Created
April 12, 2012 23:56
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A negative filter brush
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| void FilterBrush::mouseMoveEvent(QMouseEvent* event, PaintArea *ourImage) | |
| { | |
| QImage* qImage = ourImage->getImage(); | |
| int xCenter = event->pos().x(), yCenter = event->pos().y() , radius = 35; | |
| int left = xCenter - radius; | |
| int right = left + radius * 2; | |
| int top = yCenter - radius; | |
| int bottom = top + radius * 2; | |
| char *x, *y; | |
| x = new char(); | |
| y = new char(); | |
| for (int yPos = Top; yPos <= Bottom; ++yPos) | |
| { | |
| for (int xPos = Left; xPos <= Right; ++xPos) | |
| { | |
| double dist = pow(xCenter - xPos, 2.0) + pow(yCenter - yPos, 2.0); | |
| if (dist <= pow(radius, 2.0)) | |
| { | |
| itoa(xPos, x, 10); | |
| itoa(yPos, y,10); | |
| if(this->pixels.find(*x+"w"+*y) != this->pixels.end()) | |
| continue; | |
| this->pixels[*x+"w"+*y] = new QPoint(xPos, yPos); | |
| QRgb color = yup->pixel(xPos, yPos); | |
| QColor edit(color); | |
| int red = 255 - edit.red(); | |
| int blue = 255 - edit.blue(); | |
| int green = 255 - edit.green(); | |
| color = qRgb(red, green, blue); | |
| yup->setPixel(xPos, yPos,color); | |
| } | |
| ourImage->update(); | |
| } | |
| } | |
| } |
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What started off as an error quickly becomes understood and evolves into a neat feature!
You get a star!