void Graph::halfTone(Color color){
int megaPixel = 3;
Vector v;
Color tmp;
int numberOfPixels;
//backup before doing half-toning
backupPixelBuffer();
for(int r = 0 ; r < window_height; r+=megaPixel){ //row
for(int c = 0 ; c < window_width; c+=megaPixel){//col
v = {0,0,0};
for(int i = r; i < r+megaPixel ; i++){ // 3 by 3
for(int j = c; j < c+megaPixel; j++ ){
//DPRINT("r %d, c %d, i %d, j %d\n", r, c, i,j);
tmp = readPixel(j,i);
if( equal(tmp, background_color) )
v = add( v, {1, 1, 1} );
else
v = add( v, ctov( tmp ) );
}
}
//write each mega pixel
numberOfPixels = round( 9- (v.x + v.y + v.z) / 3 );
drawMegaPixel(numberOfPixels, megaPixel * 3, r, c, color);
}
}
}
void renderEffect(Image* output, double elapsedTime)
{
float pixelsPerSecond = 200.f;
int scrollPosition = (int) fmod(elapsedTime * pixelsPerSecond, (double) (2 * ScreenWidth)) - ScreenWidth;
for (int y = 0; y < ScreenHeight; y++)
for (int x = 0; x < ScreenWidth; x++)
{
FloatRGBColor color = readPixel(originalImage, x + scrollPosition, y);
drawPixel(output, x, y, color);
}
}
void renderEffect(Image* output, double elapsedTime)
{
float distortStepTimeScale = 5.f;
float distortStepY = 0.2f;
float widthStepTimeScale = 0.2f;
float widthStepY = 0.02f;
float distortMaxWidth = 20.f;
for (int y = 0; y < ScreenHeight; y++)
{
float maxWidth = (float) (sin(elapsedTime * widthStepTimeScale + y * widthStepY) * distortMaxWidth);
int scrollPosition = (int) (sin(elapsedTime * distortStepTimeScale + y * distortStepY) * maxWidth);
for (int x = 0; x < ScreenWidth; x++)
{
FloatRGBColor color = readPixel(originalImage, x + scrollPosition, y);
drawPixel(output, x, y, color);
}
}
}
