From 9f33eb49ccb7fa8fb80f00865819beb499e70025 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sat, 29 Dec 2018 14:32:13 +0100
Subject: Zoom canvas using scroll-wheel.

---
 src/luascript.cc    | 33 ---------------------------------
 src/mainwindow.cc   |  9 +++++++++
 src/outputwindow.cc | 21 ++++++++++++++++++---
 src/outputwindow.h  |  8 ++++++--
 4 files changed, 33 insertions(+), 38 deletions(-)

diff --git a/src/luascript.cc b/src/luascript.cc
index 0619228..7a84d1f 100644
--- a/src/luascript.cc
+++ b/src/luascript.cc
@@ -197,38 +197,6 @@ static int _sleep(lua_State *L)
 	return 0;
 }
 
-static int _scale(lua_State *L)
-{
-	//Pracro::checkParameters(L,
-	//                        Pracro::T_STRING,
-	//                        Pracro::T_END);
-
-	double x = lua_tonumber(L, lua_gettop(L));
-
-	printf("scale %f\n", x);
-
-	lua_getglobal(L, GLOBAL_POINTER);
-	LUAScript *lua = (LUAScript*)lua_touserdata(L, lua_gettop(L));
-
-	if(!lua)
-	{
-		lua_pushstring(L, "No LUA pointer!");
-		lua_error(L);
-		return 1;
-	}
-
-	if(lua->lua_stop)
-	{
-		printf("stopping...\n");
-		lua_pushstring(L, "stop");
-		lua_error(L);
-	}
-
-	lua->out.setScale(x);
-
-	return 0;
-}
-
 static int _colour(lua_State *L)
 {
 	//Pracro::checkParameters(L,
@@ -417,7 +385,6 @@ void LUAScript::init()
 	lua_register(L, "forward", _forward);
 	lua_register(L, "turn", _turn);
 	lua_register(L, "speed", _speed);
-	lua_register(L, "scale", _scale);
 	lua_register(L, "reset", _reset);
 	lua_register(L, "colour", _colour);
 	lua_register(L, "loadpen", _loadpen);
diff --git a/src/mainwindow.cc b/src/mainwindow.cc
index 7e08c46..e52b9f3 100644
--- a/src/mainwindow.cc
+++ b/src/mainwindow.cc
@@ -150,11 +150,16 @@ void MainWindow::loadSettings()
 	QByteArray geometry;
 
 	QSettings settings;
+
 	settings.beginGroup("MainWindow");
 	state = settings.value("state").toByteArray();
 	geometry = settings.value("geometry").toByteArray();
 	settings.endGroup();
 
+	settings.beginGroup("Canvas");
+	out->setScale(settings.value("scale", 2.0).toDouble());
+	settings.endGroup();
+
 	restoreGeometry(geometry);
 	restoreState(state);
 }
@@ -167,6 +172,10 @@ void MainWindow::saveSettings()
 	settings.setValue("state", saveState());
 	settings.setValue("geometry", saveGeometry());
 	settings.endGroup();
+
+	settings.beginGroup("Canvas");
+	settings.setValue("scale", out->getScale());
+	settings.endGroup();
 }
 
 bool MainWindow::checkDirty()
diff --git a/src/outputwindow.cc b/src/outputwindow.cc
index 815da8c..b7b1a51 100644
--- a/src/outputwindow.cc
+++ b/src/outputwindow.cc
@@ -29,6 +29,7 @@
 
 #include <QPixmap>
 #include <QPainter>
+#include <QWheelEvent>
 
 #include <math.h>
 
@@ -72,7 +73,11 @@ void OutputWindow::loadPen(QString file)
 void OutputWindow::setScale(double s)
 {
 	scale = s;
-	sem.acquire();
+}
+
+double OutputWindow::getScale() const
+{
+	return scale;
 }
 
 void OutputWindow::setSpeed(int s)
@@ -107,11 +112,22 @@ void OutputWindow::timeout()
 	timer.start(25);
 }
 
+
+void OutputWindow::wheelEvent(QWheelEvent* event)
+{
+	double delta = event->delta() / 120.0 * scale;
+	scale += delta / 10.0;
+	printf("%f\n", scale);
+	if(scale < 0.3)
+	{
+		scale = 0.3;
+	}
+}
+
 void OutputWindow::paintEvent(QPaintEvent *)
 {
 	//sem.acquire();
 	QPainter p(this);
-	//QTransform tp; tp.scale(3, 3); p.setTransform(tp);
 
 	if(loadpen)
 	{
@@ -180,7 +196,6 @@ void OutputWindow::paintEvent(QPaintEvent *)
 
 void OutputWindow::reset()
 {
-	scale = 2.0;
 	speed = 50;
 	penfile = "gfx/kaiman.png";
 	loadpen = true;
diff --git a/src/outputwindow.h b/src/outputwindow.h
index 5e91f71..fc63a44 100644
--- a/src/outputwindow.h
+++ b/src/outputwindow.h
@@ -47,7 +47,10 @@ public:
 	void stopScript();
 
 	void setSpeed(int s);
+
 	void setScale(double s);
+	double getScale() const;
+
 	void setColour(int r, int g, int b, int a);
 
 	void loadPen(QString file);
@@ -60,7 +63,8 @@ public slots:
 	void reset();
 
 protected:
-	void paintEvent(QPaintEvent * event);
+	void wheelEvent(QWheelEvent* event);
+	void paintEvent(QPaintEvent* event);
 
 private:
 	class ColLine
@@ -83,5 +87,5 @@ private:
 	volatile bool loadpen;
 	QString penfile;
 
-	volatile float scale;
+	volatile float scale{2.0f};
 };
-- 
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