Messages

1

SFML projects / Re: Screenshot Thread

« on: January 07, 2024, 10:53:14 pm »

An exploration RPG in development for a few months now.

2

SFML projects / RarePG, an experimental game

« on: July 07, 2018, 03:36:59 pm »

Hello. I am developing a totally experimental game in my free time using this library.

Next step I think that will be adding a menu, and all ideas from the readme.md

Maybe I left some comment in spanish, but I am moving it to english.

If you wish, you are free to contribute with code, graphics, sounds or whatever

I initially made it as a MVS project, but now it runs under Linux and its compiled with gcc

https://github.com/freesoul/RarePG

You are welcome!

And try to spawn the "rocket" object, I love it

3

General / Re: Global input vs event?

« on: August 13, 2013, 08:44:00 pm »

In which tutorial can I find which system is better? I could read what does events and what does global input, but I didn't find which I should use

4

General / Global input vs event?

« on: August 13, 2013, 07:37:58 pm »

What is better way to get input of mouse/keyboard for a game? Events, or testing global input?

5

Graphics / Re: Need real corner coordinates of rotated rectangle

« on: August 11, 2013, 10:30:56 pm »

Finally I finished my little collision check for rotated rectangles, thanks you. Code below

sat.h

#ifndef SAT_
#define SAT_

#include <SFML/Graphics.hpp>


        struct rectangle {
                sf::Vector2f vertex[4];
        };

class SAT {
public:
        bool collision(sf::Sprite* s1, sf::Sprite* s2);
private:
        void  SAT::project(sf::Vector2f& axis, rectangle* _rectangle, float &min, float &max);
        void normalize(sf::Vector2f& vector);
        float dot(sf::Vector2f& vector1, sf::Vector2f& vector2);
        float SAT::distance(float minA, float maxA, float minB, float maxB) ;
};


#endif

#include <math.h>
#include "SATcollision.h"


void SAT::normalize(sf::Vector2f& vector) {
        const float length = sqrt(vector.x * vector.x + vector.y * vector.y);
        if(length==0)
                return;
        vector.x = vector.x / length;
        vector.y = vector.y / length;
}

float SAT::dot(sf::Vector2f& vector1, sf::Vector2f& vector2)
{
        return vector1.x*vector2.x + vector1.y*vector2.y;
}

float SAT::distance(float minA, float maxA, float minB, float maxB) // Positive return = no hit
{
        if(minB > maxA) return minB-maxA;
        else return minA-maxB;
}




void  SAT::project(sf::Vector2f& axis, rectangle* _rectangle, float &min, float &max)
{
        float _dot = dot(axis, _rectangle->vertex[0]);

        min=_dot;
        max=_dot;

        for(short i=1; i<4; i++)
        {
                _dot = dot(_rectangle->vertex[i], axis);

                if(_dot<min)
                        min=_dot;
                else if(_dot>max)
                        max=_dot;
        }
}


bool SAT::collision(sf::Sprite* s1, sf::Sprite* s2)
{
        rectangle one;
        rectangle two;

        sf::Transform transform = s1->getTransform();
        sf::FloatRect rect = s1->getLocalBounds();

        one.vertex[0]=transform.transformPoint(sf::Vector2f(rect.left, rect.top));
        one.vertex[1]=transform.transformPoint(sf::Vector2f(rect.left+rect.width, rect.top));
        one.vertex[2]=transform.transformPoint(sf::Vector2f(rect.left+rect.width, rect.top+rect.height));
        one.vertex[3]=transform.transformPoint(sf::Vector2f(rect.left, rect.top+rect.height));

        transform = s2->getTransform();
        rect = s2->getLocalBounds();

        two.vertex[0]=transform.transformPoint(sf::Vector2f(rect.left, rect.top));
        two.vertex[1]=transform.transformPoint(sf::Vector2f(rect.left+rect.width, rect.top));
        two.vertex[2]=transform.transformPoint(sf::Vector2f(rect.left+rect.width, rect.top+rect.height));
        two.vertex[3]=transform.transformPoint(sf::Vector2f(rect.left, rect.top+rect.height));

        sf::Vector2f axis;
        float minA;
        float minB;
        float maxA;
        float maxB;
       

        // Test one
        axis.x = one.vertex[1].x - one.vertex[0].x;
        axis.y = one.vertex[1].y - one.vertex[0].y;
        SAT::normalize(axis);

        project(axis, &one, minA, maxA);
        project(axis, &two, minB, maxB);

        if(distance(minA,maxA,minB,maxB)>0.f)
                return false;


        // Test two
        axis.x = one.vertex[3].x - one.vertex[0].x;
        axis.y = one.vertex[3].y - one.vertex[0].y;
        SAT::normalize(axis);

        project(axis, &one, minA, maxA);
        project(axis, &two, minB, maxB);

        if(distance(minA,maxA,minB,maxB)>0.f)
                return false;


        // Test three
        axis.x = two.vertex[1].x - two.vertex[0].x;
        axis.y = two.vertex[1].y - two.vertex[0].y;
        SAT::normalize(axis);

        project(axis, &one, minA, maxA);
        project(axis, &two, minB, maxB);

        if(distance(minA,maxA,minB,maxB)>0.f)
                return false;


        // Test four
        axis.x = two.vertex[3].x - two.vertex[0].x;
        axis.y = two.vertex[3].y - two.vertex[0].y;
        SAT::normalize(axis);

        project(axis, &one, minA, maxA);
        project(axis, &two, minB, maxB);

        if(distance(minA,maxA,minB,maxB)>0.f)
                return false;

        return true;

}

6

Graphics / Re: Need real corner coordinates of rotated rectangle

« on: August 11, 2013, 05:56:42 pm »

Ok thanks. I set origin on centre, but I got rare results.

I got an image sized 223 x 75 px

I put the origin on the middle of the sprite, then rotate it 45º.

I make a point transform to a point (0, 75) and the result is

+      point   {x=-105.35892 y=-51.618793 }   sf::Vector2<float>


Why? -105 on x axis??

My expected result should be like (-10, 10) or so

I guess it has to do with origin. So, how can I rotate at that origin but have the input (0, 75), and the output from normal (0, 0) coord? thanks

7

Graphics / Need real corner coordinates of rotated rectangle

« on: August 11, 2013, 04:12:24 pm »

I want to apply SAT collision detection to my 2D game. As I understood, getGlobalBounds retrieves the bigger box that contains the rotated rectangle, but it isnt what i need. getLocalBounds gives the sprite without transformation, which I could use to get the rotated coords, but I actually dont know how to apply maths to, set an origin and an angle, get the coords ¿is there a way to get the real coordinates of the rotated sprite? thanks.

8

Graphics / Re: Rotation origin

« on: October 06, 2012, 10:14:38 pm »

Oh thanks. Well I can't do that move because I need to keep the global position relative to other sprites I display.

I've done this and it works

transf.rotate(mIt->fDegrees,mIt->spMissile.getPosition().x + mIt->halfWidth, mIt->spMissile.getPosition().y + mIt->halfHeight);
_window.draw(mIt->spMissile, transf);

But I don't know why I have to pass the global center position of the sprite to rotate it, but im glad it works !


Well, I needed to :

- calculate and save half width / height (2 int) for each item.
- save degrees in each items for post-using, instead of using it directly
- declare and define a new local variable sf::transform
- pass it as argument and add global sprite position

all that to do a simple rotation. I still think it would be simpler to add to sf::Transformable a SetRotationOrigin() member (by default rotation origin would be 0,0), but its ok

9

Graphics / Re: Rotation origin

« on: October 06, 2012, 09:32:59 pm »

I don't know what "transform" I should pass as argument :S  I would thank for a simple example.

I want to keep my position coords as (0, 0). So how to rotate at center?

Or an alternative to this (i actually dont know if this is correct):

sprite.setOrigin(center_x, center_y);
sprite.setRotation(angle);
sprite.setOrigin(-center_x, -center_y);

btw, sf::transform::rotate is it absolute or relative?

10

Graphics / Re: Rotation origin

« on: October 06, 2012, 09:24:23 pm »

To do such things, use sf::Transform directly.

How? 

11

Graphics / Re: Rotation origin

« on: October 06, 2012, 09:13:42 pm »

I've read that but I don't get it 

I want to do absolute rotations given some degrees. I've read about sf::Transform, but I don't know how to use that

12

Graphics / Rotation origin

« on: October 06, 2012, 08:42:03 pm »

Hello, I need to draw some stuff with it's origin point (0, 0), but I need to rotate these stuff as the origin was in the center. Is it possible to do this? have two origins: one for rotation, other one for positioning? if not, I suggest to add this feature, thanks !

13

General / Re: Optimizing my main loop.

« on: September 24, 2012, 06:50:46 pm »

Ok sorry it was really long. Well, this is the part of code I think can ralentize more.

I've to say that my game is slow intermittently, 1 sec goes good, 1 sec goes bad

I check for each missile (there can be 1 to 150 at a time) if it's being hit by any of the current bullets casted (1 to 15 aprox)

void Missile_mgr::UpdateAndDrawMissiles(sf::RenderWindow& _window, float elapsedTime) {

        bool bHitByBullet;

         //////// MISSILE LOOP START ///////
        // This could be done with missileList.RemoveAllThatComply_nodeArg() + a condition function... but simplier this way.
        for(std::list<Missile>::iterator mIt = missileList.begin(); mIt!=missileList.end(); )
        {
                mIt->Update(elapsedTime);
                bHitByBullet = false;


                ////// BULLET LOOP START ////////
                for(std::list<Bullet>::iterator bIt=pBullet_mgr->bulletList.begin(); bIt!=pBullet_mgr->bulletList.end(); )
                {

                        if(Collision::BoundingBoxTest(mIt->spMissile, bIt->spBullet)) //// BULLET-MISSILE COLLISION.
                        {
                                mIt->hp -= pPlayer->damage;
                                if(mIt->hp <= 0)
                                {
                                        bHitByBullet=true; // should be bDeadMonster

                                        switch(mIt->type)
                                        {
                                        case Missile::Apple: // DEAD FRUIT -> NO REWARD.
                                                break;
                                        case Missile::Normal:
                                        default:
                                                        pLevel_mgr->xpReward+=10;
                                                        pLevel_mgr->coinReward+=10;
                                        }
                       
                                }

                                pBullet_mgr->bulletList.erase(bIt++);// laser weapon may ignore this line -> go through missiles.
                                                                                                                                                  // we can also break, so only 1 bullet is deleted, no 2. Plus we directly delete missile and no need bool bHitByBullet
                        } else ++bIt;
                       
                }
                ////// BULLET LOOP END ////////

                if(bHitByBullet) {
                        // score already increased in bullet loop. (may hit more than 1 missile)
                        missileList.erase(mIt++);
                } else {
                        if(Collision::BoundingBoxTest(mIt->spMissile, pPlayer->spPlayer)) //// MISSILE HIT PLAYER
                        {
                                switch(mIt->type) {
                                case Missile::Apple:
                                        pPlayer->Heal(1); // to be updated
                                        break;
                                case Missile::Normal:
                                default:
                                        pPlayer->DoDmg(2.5); // to be updated
                                        break;
                                }
                                missileList.erase(mIt++);
                        } else {
                                if(mIt->spMissile.getPosition().y > GROUND_ALTITUDE) { //// MISSILE HIT GROUND
                                        missileList.erase(mIt++);
                                } else { // Nothing happens
                                        _window.draw(mIt->spMissile);
                                        ++mIt;
                                }
                        }

                }

        } //////// MISSILE LOOP END ///////

}

14

General / Optimizing my main loop.

« on: September 24, 2012, 02:52:51 pm »

Hello all, a week ago I started working on my first game project, and a friend recommended me this library, which I found really good

The thing is, as I'm new to game programming, I don't know how to increase FPS. Actually I post this because I've noticed I my sprites stuck a bit while moving. My main code is below, I'm looking just for some advices, thanks

NOTE: this was written using SFML 1.6, I will pass to 2.0 soon.

I'd appreciate some advise to make my main loop more readable, because I'm tired of scrolling up an down to search my game loop case I know, maybe put code into functions, but I avoid calling functions the more I can, I think that ralentizes a bit, doesn't it?

15

General / Re: Window.input() or Mousemove event ?

« on: September 24, 2012, 02:40:12 pm »

Nice, thanks, that was good. I will pass my project to SFML 2.0 soon