000
28.02.2006, 20:21 Uhr
WindDancer1
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Hallo Leutz!=-)
Ich habe ein NeHe Tut http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=11 durchgearbeitet, in dem eine Bitmap wie eine Flagge wackelt.
Mein Problem ist, dass das Beispiel mit einem quadratischen Bild arbeitet und ich jetzt aber ein rechteckiges Bild verwenden möchte. Mein Bild wird dann aber quadratisch angezeigt.
Was muss ich ändern, damit mein Bild nicht verzerrt wird???
Vielen Dank im vorraus!
WindDancer 
| C++: |
void initwave()
{
if (!LoadTGA(&textures[0],"Kopie.TGA")) // Lade die Font Textur
{
return;
}
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping ( NEW )
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
glPolygonMode( GL_BACK, GL_FILL ); // Back Face Is Filled In
glPolygonMode( GL_FRONT, GL_LINE ); // Front Face Is Drawn With Lines
// Loop Through The X Plane
for(int x=0; x<45; x++)
{
// Loop Through The Y Plane
for(int y=0; y<45; y++)
{
// Apply The Wave To Our Mesh
points[x][y][0]=float((x/5.0f)-4.5f);
points[x][y][1]=float((y/5.0f)-4.5f);
points[x][y][2]=float(sin((((x/5.0f)*40.0f)/360.0f)*3.141592654*2.0f));
}
}
}
void wave()
{
int x, y; // Loop Variables
float float_x, float_y, float_xb, float_yb; // Used To Break The Flag Into Tiny Quads
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And Depth Buffer
glLoadIdentity(); // Reset The Current Matrix
glTranslatef(0.0f,0.0f,-12.0f); // Translate 12 Units Into The Screen
glBindTexture(GL_TEXTURE_2D, textures[0].texID); // Select Our Texture
glBegin(GL_QUADS); // Start Drawing Our Quads
for( x = 0; x < 44; x++ ) // Loop Through The X Plane (44 Points)
{
for( y = 0; y < 44; y++ ) // Loop Through The Y Plane (44 Points)
{
float_x = float(x)/44.0f; // Create A Floating Point X Value
float_y = float(y)/44.0f; // Create A Floating Point Y Value
float_xb = float(x+1)/44.0f; // Create A Floating Point Y Value+0.0227f
float_yb = float(y+1)/44.0f; // Create A Floating Point Y Value+0.0227f
glTexCoord2f( float_x, float_y); // First Texture Coordinate (Bottom Left)
glVertex3f( points[x][y][0], points[x][y][1], points[x][y][2] );
glTexCoord2f( float_x, float_yb ); // Second Texture Coordinate (Top Left)
glVertex3f( points[x][y+1][0], points[x][y+1][1], points[x][y+1][2] );
glTexCoord2f( float_xb, float_yb ); // Third Texture Coordinate (Top Right)
glVertex3f( points[x+1][y+1][0], points[x+1][y+1][1], points[x+1][y+1][2] );
glTexCoord2f( float_xb, float_y ); // Fourth Texture Coordinate (Bottom Right)
glVertex3f( points[x+1][y][0], points[x+1][y][1], points[x+1][y][2] );
}
}
glEnd(); // Done Drawing Our Quads
if( wiggle_count == 2 ) // Used To Slow Down The Wave (Every 2nd Frame Only)
{
for( y = 0; y < 45; y++ ) // Loop Through The Y Plane
{
hold=points[0][y][2]; // Store Current Value One Left Side Of Wave
for( x = 0; x < 44; x++) // Loop Through The X Plane
{
// Current Wave Value Equals Value To The Right
points[x][y][2] = points[x+1][y][2];
}
points[44][y][2]=hold; // Last Value Becomes The Far Left Stored Value
}
wiggle_count = 0; // Set Counter Back To Zero
}
wiggle_count++; // Increase The Counter
}
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