src/tools/drawtool.cpp

#include <QMessageBox>
#include "drawtool.h"

static const QBrush pointBrush = {Qt::white};
static const QPen polygonPen = {QBrush{Qt::black}, 2.0, Qt::DashLine};
static const QPen pointPen = {QBrush{Qt::black}, 2.0};
static const QBrush polygonBrush = {QColor{64, 255, 128, 192}};

DrawTool::DrawTool(QObject* parent) :
	BaseTool{parent} {}

QString DrawTool::name() const
{
	static const QString result = tr("Draw");
	return result;
}

QString DrawTool::toolTip() const
{
	static const QString result = tr("Draw new elements into the model.");
	return result;
}

bool DrawTool::mouseClick(const Canvas::MouseClickInfo& info)
{
	if (info.worldPosition.has_value())
	{
		const glm::vec3& pos = info.worldPosition.value();
		const auto isCloseToPos = [&](const glm::vec3& x){return geom::isclose(x, pos);};
		if (any(this->polygon, isCloseToPos))
		{
			this->closeShape();
		}
		else
		{
			this->polygon.push_back(pos);
			if (this->polygon.size() == 4)
			{
				this->closeShape();
			}
		}
	}
	this->previewPolygon = this->polygon;
	return true;
}

bool DrawTool::mouseMove(const Canvas::MouseMoveInfo& info)
{
	if (info.worldPosition.has_value())
	{
		this->previewPoint = info.worldPosition.value();
		if (this->polygon.size() < 4)
		{
			this->previewPolygon.resize(this->polygon.size() + 1);
			this->previewPolygon.back() = this->previewPoint;
		}
	}
	return false;
}

void DrawTool::reset()
{
	this->polygon.clear();
}

void DrawTool::overpaint(Canvas* canvas, QPainter* painter) const
{
	painter->setBrush(::polygonBrush);
	painter->setPen(::polygonPen);
	canvas->drawWorldPolygon(painter, this->previewPolygon);
	painter->setBrush(::pointBrush);
	painter->setPen(::pointPen);
	for (const glm::vec3& point : this->polygon)
	{
		canvas->drawWorldPoint(painter, point);
	}
	if (this->polygon.size() < 4)
	{
		canvas->drawWorldPoint(painter, this->previewPoint);
	}
}

void DrawTool::closeShape()
{
	QMessageBox::information(nullptr, "test", "close the polygon");
}