# Page

我需要看一下点击IDW后发生了什么

```cpp
connect(action_idw_, SIGNAL(triggered()), this, SLOT(CallIDW()));
```

this:槽函数的接收者对象的指针，在这里是 `MainWindow` 类的当前实例。

所以CallIDW应该是MainWindow类的一个槽函数

```cpp
connect(sender, &SenderClass::signal, receiver, &ReceiverClass::slot);
```

**参数说明：**

1. **sender**：信号的发送者对象的指针。
2. **SenderClass::signal**：发送者类的信号函数指针。
3. **receiver**：槽函数的接收者对象的指针。
4. **ReceiverClass::slot**：接收者类的槽函数指针。

下面是这个槽函数的定义

```
void ImageWarping::CallIDW()
{
	imagewidget_->IDWWarping(spinbox_->value(), checkbox_warp_->checkState() == Qt::Checked);
}
```

```cpp
void ImageWidget::IDWWarping(int setgap, bool warpPoints)
{
	if (warp_type_ != WarpType::None)
	{
		warp_type_ = WarpType::IDW;
		DoWarp(setgap, warpPoints);
	}
}
```

```cpp
void ImageWidget::DoWarp(int setgap, bool warpPoints)
{
	// Check status
	assert(WarpType::Setting != warp_type_);
	if (warp_type_ == WarpType::None)
	{
		return;
	}

	// the case no anchor points is set will be seen as misclick
	if (pair_array_.isEmpty())
	{
		warp_type_ = WarpType::Setting;
		return;
	}

	// Warp the image
	Warping* pwarping_;
	switch (warp_type_)
	{
	case WarpType::IDW:
		pwarping_ = new WarpingIDW(pair_array_);
		break;

	case WarpType::RBF:
		pwarping_ = new WarpingRBF(pair_array_);
		break;

	default:
		break;
	}	
	pwarping_->Warp(ptr_image_, setgap, warpPoints);
	delete pwarping_;

	// Finish warping
	warp_type_ = WarpType::Setting;
	SaveHistory();
	update();
}
```

```cpp
void Warping::Warp(QImage* image_, int setgap, bool warpPoints)
{
	if (image_->isNull())
	{
		return;
	}

	QImage image_tmp(*(image_));
	image_->fill(Qt::white);


	// Initiate squares
	int gap;
	if (setgap <= 0)
	{
		int min = image_tmp.width();
		if (image_tmp.height() < min)
		{
			min = image_tmp.height();
		}
		gap = 1 + min / 20;
	}
	else
	{
		gap = setgap;
	}
	int count_width = 1 + (image_tmp.width() - 1) / gap + (image_tmp.width() % gap != 0);
	int count_height = 1 + (image_tmp.height() - 1) / gap + (image_tmp.height() % gap != 0);
	QVector<QVector<QPoint>> vertices_old(count_width, QVector<QPoint>(count_height , QPoint(0, 0)));
	QVector<QVector<Vector2d>> vertices_new(count_width, QVector<Vector2d>(count_height, Vector2d(0.0, 0.0)));

	for (int i = 0; i < count_width - 1; i++)
	{
		for (int j = 0; j < count_height - 1; j++)
		{
			vertices_old[i][j] = QPoint(i * gap, j * gap);
		}
		vertices_old[i][count_height - 1] = QPoint(i * gap, image_tmp.height() - 1);
	}
	for (int j = 0; j < count_height - 1; j++)
	{
		vertices_old[count_width - 1][j] = QPoint(image_tmp.width() - 1, j * gap);
	}
	vertices_old[count_width - 1][count_height - 1] = QPoint(image_tmp.width() - 1, image_tmp.height() - 1);


	// Do warping to the vertices
	for (int i = 0; i < count_width; i++)
	{
		for (int j = 0; j < count_height; j++)
		{
			vertices_new[i][j] = warp_func(vertices_old[i][j]);
			if (0 <= int(vertices_new[i][j][0]) && int(vertices_new[i][j][0]) < image_tmp.width()
				&& 0 <= int(vertices_new[i][j][1]) && int(vertices_new[i][j][1]) < image_tmp.height())
				image_->setPixel(vertices_new[i][j][0], vertices_new[i][j][1],
					image_tmp.pixel(vertices_old[i][j].x(), vertices_old[i][j].y()));
		}
	}

	// Do warping to each square
	for (int i = 1; i < count_width; i++)
	{
		for (int j = 1; j < count_height; j++)
		{
			// get vertices
			Vector2d A = vertices_new[i - 1][j - 1];
			Vector2d B = vertices_new[i - 1][j];
			Vector2d C = vertices_new[i][j - 1];
			Vector2d D = vertices_new[i][j];
			QPoint A0 = vertices_old[i - 1][j - 1];
			QPoint B0 = vertices_old[i - 1][j];
			QPoint C0 = vertices_old[i][j - 1];
			QPoint D0 = vertices_old[i][j];

			// estimate range of new vertices
			int top = MIN4(A.x(), B.x(), C.x(), D.x());
			top = top >= 0 ? top : 0;
			int bottom = MAX4(A.x(), B.x(), C.x(), D.x());
			bottom = bottom < image_tmp.width() ? bottom : image_tmp.width() - 1;
			int left = MIN4(A.y(), B.y(), C.y(), D.y());
			left = left >= 0 ? left : 0;
			int right = MAX4(A.y(), B.y(), C.y(), D.y());;
			right = right < image_tmp.height() ? right : image_tmp.height() - 1;

			// find inner points of the square and estimate their source points
			for (int row = top; row <= bottom; row++)
			{
				for (int col = left; col <= right; col++)
				{
					if (isInTriangle(A, B, C, row, col))
					{
						Vector2d co = cooridinates(A, B, C, row, col);
						QPoint old = A0 + co[0] * (B0 - A0) + co[1] * (C0 - A0);
						if (old.x() >= 0 && old.y() >= 0
							&& old.x() < image_tmp.width() && old.y() < image_tmp.height())
							image_->setPixel(row, col, image_tmp.pixel(old));
					}
					else if (isInTriangle(D, B, C, row, col))
					{
						Vector2d co = cooridinates(D, B, C, row, col);
						QPoint old = D0 + co[0] * (B0 - D0) + co[1] * (C0 - D0);
						if (old.x() >= 0 && old.y() >= 0
							&& old.x() < image_tmp.width() && old.y() < image_tmp.height())
							image_->setPixel(row, col, image_tmp.pixel(old));
					}
				}
			}
		}
	}

	if (warpPoints)
	{
		for (int i = 0; i < q_.size(); i++)
		{
			Vector2d tmp = warp_func(q_[i]);
			bool anchor = p_[i] == q_[i];
			p_[i] = q_[i];
			q_[i] = QPoint(tmp[0], tmp[1]);
			if (anchor)
			{
				p_[i] = q_[i];
			}
		}
		ReassignPoints();
	}
}
```


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