1
General / Re: vertexArray.append()
« on: November 15, 2014, 07:46:44 pm »
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2
General / vertexArray.append()
« on: November 15, 2014, 07:30:32 pm »
I have searched the forum, read the doc and tutorial sorry if I missed something.
I am trying to draw a trail behind moving planets. Unfortunately, there is an extraline that should not be there linking the last vertex of my vertexArray and the origin of my window. You can see in the picture I uploaded. I have no vertex(0,0) in my array, and even if I had, I am erasing the last points when my array gets larger then 500 points so at some point, it should be erased. However, the extraline is always there and follows the last vertex of my trail.
//MY TRAIL
if(utility_clock.getElapsedTime().asSeconds() > 0.01){
utility_clock.restart();
Vector2f aVec(myState.x, myState.y);
myTrace.push_back(aVec);
}
while(myTrace.size() > 500){
myTrace.erase(myTrace.begin());
}
VertexArray trace(LinesStrip, myTrace.size());
for(vector<Vector2f>::iterator it = myTrace.begin(); it != myTrace.end(); ++it){
it->x -= offset.x;
it->y -= offset.y;
trace.append(Vertex(*it, Color::White));
}
myWin.draw(trace);
I have tried drawing the exact same thing using indexes like in the tutorial, and it works fine.
What's with the function append? Am I using it wrong? I thought it was similar to a push_back function for vectors.
I am trying to draw a trail behind moving planets. Unfortunately, there is an extraline that should not be there linking the last vertex of my vertexArray and the origin of my window. You can see in the picture I uploaded. I have no vertex(0,0) in my array, and even if I had, I am erasing the last points when my array gets larger then 500 points so at some point, it should be erased. However, the extraline is always there and follows the last vertex of my trail.
//MY TRAIL
if(utility_clock.getElapsedTime().asSeconds() > 0.01){
utility_clock.restart();
Vector2f aVec(myState.x, myState.y);
myTrace.push_back(aVec);
}
while(myTrace.size() > 500){
myTrace.erase(myTrace.begin());
}
VertexArray trace(LinesStrip, myTrace.size());
for(vector<Vector2f>::iterator it = myTrace.begin(); it != myTrace.end(); ++it){
it->x -= offset.x;
it->y -= offset.y;
trace.append(Vertex(*it, Color::White));
}
myWin.draw(trace);
I have tried drawing the exact same thing using indexes like in the tutorial, and it works fine.
int cpt = 0;
for(vector<Vector2f>::iterator it = myTrace.begin(); it != myTrace.end(); ++it){
it->x -= offset.x;
it->y -= offset.y;
trace[cpt] = Vertex(*it, Color::White);
cpt++;
}
for(vector<Vector2f>::iterator it = myTrace.begin(); it != myTrace.end(); ++it){
it->x -= offset.x;
it->y -= offset.y;
trace[cpt] = Vertex(*it, Color::White);
cpt++;
}
What's with the function append? Am I using it wrong? I thought it was similar to a push_back function for vectors.
3
General / Re: text causing crash?
« on: November 13, 2014, 04:04:23 am »
All right, I was able to minimize my code I guess. Anybody should be able to copy paste this into a project and run it as it is EXCEPT for the font. You're gonna have to load a font of your own. I tried 2 diffrent ones, so I guess any font will reproduce the problem. This being said, comment the update line, the one that contains
it_bodies->update(myBodies,delta_time);
and your FPS should go up quite a bit. The FPS_manager class found in the code is only there to display the framerate in the console. It can also be used to "regulate" whatever movement you're dealing with, depending on how fast you're computer process the code. I have used it before and has not caused me any problem even if it is not my own work.
Anybody can tell me what is going on?
it_bodies->update(myBodies,delta_time);
and your FPS should go up quite a bit. The FPS_manager class found in the code is only there to display the framerate in the console. It can also be used to "regulate" whatever movement you're dealing with, depending on how fast you're computer process the code. I have used it before and has not caused me any problem even if it is not my own work.
#include <sfml/system.hpp>
#include <sfml/graphics.hpp>
#include <sfml/window.hpp>
#include <iostream>
using namespace std;
using namespace sf;
class FPS_manager
{
private:
float frameCount;
Clock frameClock;
float frameSpeed;
float speedFactor;
public:
FPS_manager();
virtual ~FPS_manager();
void DisplayFrameRate();
void CalculateFrameRate();
float GetSpeedFactor();
protected:
};
FPS_manager::FPS_manager()
{
frameClock.restart();
frameCount = 0;
frameSpeed = 0.0f;
speedFactor = 0.0f;
}
FPS_manager::~FPS_manager()
{
}
void FPS_manager::DisplayFrameRate()
{
frameCount++;
if(frameClock.getElapsedTime().asSeconds() >= 1.0f)
{
frameSpeed = (float)(1 / frameCount);
speedFactor = (float)(60 / frameCount);
std::cout << "FPS: " << frameCount << " TF: " << frameSpeed << " SF: " << speedFactor << std::endl;
frameCount = 0;
frameClock.restart();
}
}
void FPS_manager::CalculateFrameRate()
{
frameCount++;
if(frameClock.getElapsedTime().asSeconds() >= 1.0f)
{
frameSpeed = (float)(1 / frameCount);
speedFactor = (float)(60 / frameCount);
frameCount = 0;
frameClock.restart();
}
}
float FPS_manager::GetSpeedFactor()
{
return speedFactor;
}
class Body
{
public:
Body();
Body(RenderWindow&, Color aFillColor, float aRadius, double true_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName);
~Body();
void update(vector<Body> list_of_bodies, double delta_time);
void draw();
private:
RenderWindow& myWin;
string myName;
double mass;
float radius;
Vector2<double> mySpeed;
Vector2<double> position;
Vector2<double> acceleration;
Font myFont;
Text label1;
double true_radius;
float orientation;
Color fillColor;
};
class Intro
{
public:
Intro(RenderWindow&);
~Intro();
void update();
void initBodies();
private:
RenderWindow& myWin;
Clock chrono;
vector<Body> myBodies;
};
Body::Body(RenderWindow &win, Color aFillColor, float aRadius, double t_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName)
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){
cout << "problem!!" << endl;
}
}
Body::~Body()
{}
void Body::draw()
{
label1.setFont(myFont);
myWin.draw(label1);
}
void Body::update(vector<Body> theBodies, double delta_t)
{
}
Intro::Intro(RenderWindow &win)
:myWin(win)
{
initBodies();
}
Intro::~Intro()
{}
void Intro::initBodies()
{
//EARTH
myBodies.push_back(
Body(myWin, Color::Blue, 2, 6371000, 0, Vector2<double>(0,29800), 0, Vector2<double>(0,0), "Earth"));
}
void Intro::update()
{
double delta_time = chrono.getElapsedTime().asSeconds();
chrono.restart();
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->update(myBodies,delta_time);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
}
int main()
{
ContextSettings settings;
RenderWindow window(VideoMode(1600,1024,32),"Whatever", Style::Default,settings);
FPS_manager mFps;
Intro myIntro(window);
while(true)
{
mFps.DisplayFrameRate();
window.clear();
myIntro.update();
window.display();
}
return 0;
}
#include <sfml/graphics.hpp>
#include <sfml/window.hpp>
#include <iostream>
using namespace std;
using namespace sf;
class FPS_manager
{
private:
float frameCount;
Clock frameClock;
float frameSpeed;
float speedFactor;
public:
FPS_manager();
virtual ~FPS_manager();
void DisplayFrameRate();
void CalculateFrameRate();
float GetSpeedFactor();
protected:
};
FPS_manager::FPS_manager()
{
frameClock.restart();
frameCount = 0;
frameSpeed = 0.0f;
speedFactor = 0.0f;
}
FPS_manager::~FPS_manager()
{
}
void FPS_manager::DisplayFrameRate()
{
frameCount++;
if(frameClock.getElapsedTime().asSeconds() >= 1.0f)
{
frameSpeed = (float)(1 / frameCount);
speedFactor = (float)(60 / frameCount);
std::cout << "FPS: " << frameCount << " TF: " << frameSpeed << " SF: " << speedFactor << std::endl;
frameCount = 0;
frameClock.restart();
}
}
void FPS_manager::CalculateFrameRate()
{
frameCount++;
if(frameClock.getElapsedTime().asSeconds() >= 1.0f)
{
frameSpeed = (float)(1 / frameCount);
speedFactor = (float)(60 / frameCount);
frameCount = 0;
frameClock.restart();
}
}
float FPS_manager::GetSpeedFactor()
{
return speedFactor;
}
class Body
{
public:
Body();
Body(RenderWindow&, Color aFillColor, float aRadius, double true_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName);
~Body();
void update(vector<Body> list_of_bodies, double delta_time);
void draw();
private:
RenderWindow& myWin;
string myName;
double mass;
float radius;
Vector2<double> mySpeed;
Vector2<double> position;
Vector2<double> acceleration;
Font myFont;
Text label1;
double true_radius;
float orientation;
Color fillColor;
};
class Intro
{
public:
Intro(RenderWindow&);
~Intro();
void update();
void initBodies();
private:
RenderWindow& myWin;
Clock chrono;
vector<Body> myBodies;
};
Body::Body(RenderWindow &win, Color aFillColor, float aRadius, double t_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName)
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){
cout << "problem!!" << endl;
}
}
Body::~Body()
{}
void Body::draw()
{
label1.setFont(myFont);
myWin.draw(label1);
}
void Body::update(vector<Body> theBodies, double delta_t)
{
}
Intro::Intro(RenderWindow &win)
:myWin(win)
{
initBodies();
}
Intro::~Intro()
{}
void Intro::initBodies()
{
//EARTH
myBodies.push_back(
Body(myWin, Color::Blue, 2, 6371000, 0, Vector2<double>(0,29800), 0, Vector2<double>(0,0), "Earth"));
}
void Intro::update()
{
double delta_time = chrono.getElapsedTime().asSeconds();
chrono.restart();
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->update(myBodies,delta_time);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
}
int main()
{
ContextSettings settings;
RenderWindow window(VideoMode(1600,1024,32),"Whatever", Style::Default,settings);
FPS_manager mFps;
Intro myIntro(window);
while(true)
{
mFps.DisplayFrameRate();
window.clear();
myIntro.update();
window.display();
}
return 0;
}
Anybody can tell me what is going on?
4
General / Re: text causing crash?
« on: November 13, 2014, 03:26:56 am »
OK, I will post a minimal code asap. Nevertheless, I thought somebody would be able to figure something out with my current code because the code that wasn't posted, to my knowledge, has nothing to do with my problem. This being said, making a minimal code with my current program is not that easy. I still need my Body class and my Intro class. I'll do my best to post some code that can run right off the bat. Give me a few minutes.
5
General / Re: text causing crash?
« on: November 13, 2014, 12:37:12 am »
Here is the minimal code, and the exact lines and situation that slows down my program drastically :
Here is the content of those 2 functions (comments were erased for readability.....)
Here are the 2 possibilities that my program is not slowed down :
I point out that if I don't setFont() in my draw() function but still drawing the label (sf::Text), I get 3000 fps. If I don't draw the label but still do the setFont(), I also get 3000 fps. If I do both while updating my body (only one in the vector), I get 800 fps.
Also, If I don't update my body, I can do the draw function with both setFont() and draw() and I get 3000 fps.
I have attached a picture to show what it looks like (not much to be seen unfortunately)
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
Here is the content of those 2 functions (comments were erased for readability.....)
void Body::update(vector<Body> theBodies, double delta_t)
{
}
{
}
void Body::draw()
{
label.setFont(myFont);
myWin.draw(label);
}
{
label.setFont(myFont);
myWin.draw(label);
}
Here are the 2 possibilities that my program is not slowed down :
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
//it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
//it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->draw();
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
//it_bodies->draw();
}
it_bodies->update(myBodies,delta_time * timing_var);
}
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
//it_bodies->draw();
}
I point out that if I don't setFont() in my draw() function but still drawing the label (sf::Text), I get 3000 fps. If I don't draw the label but still do the setFont(), I also get 3000 fps. If I do both while updating my body (only one in the vector), I get 800 fps.
Also, If I don't update my body, I can do the draw function with both setFont() and draw() and I get 3000 fps.
I have attached a picture to show what it looks like (not much to be seen unfortunately)
6
General / text causing crash?
« on: November 12, 2014, 03:31:41 am »
I've been trying to draw a label (sf::Text) for a couple hour and my program has been crashing for a reason I can't tell. I used to print a few labels for information output with the same font and within the same class even, but now, it crashes when I draw the sf::Text and ouputs Violation access error.
Can sombebody see my mistake ?
**update, I have found a way to not crash my program, but more problems occur, see lower down
Clas definition
Constructor
Draw function
And for whoever wonders, here is when I call the draw function
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
if(!myPause){
it_bodies->setPosition(Vector2f(it_bodies->getPosition().x - temp_position.x, it_bodies->getPosition().y - temp_position.y));
}
it_bodies->draw();
}
any abvious mistake? Am I victim of the randomly crashing fonts ?
please help!
More testing :
I tried to draw the Text in the constructor and the program did not crash :
Further testing brings up more questions : When I comment or uncomment those lines, in the constructor of the Body class, my FPS goes from 70+ when commented to 2 when uncommented. ?!?!? Note that I am not drawing the sf::Text, I am only initiating some of it's attributes. For the record, I only have 9 of these objects, 1 for the sun, and 8 for planets (yes, it is a solar system simulation)
ok... One last update : I tried setting up the attributes within the draw function instead of the constructor, SURPSIE! my program doesn't crash! Nevertheless, it still drops the FPS drastically. Of course, I would normally not do that because setting atributes multiple times with the same value is a waste of ressources.
This is never ending, here is another update... I found one line of code that slows down my program by a lot :
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
if(!myPause){
it_bodies->update(myBodies,delta_time * timing_var); //THIS LINE SUCKS THE JUICE
if(it_bodies->getName() == "Earth"){
temp_position = Vector2<double>(it_bodies->getPosition().x - temp_position.x, it_bodies->getPosition().y - temp_position.y);
}
}
}
you will never guess what is in that function...... COMMENTS!!! yes, only comments.... no actual line of code. Nevertheless, calling that function brings my fps from 1500, down to 700 even if I have only one object in that vector................
Here is the code in case anybody cares :
Can sombebody see my mistake ?
**update, I have found a way to not crash my program, but more problems occur, see lower down
Clas definition
class Body
{
public:
Body();
Body(RenderWindow&, Color aFillColor, float aRadius, double true_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName);
~Body();
CircleShape getCricle();
Derivative initialDerivative(State, double delta_time, vector<Body>);
Derivative nextDerivative(State, Derivative, double delta_time, vector<Body>);
Vector2<double> calc_acceleration(State aState, double delta_time, vector<Body>);
void update(vector<Body> list_of_bodies, double delta_time);
void draw();
bool collide(Body const& aBody);
//GET
string getName();
Vector2<double> getPosition();
float getRadius();
//SET
void setPosition(Vector2f);
//operators
void operator=(Body const& b);
bool operator==(Body const& a);
bool operator>(Body const& a);
private:
RenderWindow& myWin;
CircleShape circle;
string myName;
double mass;
float radius;
Vector2<double> mySpeed;
Vector2<double> position;
Vector2<double> acceleration;
State myState;
double last_chrono;
double true_radius;
double f;
double a;
Font myFont;
Text label;
float orientation;
Color fillColor;
int cpt;
Clock myClock;
Clock utility_clock;
double time;
};
{
public:
Body();
Body(RenderWindow&, Color aFillColor, float aRadius, double true_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName);
~Body();
CircleShape getCricle();
Derivative initialDerivative(State, double delta_time, vector<Body>);
Derivative nextDerivative(State, Derivative, double delta_time, vector<Body>);
Vector2<double> calc_acceleration(State aState, double delta_time, vector<Body>);
void update(vector<Body> list_of_bodies, double delta_time);
void draw();
bool collide(Body const& aBody);
//GET
string getName();
Vector2<double> getPosition();
float getRadius();
//SET
void setPosition(Vector2f);
//operators
void operator=(Body const& b);
bool operator==(Body const& a);
bool operator>(Body const& a);
private:
RenderWindow& myWin;
CircleShape circle;
string myName;
double mass;
float radius;
Vector2<double> mySpeed;
Vector2<double> position;
Vector2<double> acceleration;
State myState;
double last_chrono;
double true_radius;
double f;
double a;
Font myFont;
Text label;
float orientation;
Color fillColor;
int cpt;
Clock myClock;
Clock utility_clock;
double time;
};
Constructor
Body::Body(RenderWindow &win, Color aFillColor, float aRadius, double t_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName)
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
acceleration = Vector2<double>(0,0);
myState = State(position.x, position.y, mySpeed.x, mySpeed.y);
circle.setPosition(position.x, position.y);
circle.setFillColor(fillColor);
circle.setRadius(true_radius/dist_adjust);
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){ //Font loading IS successfull
cout << "problem!!" << endl;
}
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
cout << true_radius/dist_adjust << endl;
circle.setOrigin(circle.getLocalBounds().width/2,circle.getLocalBounds().height/2);
last_chrono = 0;
myClock.restart();
}
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
acceleration = Vector2<double>(0,0);
myState = State(position.x, position.y, mySpeed.x, mySpeed.y);
circle.setPosition(position.x, position.y);
circle.setFillColor(fillColor);
circle.setRadius(true_radius/dist_adjust);
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){ //Font loading IS successfull
cout << "problem!!" << endl;
}
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
cout << true_radius/dist_adjust << endl;
circle.setOrigin(circle.getLocalBounds().width/2,circle.getLocalBounds().height/2);
last_chrono = 0;
myClock.restart();
}
Draw function
void Body::draw()
{
circle.setRadius(radius);
circle.setPosition(Vector2f(myState.x, myState.y));
myWin.draw(circle);
label.setPosition(myState.x - radius, myState.y - radius - label.getLocalBounds().height);
myWin.draw(label); //THE PROGRAM CRASHES HERE!
}
{
circle.setRadius(radius);
circle.setPosition(Vector2f(myState.x, myState.y));
myWin.draw(circle);
label.setPosition(myState.x - radius, myState.y - radius - label.getLocalBounds().height);
myWin.draw(label); //THE PROGRAM CRASHES HERE!
}
And for whoever wonders, here is when I call the draw function
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
if(!myPause){
it_bodies->setPosition(Vector2f(it_bodies->getPosition().x - temp_position.x, it_bodies->getPosition().y - temp_position.y));
}
it_bodies->draw();
}
any abvious mistake? Am I victim of the randomly crashing fonts ?
please help!
More testing :
I tried to draw the Text in the constructor and the program did not crash :
Body::Body(RenderWindow &win, Color aFillColor, float aRadius, double t_radius, double aMass, Vector2<double> aSpeed, float anOrientation, Vector2<double> aPosition, string aName)
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
acceleration = Vector2<double>(0,0);
myState = State(position.x, position.y, mySpeed.x, mySpeed.y);
circle.setPosition(position.x, position.y);
circle.setFillColor(fillColor);
circle.setRadius(true_radius/dist_adjust);
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){
cout << "problem!!" << endl;
}
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
myWin.draw(label); //HERE IS WHERE MY TEXT IS DRAWN
cout << true_radius/dist_adjust << endl;
circle.setOrigin(circle.getLocalBounds().width/2,circle.getLocalBounds().height/2);
last_chrono = 0;
myClock.restart();
}
:myWin(win), fillColor(aFillColor), radius(aRadius), true_radius(t_radius), mySpeed(aSpeed), mass(aMass), orientation(anOrientation), position(aPosition), myName(aName)
{
acceleration = Vector2<double>(0,0);
myState = State(position.x, position.y, mySpeed.x, mySpeed.y);
circle.setPosition(position.x, position.y);
circle.setFillColor(fillColor);
circle.setRadius(true_radius/dist_adjust);
if(!myFont.loadFromFile("ressources/Fonts/arial.ttf")){
cout << "problem!!" << endl;
}
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
myWin.draw(label); //HERE IS WHERE MY TEXT IS DRAWN
cout << true_radius/dist_adjust << endl;
circle.setOrigin(circle.getLocalBounds().width/2,circle.getLocalBounds().height/2);
last_chrono = 0;
myClock.restart();
}
Further testing brings up more questions : When I comment or uncomment those lines, in the constructor of the Body class, my FPS goes from 70+ when commented to 2 when uncommented. ?!?!? Note that I am not drawing the sf::Text, I am only initiating some of it's attributes. For the record, I only have 9 of these objects, 1 for the sun, and 8 for planets (yes, it is a solar system simulation)
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
ok... One last update : I tried setting up the attributes within the draw function instead of the constructor, SURPSIE! my program doesn't crash! Nevertheless, it still drops the FPS drastically. Of course, I would normally not do that because setting atributes multiple times with the same value is a waste of ressources.
void Body::draw()
{
circle.setRadius(radius);
circle.setPosition(Vector2f(myState.x, myState.y));
myWin.draw(circle);
label.setPosition(myState.x - radius, myState.y - radius - label.getLocalBounds().height);
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
myWin.draw(label);
}
{
circle.setRadius(radius);
circle.setPosition(Vector2f(myState.x, myState.y));
myWin.draw(circle);
label.setPosition(myState.x - radius, myState.y - radius - label.getLocalBounds().height);
label.setFont(myFont);
label.setCharacterSize(12);
label.setColor(Color::Black);
label.setString(myName);
myWin.draw(label);
}
This is never ending, here is another update... I found one line of code that slows down my program by a lot :
for(vector<Body>::iterator it_bodies = myBodies.begin(); it_bodies != myBodies.end(); ++it_bodies){
if(!myPause){
it_bodies->update(myBodies,delta_time * timing_var); //THIS LINE SUCKS THE JUICE
if(it_bodies->getName() == "Earth"){
temp_position = Vector2<double>(it_bodies->getPosition().x - temp_position.x, it_bodies->getPosition().y - temp_position.y);
}
}
}
you will never guess what is in that function...... COMMENTS!!! yes, only comments.... no actual line of code. Nevertheless, calling that function brings my fps from 1500, down to 700 even if I have only one object in that vector................
Here is the code in case anybody cares :
void Body::update(vector<Body> theBodies, double delta_t)
{
/*
Derivative derivative_a = initialDerivative(myState, delta_t, theBodies);
Derivative derivative_b = nextDerivative(myState, derivative_a, delta_t * 0.5, theBodies);
Derivative derivative_c = nextDerivative(myState, derivative_b, delta_t * 0.5, theBodies);
Derivative derivative_d = nextDerivative(myState, derivative_c, delta_t, theBodies);
double one_over_six = 1.f/6.f;
double dxdt = one_over_six * (derivative_a.vx + 2.f * (derivative_b.vx + derivative_c.vx) + derivative_d.vx);
double dydt = one_over_six * (derivative_a.vy + 2.f * (derivative_b.vy + derivative_c.vy) + derivative_d.vy);
double dvxdt = one_over_six * (derivative_a.ax + 2.f * (derivative_b.ax + derivative_c.ax) + derivative_d.ax);
double dvydt =one_over_six * (derivative_a.ay + 2.f * (derivative_b.ay + derivative_c.ay) + derivative_d.ay);
//UPDATING SPEED AND POSITION (position in pixels, and speed in meters / seconds)
myState.x += dxdt * delta_t / dist_adjust;
myState.y += dydt * delta_t / dist_adjust;
myState.vx += dvxdt * delta_t;
myState.vy += dvydt * delta_t;
*/
/*
if(myName == "Earth"){
stringstream str_a;
stringstream str_g;
stringstream str_r;
stringstream str_f;
stringstream str_speed_x;
stringstream str_speed_y;
stringstream str_speed;
stringstream str_correction_x;
str_g << fixed << setprecision( 20 ) << gravity;
str_f << fixed << setprecision( 20 ) << f;
str_a << fixed << setprecision( 20 ) << a;
str_speed_x << fixed << setprecision( 20 ) << myState.vx;
str_speed_y << fixed << setprecision( 20 ) << myState.vy;
str_speed << fixed << setprecision( 20 ) << sqrt(myState.vy * myState.vy + myState.vx * myState.vx);
Text planete;
planete.setPosition(0,0);
planete.setColor(Color::Black);
planete.setCharacterSize(15);
planete.setFont(font);
planete.setString(" x = " + to_string(myState.x) + ", y = " + to_string(myState.y));
planete.setPosition(0,20);
myWin.draw(planete);
planete.setString("ratio = " + to_string((py - position.y)/(px - position.x)));
planete.setPosition(0,40);
myWin.draw(planete);
planete.setString("delta_time = " + to_string(time_temp));
planete.setPosition(0,60);
myWin.draw(planete);
planete.setString("vitesse x = " + str_speed_x.str());
planete.setPosition(300,0);
myWin.draw(planete);
planete.setString("vitesse y = " + str_speed_y.str());
planete.setPosition(300,20);
myWin.draw(planete);
planete.setString("Vitesse totale = " + str_speed.str());
planete.setPosition(300,40);
myWin.draw(planete);
planete.setString("accélération = " + str_a.str());
planete.setPosition(300,60);
myWin.draw(planete);
planete.setString("distance = " + str_r.str());
planete.setPosition(300,80);
myWin.draw(planete);
planete.setString("force = " + str_f.str());
planete.setPosition(700,0);
myWin.draw(planete);
}*/
}
{
/*
Derivative derivative_a = initialDerivative(myState, delta_t, theBodies);
Derivative derivative_b = nextDerivative(myState, derivative_a, delta_t * 0.5, theBodies);
Derivative derivative_c = nextDerivative(myState, derivative_b, delta_t * 0.5, theBodies);
Derivative derivative_d = nextDerivative(myState, derivative_c, delta_t, theBodies);
double one_over_six = 1.f/6.f;
double dxdt = one_over_six * (derivative_a.vx + 2.f * (derivative_b.vx + derivative_c.vx) + derivative_d.vx);
double dydt = one_over_six * (derivative_a.vy + 2.f * (derivative_b.vy + derivative_c.vy) + derivative_d.vy);
double dvxdt = one_over_six * (derivative_a.ax + 2.f * (derivative_b.ax + derivative_c.ax) + derivative_d.ax);
double dvydt =one_over_six * (derivative_a.ay + 2.f * (derivative_b.ay + derivative_c.ay) + derivative_d.ay);
//UPDATING SPEED AND POSITION (position in pixels, and speed in meters / seconds)
myState.x += dxdt * delta_t / dist_adjust;
myState.y += dydt * delta_t / dist_adjust;
myState.vx += dvxdt * delta_t;
myState.vy += dvydt * delta_t;
*/
/*
if(myName == "Earth"){
stringstream str_a;
stringstream str_g;
stringstream str_r;
stringstream str_f;
stringstream str_speed_x;
stringstream str_speed_y;
stringstream str_speed;
stringstream str_correction_x;
str_g << fixed << setprecision( 20 ) << gravity;
str_f << fixed << setprecision( 20 ) << f;
str_a << fixed << setprecision( 20 ) << a;
str_speed_x << fixed << setprecision( 20 ) << myState.vx;
str_speed_y << fixed << setprecision( 20 ) << myState.vy;
str_speed << fixed << setprecision( 20 ) << sqrt(myState.vy * myState.vy + myState.vx * myState.vx);
Text planete;
planete.setPosition(0,0);
planete.setColor(Color::Black);
planete.setCharacterSize(15);
planete.setFont(font);
planete.setString(" x = " + to_string(myState.x) + ", y = " + to_string(myState.y));
planete.setPosition(0,20);
myWin.draw(planete);
planete.setString("ratio = " + to_string((py - position.y)/(px - position.x)));
planete.setPosition(0,40);
myWin.draw(planete);
planete.setString("delta_time = " + to_string(time_temp));
planete.setPosition(0,60);
myWin.draw(planete);
planete.setString("vitesse x = " + str_speed_x.str());
planete.setPosition(300,0);
myWin.draw(planete);
planete.setString("vitesse y = " + str_speed_y.str());
planete.setPosition(300,20);
myWin.draw(planete);
planete.setString("Vitesse totale = " + str_speed.str());
planete.setPosition(300,40);
myWin.draw(planete);
planete.setString("accélération = " + str_a.str());
planete.setPosition(300,60);
myWin.draw(planete);
planete.setString("distance = " + str_r.str());
planete.setPosition(300,80);
myWin.draw(planete);
planete.setString("force = " + str_f.str());
planete.setPosition(700,0);
myWin.draw(planete);
}*/
}
7
General / RenderTexture inverts pixels?
« on: March 02, 2014, 07:15:09 pm »
Hi,
I'm trying to make a mask (2d vector of boolean) from a rotated sprite. When I print the mask to the console as 1 for true, and 0 for false, the 1s are never where I would expect them to be. Here is one exemple of a case that I dont understand.
In the case I just printed, I get this in the console for the case where the angle = 0.
Even if you see a cout mentionning compensation, I am not applying it. Nevertheless, what I see in the console is not far from what I would expect. I expected the image to be a inverted version of this one. The 1s should be top, not at the bottom of the console output. Since my origin is at half-height, I know I'm suppose to "lose" half of the pixels, but why do I lose the bottom ones? Furthermore, I tried to draw the Sprite to my renderwindow before building my image, and It shows exactly what I would expect to find in my console :
Furthermore, I tried something while writting this post and I found that if I print the image like this :
I actually get the same result I got by printing in the console. But why!? Why are the pixels inverted in the image?
Hope I was clear.
******************EDIT*********************
Sorry about the language, I didnt notice it was the french section of the forum (I am french canadian....)
Anyways, I tested something using renderTexture and I now know that render texture inverts the pixels. Here is the code I used to test (I tried to make it testable for others but you'll need your own renderwindow) :
Sprite utilitySprite;
Texture utilityTexture;
utilityTexture.loadFromFile("Ressources/meteor.png");
utilitySprite.setTexture(utilityTexture);
utilitySprite.setPosition(200,0);
MyWin.draw(utilitySprite);
RenderTexture newRT;
Image newImage;
Texture newTexture;
utilitySprite.setPosition(0,0);
newRT.create(utilitySprite.getLocalBounds().width, utilitySprite.getLocalBounds().height);
newRT.clear(Color::Yellow);
newRT.draw(utilitySprite);
newTexture = newRT.getTexture();
newImage = newTexture.copyToImage();
Texture aTexture;
aTexture.loadFromImage(newImage);
//Sprite newSprite(aTexture);
Sprite newSprite(newRT.getTexture());
newSprite.setPosition(400,0);
MyWin.draw(newSprite);
here is what was rendered :
Am I doing something wrong ? or should I flip the texture myself?
I'm trying to make a mask (2d vector of boolean) from a rotated sprite. When I print the mask to the console as 1 for true, and 0 for false, the 1s are never where I would expect them to be. Here is one exemple of a case that I dont understand.
void maskByAngle::buildMasks(bar aBar)
{
if(aBar.isLeft()){
int angle = -30;
Texture wtvTexture;
Sprite tempSprite;
wtvTexture.loadFromFile("Ressources/bar_left.png");
tempSprite.setTexture(wtvTexture);
tempSprite.setOrigin(0,tempSprite.getLocalBounds().height/2);
while(angle <= 30){
RenderTexture newRT;
newRT.create(tempSprite.getGlobalBounds().width, tempSprite.getGlobalBounds().height);
tempSprite.setPosition(0,0);
newRT.draw(tempSprite);
Texture myTexture = newRT.getTexture();
Image myImage = myTexture.copyToImage();
newRT.clear(Color::Black);
std::cout << "X = " << myImage.getSize().x << " Y = " << myImage.getSize().y << endl;
vector<vector<bool>> vBBTemp;
for(int y = 0; y < myImage.getSize().y; ++y){
vector<bool> vBTemp;
for(int x = 0; x < myImage.getSize().x; ++x){
if(myImage.getPixel(x,y).a > 200){
vBTemp.push_back(true);
std::cout << 1;
}else{
vBTemp.push_back(false);
std::cout << 0;
}
}
std::cout << endl;
vBBTemp.push_back(vBTemp);
}
myMasksLeft.push_back(vBBTemp);
++angle;
}
}else if(!aBar.isLeft()){
{
if(aBar.isLeft()){
int angle = -30;
Texture wtvTexture;
Sprite tempSprite;
wtvTexture.loadFromFile("Ressources/bar_left.png");
tempSprite.setTexture(wtvTexture);
tempSprite.setOrigin(0,tempSprite.getLocalBounds().height/2);
while(angle <= 30){
RenderTexture newRT;
newRT.create(tempSprite.getGlobalBounds().width, tempSprite.getGlobalBounds().height);
tempSprite.setPosition(0,0);
newRT.draw(tempSprite);
Texture myTexture = newRT.getTexture();
Image myImage = myTexture.copyToImage();
newRT.clear(Color::Black);
std::cout << "X = " << myImage.getSize().x << " Y = " << myImage.getSize().y << endl;
vector<vector<bool>> vBBTemp;
for(int y = 0; y < myImage.getSize().y; ++y){
vector<bool> vBTemp;
for(int x = 0; x < myImage.getSize().x; ++x){
if(myImage.getPixel(x,y).a > 200){
vBTemp.push_back(true);
std::cout << 1;
}else{
vBTemp.push_back(false);
std::cout << 0;
}
}
std::cout << endl;
vBBTemp.push_back(vBTemp);
}
myMasksLeft.push_back(vBBTemp);
++angle;
}
}else if(!aBar.isLeft()){
In the case I just printed, I get this in the console for the case where the angle = 0.
Even if you see a cout mentionning compensation, I am not applying it. Nevertheless, what I see in the console is not far from what I would expect. I expected the image to be a inverted version of this one. The 1s should be top, not at the bottom of the console output. Since my origin is at half-height, I know I'm suppose to "lose" half of the pixels, but why do I lose the bottom ones? Furthermore, I tried to draw the Sprite to my renderwindow before building my image, and It shows exactly what I would expect to find in my console :
Furthermore, I tried something while writting this post and I found that if I print the image like this :
Texture aTexture;
aTexture.loadFromImage(myImage);
Sprite aSprite(aTexture);
myWin.draw(aSprite);
aTexture.loadFromImage(myImage);
Sprite aSprite(aTexture);
myWin.draw(aSprite);
I actually get the same result I got by printing in the console. But why!? Why are the pixels inverted in the image?
Hope I was clear.
******************EDIT*********************
Sorry about the language, I didnt notice it was the french section of the forum (I am french canadian....)
Anyways, I tested something using renderTexture and I now know that render texture inverts the pixels. Here is the code I used to test (I tried to make it testable for others but you'll need your own renderwindow) :
Sprite utilitySprite;
Texture utilityTexture;
utilityTexture.loadFromFile("Ressources/meteor.png");
utilitySprite.setTexture(utilityTexture);
utilitySprite.setPosition(200,0);
MyWin.draw(utilitySprite);
RenderTexture newRT;
Image newImage;
Texture newTexture;
utilitySprite.setPosition(0,0);
newRT.create(utilitySprite.getLocalBounds().width, utilitySprite.getLocalBounds().height);
newRT.clear(Color::Yellow);
newRT.draw(utilitySprite);
newTexture = newRT.getTexture();
newImage = newTexture.copyToImage();
Texture aTexture;
aTexture.loadFromImage(newImage);
//Sprite newSprite(aTexture);
Sprite newSprite(newRT.getTexture());
newSprite.setPosition(400,0);
MyWin.draw(newSprite);
here is what was rendered :
Am I doing something wrong ? or should I flip the texture myself?
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