Messages

1

General discussions / Need help with scaling Box2D coords

« on: July 02, 2011, 07:34:12 pm »

Nvm it is fixed  

2

General discussions / Need help with scaling Box2D coords

« on: July 02, 2011, 03:51:40 pm »

Hi, I cannot convert the Box2D coords to pixels. Everything I have tried does the same just on a different scale. Does anyone know how to convert them?

3

General / Need help programming GUI

« on: January 02, 2011, 06:53:36 am »

I am writing a GUI and I need help with scroll bars. I have this it works but sometimes if the member contentSize is a certain value it fails (it just freezes the program). I have tried to find the problem but have failed.
Here is the code

Declaration

Code: [Select]


class VScrollBar : public Object
{
int mousepos[2];
bool mousedown;
public:
int pos;
float windowSize;
float contentSize;
float minGripSize;

VScrollBar();
float CalculateGripRatio();
float CalculateGripSize();
float CalculateScrollSize();
float CalculateScrollRatio();
float CalculateGripPosition();
void ValidatePos();
void Draw(sf::RenderWindow*);
protected:
void MouseScroll(int delta)
{
pos -= delta;
}
void MouseHover(float fx, float fy)
{
mousepos[1] = mousepos[0];
mousepos[0] = fy;
if ( mousedown )
{
float gripSize = CalculateGripSize();
float gripPos = CalculateScrollSize() * CalculateScrollRatio();
if ( fy >= gripPos && fy <= gripPos + gripSize )
pos += mousepos[0]-mousepos[1];
}
}

void MousePressed(int i)
{
if ( i == MOUSE_BUTTON_R )
{
/* float mouseRatio = *mousepos/wY;
pos = mouseRatio*contentSize;*/
mousedown = true;
}
}

void MouseReleased(int i)
{
if ( i == MOUSE_BUTTON_R )
mousedown = false;
}

} ;


Definition

Code: [Select]


GUI::VScrollBar::VScrollBar()
{
     wY = 100;
     windowSize = 100;
     contentSize = 200;
     minGripSize = 5;
     pos = 0;
     *(mousepos) = 0;
     *(mousepos + 1) = 0;
     mousedown = false;
}

float GUI::VScrollBar::CalculateGripRatio()
{
     if ( contentSize == 0.f )
          return 0.f;
     return windowSize/contentSize;
}

float GUI::VScrollBar::CalculateGripSize()
{
     float tmp = wY * CalculateGripRatio();
     tmp = tmp < 3?3:tmp;
     return tmp<minGripSize?minGripSize:tmp;
}

float GUI::VScrollBar::CalculateScrollSize()
{
     return wY - CalculateGripSize();
}

float GUI::VScrollBar::CalculateScrollRatio()
{
     return pos/contentSize;
}

void GUI::VScrollBar::ValidatePos()
{
     if ( pos < 0 ) pos = 0;
     float gripPos = CalculateScrollSize() * CalculateScrollRatio();
     while ( gripPos > CalculateScrollSize() )
     {
          pos--;
          gripPos = CalculateScrollSize() * CalculateScrollRatio();
     }
}

void GUI::VScrollBar::Draw(sf::RenderWindow* RENW)
{
     ValidatePos();
     int gripSize = (int) CalculateGripSize();
     gripSize = gripSize < minGripSize?minGripSize:gripSize;
     float gripPos = CalculateScrollSize() * CalculateScrollRatio();
     sf::Shape grip = sf::Shape::Rectangle(pX+2, pY + gripPos, pX+wX-1,pY+gripPos+gripSize,sf::Color(70,70,70),true,sf::Color(200,200,200));
     sf::Shape track = sf::Shape::Rectangle(pX+1, pY, pX+wX,pY+wY,sf::Color(200,200,200),true,sf::Color(70,70,70));
     RENW->Draw(track);
     RENW->Draw(grip);
}

4

General / Separating Axis Theorem

« on: December 05, 2010, 07:53:47 pm »

Alright thanks.

5

General / Separating Axis Theorem

« on: December 05, 2010, 04:11:30 am »

I have already searched google I found this http://www.gamedev.net/reference/programming/features/2dRotatedRectCollision/page2.asp

Step two reads: "[...] project the vectors representing the four corners of each rectangle onto each of the axes. [...]"

I know how to project them onto the axes. But somehow I am stuck I have this:

Code: [Select]


sf::Vector2f Project (sf::Vector2f& v1, sf::Vector2f& v2)
{
sf::Vector2f vec;

float x_ = v1.x * v2.x;
float y_ = v1.y * v2.y;
float d = pow(v2.x, 2) + pow(v2.y, 2);
x_ = (x_ + y_)/d;

vec.x = x_ * v2.x;
vec.y = x_ * v2.y;

return vec;
}

float Dot (sf::Vector2f& v1, sf::Vector2f& v2)
{
return v1.x * v2.x + v1.y * v2.y;
}

sf::Rect<sf::Vector2f> GetRectanglePoints (sf::Shape& Obj)
{
if ( Obj.GetNbPoints() == 4 )
{
sf::Rect<sf::Vector2f> ret;
ret.Top = Obj.GetPointPosition(0); // top-left corner
ret.Right = Obj.GetPointPosition(1); // top-right corner
ret.Bottom = Obj.GetPointPosition(2); // bottom-right corner
ret.Left = Obj.GetPointPosition(3); // bottom-left corner

return ret;
}
}

bool RectsCollide (sf::Rect<sf::Vector2f>& rect1, sf::Rect<sf::Vector2f>& rect2)
{
// Find the axis
sf::Vector2f Axis[4];
Axis[0].x = rect1.Right.x - rect1.Top.x;
Axis[0].y = rect1.Right.y - rect1.Top.y;
Axis[1].x = rect1.Right.x - rect1.Bottom.x;
Axis[1].y = rect1.Right.y - rect1.Bottom.y;
Axis[2].x = rect2.Top.x - rect2.Left.x;
Axis[2].x = rect2.Top.y - rect2.Left.y;
Axis[3].x = rect2.Top.x - rect2.Right.x;
Axis[3].y = rect2.Top.y - rect2.Right.y;

// Project the vectors onto the axis


Now what do I do? I mean do I for each vertex in both rects project them to each axis? or only to a specific one?

6

General / Separating Axis Theorem

« on: December 05, 2010, 02:36:30 am »

Where can I learn how to implement the Separating Axis Theorem into one of my projects?

7

Graphics / [Win API] Can I use an image resource as sf::Image?

« on: December 04, 2010, 07:27:41 am »

Is that possible?

8

Network / Entry Point not Found

« on: December 03, 2010, 02:14:49 am »

No it is certainly 1.6. As 1.6 is the only version I have ever installed.

9

Network / Entry Point not Found

« on: December 02, 2010, 07:40:22 am »

Every compiled program that uses sfml-network gives me this this runtime error: The procedure entry point _ZN2sf9IPAddressC1Ev could not be located in the DLL sfml-network.dll

10

Graphics / is it possible to get fonts size in pixles?

« on: November 06, 2010, 09:56:58 pm »

Yes that is it thanks.

11

Graphics / is it possible to get fonts size in pixles?

« on: November 06, 2010, 05:27:09 pm »

Is it possible to get the width and height of an sf::String object dependent on the font and size in pixels?

12

General / 50% of CPU used to power a simple program

« on: October 24, 2010, 07:40:52 pm »

Oh lol thanks.

13

General / 50% of CPU used to power a simple program

« on: October 24, 2010, 02:25:53 am »

I wanted to know why so much CPU is required to run this

Code: [Select]


#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>

int main()
{
sf::RenderWindow App(sf::VideoMode(800,600,32), "Test app");
sf::Image Back;
if ( !Back.LoadFromFile("background.png") )
App.Close();

sf::Sprite BackSPR;
BackSPR.SetImage(Back);
while ( App.IsOpened() )
{
App.Clear();
sf::Event Event;
while ( App.GetEvent(Event) )
{
if ( Event.Type == sf::Event::Closed )
App.Close();
}
App.Draw(BackSPR);

App.Display();
}

return 0;
}

The compiled program uses about 50% of my CPU.
Some computer info:
RAM 8gb
HDD 1tb
processor 2.6ghz

I am using MinGW to compile.

14

Graphics / need help with image manager.

« on: October 16, 2010, 05:01:46 pm »

I found the problem. It is with RetrieveImage. I made the map public and when I use something like

Code: [Select]


Sprite.SetImage( IM.Data["gfx/player.bmp"] );


It works. So I need to find the problem with RetrieveImage.

15

Graphics / need help with image manager.

« on: October 15, 2010, 11:45:36 pm »

Does anyone know why the images are white? With the correct width and height.