table.attach(entry2,1,2,1,2);
Gtk::Button button("Login"); table.attach(button,1,2,2,3);
mywidget.add(table);
// Put widget in middle alignment
alignment->add(mywidget);
// Try to change the background
#if APPROACH == 1 || APPROACH == 2
alignment->signal_expose_event().connect(sigc::ptr_fun(&drawBackground), true);
#endif
#if APPROACH == 3
// Approach 3: modify the style using code
// Ref: http://www.gtkforums.com/viewtopic.php?t=446
// Load background image
Glib::RefPtr<Gdk::Pixbuf> pixbuf = Gdk::Pixbuf::create_from_file("background.jpg");
Glib::RefPtr<Gdk::Pixmap> pixmap;
Glib::RefPtr<Gdk::Bitmap> mask;
pixbuf->render_pixmap_and_mask(pixmap, mask,0);
Glib::RefPtr<Gtk::Style> style = alignment->get_style()->copy();
style->set_bg_pixmap(Gtk::STATE_NORMAL,pixmap);
style->set_bg_pixmap(Gtk::STATE_ACTIVE,pixmap);
style->set_bg_pixmap(Gtk::STATE_PRELIGHT,pixmap);
style->set_bg_pixmap(Gtk::STATE_SELECTED,pixmap);
style->set_bg_pixmap(Gtk::STATE_INSENSITIVE,pixmap);
alignment->set_style(style);
#endif
// Approach 4: modify share\themes\MS-Windows\gtk-2.0
// adding the following line
// bg_pixmap[NORMAL] = "D:\\path\\to\\file\\background.jpg"
// in the style "msw-default" section
// Ref: http://lists.ximian.com/pipermail/gtk-sharp-list/2005-August/006324.html
// Show the window
w.add(mainBox);
w.show_all();
kit.run(w);
return 0;
}
Links to images I used: header.jpg background.jpg
The layout mimics that of my actual program. The main window contains a Gtk::VBox with a header image on top and an Gtk::Alignment at the bottom. The contents of this alignment will change over time but I want it to have a background image always visible.
When loading no background at all, the header image loads correctly and the window looks like this:
Approach 1 is the one that is closer to work, though it hides the labels and the buttons:
Approaches 2 and 3 look the same as loading no background. Besides, approach 2 gives me the following error message:
(test-img-fondo.exe:1752): Gdk-CRITICAL **: gdk_window_set_back_pixmap: assertion `pixmap == NULL || !parent_relative' failed
Finally, in approach 4, I attempt to modify share\themes\MS-Windows\gtk-2.0 by adding the following line
bg_pixmap[NORMAL] = "D:\\path\\to\\file\\background.jpg"
in the style "msw-default" section. It doesn't work either.
So, has anyone succesfully drawn a background image on a Gtk widget? Is this possible at all? Any changes in my code that would make this work? Any workarounds?
All help is greatly appreciated.
I think I've solved it myself. Use approach 1 but change this line
alignment->signal_expose_event().connect(sigc::ptr_fun(&drawBackground), true);
for this:
alignment->signal_expose_event().connect(sigc::ptr_fun(&drawBackground), false);
This way, the call to drawBackground occurs before gtk calls its own handlers.
I should also point out that, in a real program, the images should be loaded once outside of drawBackground.