bool isDrawing;
Rect2d box;
Mat image;
+ Point2f startPos;
// parameters for drawing from the center
bool drawFromCenter;
- Point2f center;
// initializer list
handlerT() : isDrawing(false), drawFromCenter(true){};
{
if (selectorParams.drawFromCenter)
{
- selectorParams.box.width = 2 * (x - selectorParams.center.x);
- selectorParams.box.height = 2 * (y - selectorParams.center.y);
- selectorParams.box.x = std::min(
- std::max(selectorParams.center.x - selectorParams.box.width / 2.0, 0.), (double)imageSize.width);
- selectorParams.box.y = std::min(
- std::max(selectorParams.center.y - selectorParams.box.height / 2.0, 0.), (double)imageSize.height);
+ // limit half extends to imageSize
+ float halfWidth = std::min(std::min(
+ std::abs(x - selectorParams.startPos.x),
+ selectorParams.startPos.x),
+ imageSize.width - selectorParams.startPos.x);
+ float halfHeight = std::min(std::min(
+ std::abs(y - selectorParams.startPos.y),
+ selectorParams.startPos.y),
+ imageSize.height - selectorParams.startPos.y);
+
+ selectorParams.box.width = halfWidth * 2;
+ selectorParams.box.height = halfHeight * 2;
+ selectorParams.box.x = selectorParams.startPos.x - halfWidth;
+ selectorParams.box.y = selectorParams.startPos.y - halfHeight;
+
}
else
{
- selectorParams.box.width = std::max(
- std::min(x - selectorParams.box.x, (double)imageSize.width - selectorParams.box.x), - selectorParams.box.x);
- selectorParams.box.height = std::max(
- std::min(y - selectorParams.box.y, (double)imageSize.height - selectorParams.box.y), - selectorParams.box.y);
+ // limit x and y to imageSize
+ int lx = std::min(std::max(x, 0), imageSize.width);
+ int by = std::min(std::max(y, 0), imageSize.height);
+ selectorParams.box.width = std::abs(lx - selectorParams.startPos.x);
+ selectorParams.box.height = std::abs(by - selectorParams.startPos.y);
+ selectorParams.box.x = std::min((float)lx, selectorParams.startPos.x);
+ selectorParams.box.y = std::min((float)by, selectorParams.startPos.y);
}
}
break;
case EVENT_LBUTTONDOWN:
selectorParams.isDrawing = true;
selectorParams.box = Rect2d(x, y, 0, 0);
- selectorParams.center = Point2f((float)x, (float)y);
+ selectorParams.startPos = Point2f((float)x, (float)y);
break;
// cleaning up the selected bounding box