#import "MainScene.h"
static const CGFloat _scrollSpeed = 80.f;
#implementation MainScene {
CCSprite *_hero;
CCPhysicsNode *_physicsNode;
CCNode *_ground1;
CCNode *_ground2;
NSArray *_grounds;
}
- (void)didLoadFromCCB {
_grounds = #[_ground1, _ground2];
}
- (void)update:(CCTime)delta {
_hero.position = ccp(_hero.position.x + delta * _scrollSpeed, _hero.position.y);
_physicsNode.position = ccp(_physicsNode.position.x - (_scrollSpeed *delta), _physicsNode.position.y);
// loop the ground
for (CCNode *ground in _grounds) {
// get the world position of the ground
CGPoint groundWorldPosition = [_physicsNode convertToWorldSpace:ground.position];
// get the screen position of the ground
CGPoint groundScreenPosition = [self convertToNodeSpace:groundWorldPosition];
// if the left corner is one complete width off the screen, move it to the right
if (groundScreenPosition.x <= (-1 * ground.contentSize.width)) {
ground.position = ccp(ground.position.x + 2 * ground.contentSize.width, ground.position.y);
}
}
}
#end
And in this line
if (groundScreenPosition.x <= (-1 * ground.contentSize.width)) {
I have this 2 issues
Expected expression
Use of undeclared identifier 'lt'
thats my problem
plis help me, I really need it before possible
Wherever you copied your code from, it percent-escaped a less than sign, so it put in < instead of <. So just replace the < with <.
Related
I need some help understanding why a bug is happening in some code using a GtkTreeView, and how to fix it.
In the program, the user opens an image and runs a function to detect stars in the image. This is all reliable and works fine. Data about each star is populated into a GtkTreeView.
The user then clicks on a star in the display which triggers a callback:
gboolean on_drawingarea_button_release_event(GtkWidget *widget, GdkEventButton *event, gpointer user_data)
that in turn calls the function shown below:
void set_iter_of_clicked_psf(double x, double y) {
GtkTreeSelection *selection = GTK_TREE_SELECTION(gtk_builder_get_object(gui.builder, "treeview-selection"));
GtkTreeView *treeview = GTK_TREE_VIEW(lookup_widget("Stars_stored"));
GtkTreeModel *model = gtk_tree_view_get_model(treeview);
GtkTreeIter iter;
gboolean valid;
gboolean is_as;
const double radian_conversion = ((3600.0 * 180.0) / M_PI) / 1.0E3;
double invpixscalex = 1.0;
double bin_X = gfit.unbinned ? (double) gfit.binning_x : 1.0;
if (com.stars && com.stars[0]) {// If the first star has units of arcsec, all should have
is_as = (strcmp(com.stars[0]->units,"px"));
} else {
return; // If com.stars is empty there is no point carrying on
}
if (is_as) {
invpixscalex = 1.0 / (radian_conversion * (double) gfit.pixel_size_x / gfit.focal_length) * bin_X;
}
valid = gtk_tree_model_get_iter_first(model, &iter);
while (valid) {
gdouble xpos, ypos, fwhmx;
gtk_tree_model_get(model, &iter, COLUMN_X0, &xpos, -1);
gtk_tree_model_get(model, &iter, COLUMN_Y0, &ypos, -1);
gtk_tree_model_get(model, &iter, COLUMN_FWHMX, &fwhmx, -1);
fwhmx *= invpixscalex;
gdouble distsq = (xpos - x) * (xpos - x) + (ypos - y) * (ypos - y);
gdouble psflimsq = 6. * fwhmx * fwhmx;
if (distsq < psflimsq) {
GtkTreePath *path = gtk_tree_model_get_path(model, &iter);
if (!path) return;
gtk_tree_selection_select_path(selection, path);
gtk_tree_view_scroll_to_cell(treeview, path, NULL, TRUE, 0.5, 0.0);
gtk_tree_path_free(path);
gui.selected_star = get_index_of_selected_star(xpos, ypos);
display_status();
redraw(REDRAW_OVERLAY);
return;
}
valid = gtk_tree_model_iter_next(model, &iter);
}
siril_debug_print("Point clicked does not correspond to a known star\n");
return;
}
The code steps through each iter in the GtkTreeView and checks whether the location clicked is close enough to the centre of a star: the key bit of the code then follows inside the conditional towards the end of the function. If the location matches a star, a GtkTreePath is declared and initialised based on the iter, changes the selection to that path and calls gtk_tree_view_scroll_to_cell() which is supposed to scroll the GtkTreeView so that the selected star is shown.
For some users the code works every time and causes the tree view to scroll to the selected star. For other users sometimes it works, sometimes it does not work. When it doesn't work I can tell the correct code path is followed because gui.selected_star is updated correctly (it triggers a drawing event in the subsequent redraw(REDRAW_OVERLAY) call. It is only gtk_tree_view_scroll_to_cell() that appears to function erractically.
Neither I nor one of my fellow developers can see why it works sometimes but not always, nor can we see why some users don't see the bug at all. So if any GTK gurus could enlighten me I'd be most grateful!
is there a way to apply skphysics to a animated character? Okay I have my player play an animation when I move it around the screen and below is it's animation code but for some reason when I want to apply physics to my animation, I get an error saying wrong data type.
Sending 'SKSpriteNode *_strong' to parameter of incompatible type 'CGRect' (aka 'struct CGRect')
NO Reputation and I can't answer my own question so I posted here.
actually never mind I had to add this _Player.frame and I am hoping this is right and is putting physics on my character. However, please correct me if I am wrong. thanks.
- (void) Player {
_Player = [SKSpriteNode spriteNodeWithImageNamed:#"bird"];
_Player.xScale = 0.88;
_Player.yScale = 0.88;
_Player.position = CGPointMake(100, 100);
[self addChild:_Player];
// 1
NSMutableArray *PlayerCh = [NSMutableArray arrayWithCapacity:2];
// 2
for (int i = 1; i < 2; i++) {
NSString *mytextureName = [NSString stringWithFormat:#"bird%d", i];
SKTexture *ItsTexture = [SKTexture textureWithImageNamed:mytextureName];
[PlayerCh addObject:ItsTexture];
}
// 3
for (int i = 2; i > 1; i--) {
NSString *mytextureName = [NSString stringWithFormat:#"bird%d", i];
SKTexture *ItsTexture = [SKTexture textureWithImageNamed:mytextureName];
[PlayerCh addObject:ItsTexture];
}
// 4
_PlayerAnimation = [SKAction animateWithTextures:PlayerCh timePerFrame:0.1];
// SKPHYSICS FOR PLAYER
SKPhysicsBody *MYPLAYER = [SKPhysicsBody bodyWithCircleOfRadius:_Player]; // I get a error here.
}
Of course this program has to crash when it runs
[SKPhysicsBody bodyWithCircleOfRadius:_Player] expects a float not an SKPriteNode, what you probably want to do is change this line of code to the following:
SKPhysicsBody *MYPLAYER = [SKPhysicsBody bodyWithCircleOfRadius:_Player.size.width/2];
I'm trying to create a text field similar to Finder's file labels. I would like the last (second) line to be truncated in the middle.
I started with a multi-line NSTextField.
However, calling [self.cell setLineBreakMode:NSLineBreakByTruncatingMiddle]; results in a the text field showing only a single truncated line (no line breaks anymore).
Here is what it looks like in Finder:
If you want to wrap text like finder labels, using two labels doesn't do you any good since you need to know what the maximum breakable amount of text is on the first line. Plus, if you're building something that will display a lot of items two labels will overburden the GUI needlessly.
Set your NSTextField.cell like this:
[captionLabel.cell setLineBreakMode: NSLineBreakByCharWrapping];
Then find the code for "NS(Attributed)String+Geometrics" (Google it, it's out there). You must #import "NS(Attributed)String+Geometrics.h"
to measure text. It monkey patches NSString and NSAttributedString
I include the following code to wrap text exactly how Finder does in its captions. Using one label below the icon it assumes that, like Finder, there will be two lines of caption.
First this is how you will call the following code in your code:
NSString *caption = self.textInput.stringValue;
CGFloat w = self.captionLabel.bounds.size.width;
NSString *wrappedCaption = [self wrappedCaptionText:self.captionLabel.font caption:caption width:w];
self.captionLabel.stringValue = wrappedCaption ? [self middleTruncatedCaption:wrappedCaption withFont:self.captionLabel.font width:w] : caption;
Now for the main code:
#define SINGLE_LINE_HEIGHT 21
/*
This is the way finder captions work -
1) see if the string needs wrapping at all
2) if so find the maximum amount that will fit on the first line of the caption
3) See if there is a (word)break character somewhere between the maximum that would fit on the first line and the begining of the string
4) If there is a break character (working backwards) on the first line- insert a line break then return a string so that the truncation function can trunc the second line
*/
-(NSString *) wrappedCaptionText:(NSFont*) aFont caption:(NSString*)caption width:(CGFloat)captionWidth
{
NSString *wrappedCaption = nil;
//get the width for the text as if it was in a single line
CGFloat widthOfText = [caption widthForHeight:SINGLE_LINE_HEIGHT font:aFont];
//1) nothing to wrap
if ( widthOfText <= captionWidth )
return nil;
//2) find the maximum amount that fits on the first line
NSRange firstLineRange = [self getMaximumLengthOfFirstLineWithFont:aFont caption:caption width:captionWidth];
//3) find the first breakable character on the first line looking backwards
NSCharacterSet *notAlphaNums = [NSCharacterSet alphanumericCharacterSet].invertedSet;
NSCharacterSet *whites = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSRange range = [caption rangeOfCharacterFromSet:notAlphaNums options:NSBackwardsSearch range:firstLineRange];
NSUInteger splitPos;
if ( (range.length == 0) || (range.location < firstLineRange.length * 2 / 3) ) {
// no break found or break is too (less than two thirds) far to the start of the text
splitPos = firstLineRange.length;
} else {
splitPos = range.location+range.length;
}
//4) put a line break at the logical end of the first line
wrappedCaption = [NSString stringWithFormat:#"%#\n%#",
[[caption substringToIndex:splitPos] stringByTrimmingCharactersInSet:whites],
[[caption substringFromIndex:splitPos] stringByTrimmingCharactersInSet:whites]];
return wrappedCaption;
}
/*
Binary search is great..but when we split the caption in half, we dont have far to go usually
Depends on the average length of text you are trying to wrap filenames are not usually that long
compared to the captions that hold them...
*/
-(NSRange) getMaximumLengthOfFirstLineWithFont:(NSFont *)aFont caption:(NSString*)caption width:(CGFloat)captionWidth
{
BOOL fits = NO;
NSString *firstLine = nil;
NSRange range;
range.length = caption.length /2;
range.location = 0;
NSUInteger lastFailedLength = caption.length;
NSUInteger lastSuccessLength = 0;
int testCount = 0;
NSUInteger initialLength = range.length;
NSUInteger actualDistance = 0;
while (!fits) {
firstLine = [caption substringWithRange:range];
fits = [firstLine widthForHeight:SINGLE_LINE_HEIGHT font:aFont] < captionWidth;
testCount++;
if ( !fits ) {
lastFailedLength = range.length;
range.length-= (lastFailedLength - lastSuccessLength) == 1? 1 : (lastFailedLength - lastSuccessLength)/2;
continue;
} else {
if ( range.length == lastFailedLength -1 ) {
actualDistance = range.length - initialLength;
#ifdef DEBUG
NSLog(#"# of tests:%d actualDistance:%lu iteration better? %#", testCount, (unsigned long)actualDistance, testCount > actualDistance ? #"YES" :#"NO");
#endif
break;
} else {
lastSuccessLength = range.length;
range.length += (lastFailedLength-range.length) / 2;
fits = NO;
continue;
}
}
}
return range;
}
-(NSString *)middleTruncatedCaption:(NSString*)aCaption withFont:(NSFont*)aFont width:(CGFloat)captionWidth
{
NSArray *components = [aCaption componentsSeparatedByString:#"\n"];
NSString *secondLine = [components objectAtIndex:1];
NSString *newCaption = aCaption;
CGFloat widthOfText = [secondLine widthForHeight:SINGLE_LINE_HEIGHT font:aFont];
if ( widthOfText > captionWidth ) {
//ignore the fact that the length might be an odd/even number "..." will always truncate at least one character
int middleChar = ((int)secondLine.length-1) / 2;
NSString *newSecondLine = nil;
NSString *leftSide = secondLine;
NSString *rightSide = secondLine;
for (int i=1; i <= middleChar; i++) {
leftSide = [secondLine substringToIndex:middleChar-i];
rightSide = [secondLine substringFromIndex:middleChar+i];
newSecondLine = [NSString stringWithFormat:#"%#…%#", leftSide, rightSide];
widthOfText = [newSecondLine widthForHeight:SINGLE_LINE_HEIGHT font:aFont];
if ( widthOfText <= captionWidth ) {
newCaption = [NSString stringWithFormat:#"%#\n%#", [components objectAtIndex:0], newSecondLine];
break;
}
}
}
return newCaption;
}
Cheers!
PS Tested in prototype works great probably has bugs...find them
I suspect there are two labels there. The top one contains the first 20 characters of a file name, and the second contains any overflow, truncated.
The length of the first label is probably restricted based on the user's font settings.
i have set 2 bodies, a world with gravity,a tick method with step,and all the bodies are moving just fine,and i can apply forces on them, gravity is also working.
but no collision.
when body1 hit the ground he just go out of screen and not hit it and jump like a real ball.
when body1 hit body2 the just continue movement as nothing was happen.
the bodies have shape ,the world have edges, but no collision.
what am i missing here ?
here are some functions that i call from the init :
- (void)addBoxBodyForSprite:(CCSprite *)sprite {
b2BodyDef spriteBodyDef;
spriteBodyDef.type = b2_dynamicBody;
spriteBodyDef.position.Set(sprite.position.x/PTM_RATIO,sprite.position.y/PTM_RATIO);
spriteBodyDef.userData = sprite;
spriteBody = world->CreateBody(&spriteBodyDef);
b2PolygonShape spriteShape;
spriteShape.SetAsBox(sprite.contentSize.width/PTM_RATIO/2,sprite.contentSize.height/PTM_RATIO/2);
b2FixtureDef spriteShapeDef;
spriteShapeDef.shape = &spriteShape;
spriteShapeDef.density = 10.0;
spriteShapeDef.isSensor = true;
spriteBody->CreateFixture(&spriteShapeDef);
}
-(void)worldEdge
{
CGSize winSize = [CCDirector sharedDirector].winSize;
b2BodyDef groundBodyDef;
groundBodyDef.position.Set(0,0);
b2Body *groundBody = world->CreateBody(&groundBodyDef);
b2PolygonShape groundBox;
b2FixtureDef boxShapeDef;
boxShapeDef.shape = &groundBox;
groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(winSize.width/PTM_RATIO, 0));
groundBody->CreateFixture(&boxShapeDef);
groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(0, winSize.height/PTM_RATIO));
groundBody->CreateFixture(&boxShapeDef);
groundBox.SetAsEdge(b2Vec2(0, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO));
groundBody->CreateFixture(&boxShapeDef);
groundBox.SetAsEdge(b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, 0));
groundBody->CreateFixture(&boxShapeDef);
}
-(void)tick:(ccTime) dt
{
world->Step(dt,10,10);
for(b2Body *b=world->GetBodyList(); b; b=b->GetNext())
{
if(b->GetUserData() !=NULL )
{
CCSprite *sprite=(CCSprite *) b->GetUserData();//every b of the world will be update his position
sprite.position=ccp( b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO ) ;
sprite.rotation=-1*CC_RADIANS_TO_DEGREES(b->GetAngle());
}
}
everything is moving allright but no collision ever.
The specific problem is this line:
spriteShapeDef.isSensor = true;
In box2d, when you set an fixture as a sensor, it will not collide with other fixtures.
I have a method which returns a bool value, with several exit points.
However, it does not seem to work correctly, so I would like to set an automatic breakpoint to see when it returns a YES value, so I can check all the variables and calculations in the debugger.
I would like to stop the debugger whenever a YES value is returned.
I have a similar smart breakpoint set for objc_exception_throw, so I know it's possible, I am just not sure how.
(In case it helps anyone, the way you can set the exception breakpoint: in the Breakpoints window (Run -> Show -> Breakpoints) enter objc_exception_throw as "Breakpoint", and libobjc.A.dylib as "Location")
EDIT: the specific code I would like to use it for:
- (BOOL)collisionOccured {
// Assumption: helicopter is of square shape (collision calculated by radius), walls are rectangles
// This approach is based on the solution seen here: http://stackoverflow.com/questions/401847/circle-rectangle-collision-detection-intersection/402010#402010
float helicopterImageWidth = [helicopter texture].contentSize.width;
float wallImageWidth = [[walls lastObject] texture].contentSize.width;
float wallImageHeight = [[walls lastObject] texture].contentSize.height;
float helicopterCollisionRadius = helicopterImageWidth * 0.4f;
CGPoint helicopterPosition = helicopter.position;
int numWalls = [walls count];
for (int i = 0; i < numWalls; i++) {
CCSprite *wall = [walls objectAtIndex:i];
if ([wall numberOfRunningActions] == 0) {
// The wall is not moving, we can skip checking it.
continue;
}
CGPoint wallPosition = wall.position;
float helicopterDistanceX = abs(helicopterPosition.x - wallPosition.x - wallImageWidth/2);
float helicopterDistanceY = abs(helicopterPosition.y - wallPosition.y - wallImageHeight/2);
if (helicopterDistanceX > (wallImageWidth/2 + helicopterCollisionRadius)) { return NO; }
if (helicopterDistanceY > (wallImageHeight/2 + helicopterCollisionRadius)) { return NO; }
if (helicopterDistanceX <= (wallImageWidth/2)) { return YES; }
if (helicopterDistanceY <= (wallImageHeight/2)) { return YES; }
float cornerDistance_sq = powf((helicopterDistanceX - wallImageWidth/2), 2) +
powf((helicopterDistanceY - wallImageHeight/2), 2);
return (cornerDistance_sq <= powf(helicopterCollisionRadius, 2));
}
// this should not occur
return NO;
}
This method is called via
- (void)update:(ccTime)delta {
if ([self collisionOccured]) {
NSLog(#"A collision occured");
}
}
The problem is that the update method takes delta (time passed) as argument, so I can't check what's happening frame by frame -- whenever I continue the execution, I am presented with a different scene.
(I am using cocos2d in the code)
You can set conditional breakpoints. With a slight tweak to update:
- (void)update:(ccTime)delta {
BOOL collided = [self collisionOccured];
if (collided) {
NSLog(#"A collision occured");
}
}
you can set a breakpoint as normal after the BOOL's assignment (i.e. on the if line), then right-click on the blue breakpoint arrow and select "Show Message Bubble", and add collided as the Condition. The extra variable should get optimized away in Release build mode.
If you're using a local return variable:
- (BOOL)someMethod {
BOOL ret = NO;
if (something) {
ret = YES;
} else if (something_else) {
ret = YES;
}
// ... and so on
return ret;
}
You can just set a watch point on ret
Otherwise, you're probably stuck with stepping through the code—hopefully some clever combination of conditional breakpoints will help you not have to break on every invocation. Setting a method breakpoint like you do with objc_exception_throw wouldn't work, because it will stop on every invocation, and breaking on the return value at the calling site is too late to figure out how you got there.
If you can post the code, we may be able to give more specific help as to a debugging strategy. Good luck. :-)