[Development] Rotate image using Opengl

myheart · Aug 20, 2018

Hope this helps!

myheart - [Development] Rotate image using Opengl - RaGEZONE Forums

code:

Code:

class Pos2D
{
public:
    Pos2D(float x= 0.0f, float y = 0.0f)
    {
  this->X = x;
  this->Y = y;
    }
    float X;
    float Y;

public:
    void Set(float x, float y)
    {
  this->X = x;
  this->Y = y;
    }
};

class Vec3D
{
public:
    Vec3D(float x = 0.0f, float y = 0.0f, float z = 0.0f)
    {
  this->X = x;
  this->Y = y;
  this->Z = z;
    }
    float X;
    float Y;
    float Z;

public:
   void SetVertexCoord(Vec3D *Pos, Vec3D *a2)
    {
  this->X = a2->Y * Pos->Y + a2->Z * Pos->Z + Pos->X * a2->X;
  this->Y = a2[1].Y * Pos->X + a2[1].Z * Pos->Y + a2[2].X * Pos->Z;
  this->Z = a2[2].Z * Pos->X + a2[3].X * Pos->Y + a2[3].Y * Pos->Z;
    }

    void SetVertex(Vec3D *lpVertex)
    {
  float PosZ = this->Z * 0.01745329238474369f;
  float v3 = sin(PosZ);
  float v4 = cos(PosZ);
  float PosY = this->Y * 0.01745329238474369f;
  float v6 = sin(PosY);
  float v7 = cos(PosY);
  float PosX = this->X * 0.01745329238474369f;
  float v9 = sin(PosX);
  float v10 = cos(PosX);

  lpVertex->X = v7 * v4;
  lpVertex[1].Y = v7 * v3;
  lpVertex[2].Z = -v6;

  lpVertex->Y = v9 * v6 * v4 + -v3 * v10;
  lpVertex[1].Z = v9 * v6 * v3 + v10 * v4;
  lpVertex[3].X = v9 * v7;

  lpVertex->Z = v10 * v6 * v4 + -v9 * -v3;
  lpVertex[2].X = v10 * v6 * v3 + -v9 * v4;
  lpVertex[3].Y = v10 * v7;

  lpVertex[1].X = 0.0;
  lpVertex[2].Y = 0.0;
  lpVertex[3].Z = 0.0;
    }

    void Set(float R, float G, float B)
    {
  this->X = R;
  this->Y = G;
  this->Z = B;
    }

    Vec3D * Get()
    {
  return this;
    }
};

Code:

void CTexture::RotateImage(int ID, float PosX, float PosY, float Width, float Height, float Angle, float StartX, float StartY, float ScaleX, float ScaleY, float Alpha)
{
    Pos2D TextureCoord[4];
    Vec3D Vertex3f1[4];
    Vec3D VertexCoord[4];
    Vec3D VertexSize[4];

    PosX = WINDOW_WIDTH * PosX / 640.0f;
    PosY = WINDOW_HEIGHT * PosY / 480.0f;
    Width = WINDOW_WIDTH * Width / 640.0f;
    Height = WINDOW_HEIGHT * Height / 480.0f;
    float PosYHeight = WINDOW_HEIGHT - PosY;

    glPushMatrix();

    this->BindTexture(ID);

    VertexSize[0].Set(-Width * 0.5f, Height * 0.5f, 0.0);
    VertexSize[1].Set(-Width * 0.5f, -Height * 0.5f, 0.0);
    VertexSize[2].Set(Width * 0.5f, -Height * 0.5f, 0.0);
    VertexSize[3].Set(Width * 0.5f, Height * 0.5f, 0.0);

   Vec3D VecPos3f(0.0, 0.0, Angle);
    VecPos3f.SetVertex(Vertex3f1);    
    TextureCoord[0].Set(StartX, StartY);
    TextureCoord[1].Set(StartX, (StartY + ScaleY));
    TextureCoord[2].Set((StartX + ScaleX), (StartY + ScaleY));
    TextureCoord[3].Set((StartX + ScaleX), StartY);
    
    glBegin(GL_TRIANGLE_FAN);

    if (Alpha > 0.0)
  glColor4f(1.0f, 1.0f, 1.0f, Alpha);

    for (int i = 0; i < 4; i++)
    {
  glTexCoord2f(TextureCoord[i].X, TextureCoord[i].Y);
  VertexCoord[i].SetVertexCoord(&VertexSize[i], Vertex3f1);
  glVertex2f((VertexCoord[i].X + PosX), (PosYHeight - VertexCoord[i].Y)); //PosYHeight + VertexCoord[i].Y : Used for DrawText
    }

    if (Alpha > 0.0)
  glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

    glEnd();
    glPopMatrix();
}

KarLi · Aug 20, 2018

interesting, for all client versions?

myheart · Aug 21, 2018

KarLi said:
interesting, for all client versions?

yes , for all client version

first post updated!

NaveMu · Aug 21, 2018

Hi, very interesting, you can share complete source or not?

martinx09 · Aug 22, 2018

How to use?

Code:

RotateImage(int ID, float PosX, float PosY, float Width, float Height, float Angle, float StartX, float StartY, float ScaleX, float ScaleY, float Alpha)

I assume ID would be the texture's ID, then.. what's the difference between PosX/PosY and StartX/StartY? Same for Width/Height and ScaleX/ScaleY.. what's the difference?

myheart · Aug 22, 2018

martinx09 said:
How to use?

Code:

RotateImage(int ID, float PosX, float PosY, float Width, float Height, float Angle, float StartX, float StartY, float ScaleX, float ScaleY, float Alpha)

I assume ID would be the texture's ID, then.. what's the difference between PosX/PosY and StartX/StartY? Same for Width/Height and ScaleX/ScaleY.. what's the difference?

Usage: RotateImage(TEXTURE_ID, 100.0, 100.0, 80.0, 80.0, 180.0, 0.0, 0.0, 1.0, 1.0, 1.0)

79jJlyx - [Development] Rotate image using Opengl - RaGEZONE Forums

solarismu · Aug 22, 2018

Cool. I remember I’ve seen this in rotating lottery feature somewhere

...

Sweng · Aug 24, 2018

this->BindTexture(ID); - share source?

NaveMu · Aug 29, 2018

BindTexture(ID), can you share this?

myheart · Aug 30, 2018

NaveMu said:
BindTexture(ID), can you share this?

Code:

bool CTexture::BindTexture(const unsigned int ID)
{
	if (this->m_TextureID.find(ID) != this->m_TextureID.end())
	{
  glBindTexture(GL_TEXTURE_2D, this->m_TextureID[ID]);

  return true;
	}

	return false;
}

you can load .jpg using freeimage library
or .tga using this:

Code:

typedef struct
{
/* +0*/  unsigned char  identsize;          // size of ID field that follows 18 byte header (0 usually)
/* +1*/  unsigned char  colourmaptype;      // type of colour map 0=none, 1=has palette
/* +2*/  unsigned char  imagetype;          // type of image 0=none,1=indexed,2=rgb,3=grey,+8=rle packed
/* +3*/  short colourmapstart;     // first colour map entry in palette
/* +5*/  short colourmaplength;    // number of colours in palette
/* +7*/  unsigned char  colourmapbits;      // number of bits per palette entry 15,16,24,32
/* +8*/  short xstart;             // image x origin
/* +10*/	short ystart;             // image y origin
/* +12*/	short width;              // image width in pixels
/* +14*/	short height;             // image height in pixels
/* +16*/	unsigned char  bits;               // image bits per pixel 8,16,24,32
/* +17*/	unsigned char  descriptor;         // image descriptor bits (vh flip bits)
/* +18*/	unsigned char *data;
} TGA_HEADER;

NaveMu · Sep 4, 2018

myheart said:

Hope this helps!

code:

Code:

class Pos2D
{
public:
    Pos2D(float x= 0.0f, float y = 0.0f)
    {
  this->X = x;
  this->Y = y;
    }
    float X;
    float Y;

public:
    void Set(float x, float y)
    {
  this->X = x;
  this->Y = y;
    }
};

class Vec3D
{
public:
    Vec3D(float x = 0.0f, float y = 0.0f, float z = 0.0f)
    {
  this->X = x;
  this->Y = y;
  this->Z = z;
    }
    float X;
    float Y;
    float Z;

public:
   void SetVertexCoord(Vec3D *Pos, Vec3D *a2)
    {
  this->X = a2->Y * Pos->Y + a2->Z * Pos->Z + Pos->X * a2->X;
  this->Y = a2[1].Y * Pos->X + a2[1].Z * Pos->Y + a2[2].X * Pos->Z;
  this->Z = a2[2].Z * Pos->X + a2[3].X * Pos->Y + a2[3].Y * Pos->Z;
    }

    void SetVertex(Vec3D *lpVertex)
    {
  float PosZ = this->Z * 0.01745329238474369f;
  float v3 = sin(PosZ);
  float v4 = cos(PosZ);
  float PosY = this->Y * 0.01745329238474369f;
  float v6 = sin(PosY);
  float v7 = cos(PosY);
  float PosX = this->X * 0.01745329238474369f;
  float v9 = sin(PosX);
  float v10 = cos(PosX);

  lpVertex->X = v7 * v4;
  lpVertex[1].Y = v7 * v3;
  lpVertex[2].Z = -v6;

  lpVertex->Y = v9 * v6 * v4 + -v3 * v10;
  lpVertex[1].Z = v9 * v6 * v3 + v10 * v4;
  lpVertex[3].X = v9 * v7;

  lpVertex->Z = v10 * v6 * v4 + -v9 * -v3;
  lpVertex[2].X = v10 * v6 * v3 + -v9 * v4;
  lpVertex[3].Y = v10 * v7;

  lpVertex[1].X = 0.0;
  lpVertex[2].Y = 0.0;
  lpVertex[3].Z = 0.0;
    }

    void Set(float R, float G, float B)
    {
  this->X = R;
  this->Y = G;
  this->Z = B;
    }

    Vec3D * Get()
    {
  return this;
    }
};

Code:

void CTexture::RotateImage(int ID, float PosX, float PosY, float Width, float Height, float Angle, float StartX, float StartY, float ScaleX, float ScaleY, float Alpha)
{
    Pos2D TextureCoord[4];
    Vec3D Vertex3f1[4];
    Vec3D VertexCoord[4];
    Vec3D VertexSize[4];

    PosX = WINDOW_WIDTH * PosX / 640.0f;
    PosY = WINDOW_HEIGHT * PosY / 480.0f;
    Width = WINDOW_WIDTH * Width / 640.0f;
    Height = WINDOW_HEIGHT * Height / 480.0f;
    float PosYHeight = WINDOW_HEIGHT - PosY;

    glPushMatrix();

    this->BindTexture(ID);

    VertexSize[0].Set(-Width * 0.5f, Height * 0.5f, 0.0);
    VertexSize[1].Set(-Width * 0.5f, -Height * 0.5f, 0.0);
    VertexSize[2].Set(Width * 0.5f, -Height * 0.5f, 0.0);
    VertexSize[3].Set(Width * 0.5f, Height * 0.5f, 0.0);

   Vec3D VecPos3f(0.0, 0.0, Angle);
    VecPos3f.SetVertex(Vertex3f1);    
    TextureCoord[0].Set(StartX, StartY);
    TextureCoord[1].Set(StartX, (StartY + ScaleY));
    TextureCoord[2].Set((StartX + ScaleX), (StartY + ScaleY));
    TextureCoord[3].Set((StartX + ScaleX), StartY);
    
    glBegin(GL_TRIANGLE_FAN);

    if (Alpha > 0.0)
  glColor4f(1.0f, 1.0f, 1.0f, Alpha);

    for (int i = 0; i < 4; i++)
    {
  glTexCoord2f(TextureCoord[i].X, TextureCoord[i].Y);
  VertexCoord[i].SetVertexCoord(&VertexSize[i], Vertex3f1);
  glVertex2f((VertexCoord[i].X + PosX), (PosYHeight - VertexCoord[i].Y)); //PosYHeight + VertexCoord[i].Y : Used for DrawText
    }

    if (Alpha > 0.0)
  glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

    glEnd();
    glPopMatrix();
}

Bro, could you share with us all this complete source? I'm tempted to do this but I can not, I know you've helped a lot by posting part of it, if not ask too much could you post it complete? I believe it would help many people just like me beginners in OpenGL!

[Development] Rotate image using Opengl

myheart

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KarLi

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myheart

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martinx09

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solarismu

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Sweng

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