From 1bcef63d3dae40cd749bd190409509aecc0ef365 Mon Sep 17 00:00:00 2001
From: Ivan Pelipenko <peri4ko@yandex.ru>
Date: Tue, 15 Sep 2020 16:18:36 +0300
Subject: [PATCH] Graphic tracing improvements

---
 libs/graphic/graphic.cpp | 61 +++++++++++++++++-----------------------
 libs/graphic/graphic.h   |  5 +++-
 2 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/libs/graphic/graphic.cpp b/libs/graphic/graphic.cpp
index 2d0954b..7a6b00b 100644
--- a/libs/graphic/graphic.cpp
+++ b/libs/graphic/graphic.cpp
@@ -110,7 +110,7 @@ Graphic::Graphic(QWidget * parent): QFrame(parent), canvas(0), line_x_min(this),
 	text_color = palette().color(QPalette::WindowText);
 	grid_pen = QPen(palette().color(QPalette::Disabled, QPalette::WindowText), 0., Qt::DotLine);
 	graphics.append(GraphicType());
-	curGraphic = 0;
+	curGraphic = curTrace = 0;
 	selpen = palette().color(QPalette::WindowText);
 	selpen.setStyle(Qt::DashLine);
 	back_color = palette().color(QPalette::Base);
@@ -1156,44 +1156,35 @@ void Graphic::drawGuides() {
 	QPointF rpos = canvas2real(apos);
 	QString str;
 	str = pointCoords(rpos) + fp_size;
+	auto trace_func = [&](bool on_x, double cursor) {
+		if (curTrace >= 0 && curTrace < graphics.size()) {
+			if (graphics[curTrace].visible) {
+				QPolygonF & pol(pause_ ? graphics[curTrace].polyline_pause : graphics[curTrace].polyline);
+				double min_dist = -1, dist = 0.;
+				int index = -1;
+				for (int i = 0; i < pol.size(); ++i) {
+					if (!selrect.contains(pol[i])) continue;
+					dist = qAbs<double>((on_x ? pol[i].x() : pol[i].y()) - cursor);
+					if (min_dist > dist || min_dist < 0) {
+						min_dist = dist;
+						index = i;
+					}
+				}
+				if (index >= 0) {
+					rpos = pol[index];
+					apos = real2canvas(rpos).toPoint();
+					str = pointCoords(pol[index]) + fp_size;
+					emit graphicTraceEvent(curTrace, rpos);
+				}
+			}
+		}
+	};
 	switch (floating_axis_type) {
 	case TraceX:
-		if (curGraphic >= 0 && curGraphic < graphics.size()) {
-			QPolygonF & pol(pause_ ? graphics[curGraphic].polyline_pause : graphics[curGraphic].polyline);
-			double cursor = rpos.x(), min_dist = -1, dist = 0.;
-			int index = -1;
-			for (int i = 0; i < pol.size(); ++i) {
-				dist = qAbs<double>(pol[i].x() - cursor);
-				if (min_dist > dist || min_dist < 0) {
-					min_dist = dist;
-					index = i;
-				}
-			}
-			if (index >= 0) {
-				rpos = pol[index];
-				apos = real2canvas(rpos).toPoint();
-				str = pointCoords(pol[index]) + fp_size;
-			}
-		}
+		trace_func(true, rpos.x());
 		break;
 	case TraceY:
-		if (curGraphic >= 0 && curGraphic < graphics.size()) {
-			QPolygonF & pol(pause_ ? graphics[curGraphic].polyline_pause : graphics[curGraphic].polyline);
-			double cursor = rpos.y(), min_dist = -1, dist = 0.;
-			int index = -1;
-			for (int i = 0; i < pol.size(); ++i) {
-				dist = qAbs<double>(pol[i].y() - cursor);
-				if (min_dist > dist || min_dist < 0) {
-					min_dist = dist;
-					index = i;
-				}
-			}
-			if (index >= 0) {
-				rpos = pol[index];
-				apos = real2canvas(rpos).toPoint();
-				str = pointCoords(pol[index]) + fp_size;
-			}
-		}
+		trace_func(false, rpos.y());
 		break;
 	default: break;
 	}
diff --git a/libs/graphic/graphic.h b/libs/graphic/graphic.h
index 609ad7a..25d0800 100644
--- a/libs/graphic/graphic.h
+++ b/libs/graphic/graphic.h
@@ -182,6 +182,7 @@ public:
 	bool gesturesNavigation() const {return gestures;}
 	bool isAutofitted() const {return isFit;}
 	int currentGraphic() const {return curGraphic;}
+	int currentTraceGraphic() const {return curTrace;}
 	int graphicsCount() const {return graphics.size();}
 	Graphic::Buttons buttons() const {return buttons_;}
 	Graphic::Alignment buttonsPosition() const {return align;}
@@ -317,6 +318,7 @@ public slots:
 	void update(bool force = false);
 	void updateGraphics() {findGraphicsRect(); update();}
 	void setCurrentGraphic(int arg) {if (arg < 0 || arg >= graphics.size()) return; curGraphic = arg;}
+	void setTraceGraphic(int arg) {if (arg < 0 || arg >= graphics.size()) return; curTrace = arg;}
 	void setGraphicsCount(int arg, bool update = true);
 	void removeGraphic(int arg, bool update = true);
 
@@ -371,7 +373,7 @@ protected:
 	QPen grid_pen, selpen;
 	QColor back_color, text_color;
 	QVector<GraphicType> graphics;
-	int curGraphic;
+	int curGraphic, curTrace;
 	GraphicAction curaction, prevaction;
 	QRectF grect, selrect, limit_, def_rect;
 	QRect margins_;
@@ -437,6 +439,7 @@ signals:
 	void graphicMousePressEvent(QPointF point, int buttons);
 	void graphicMouseReleaseEvent(QPointF point, int buttons);
 	void graphicWheelEvent(QPointF point, int delta);
+	void graphicTraceEvent(int graphic, QPointF point);
 	void closeRequest(QWidget * );
 	void cleared();
 	void visualRectChanged();