Qt: Implement GC TAS input window

Source/Core/DolphinQt2/TAS/StickWidget.cpp

@@ -0,0 +1,82 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt2/TAS/StickWidget.h"
+#include "Common/CommonTypes.h"
+#include "InputCommon/GCPadStatus.h"
+
+#include <QMouseEvent>
+#include <QPainter>
+
+#include <algorithm>
+
+StickWidget::StickWidget(QWidget* parent, u16 max_x, u16 max_y) : QWidget(parent)
+{
+  m_max_x = max_x;
+  m_max_y = max_y;
+  m_x = 0;
+  m_y = 0;
+
+  setMouseTracking(false);
+}
+
+void StickWidget::SetX(u16 x)
+{
+  m_x = std::min(m_max_x, x);
+
+  update();
+}
+
+void StickWidget::SetY(u16 y)
+{
+  m_y = std::min(m_max_y, y);
+
+  update();
+}
+
+void StickWidget::paintEvent(QPaintEvent* event)
+{
+  QPainter painter(this);
+
+  painter.setBrush(Qt::white);
+  painter.drawEllipse(0, 0, width() - 1, height() - 1);
+
+  painter.drawLine(0, height() / 2, width(), height() / 2);
+  painter.drawLine(width() / 2, 0, width() / 2, height());
+
+  // convert from value space to widget space
+  u16 x = (m_x * width()) / m_max_x;
+  u16 y = height() - (m_y * height()) / m_max_y;
+
+  painter.drawLine(width() / 2, height() / 2, x, y);
+
+  painter.setBrush(Qt::blue);
+  int wh_avg = (width() + height()) / 2;
+  int radius = wh_avg / 30;
+  painter.drawEllipse(x - radius, y - radius, radius * 2, radius * 2);
+}
+
+void StickWidget::mousePressEvent(QMouseEvent* event)
+{
+  handleMouseEvent(event);
+}
+
+void StickWidget::mouseMoveEvent(QMouseEvent* event)
+{
+  handleMouseEvent(event);
+}
+
+void StickWidget::handleMouseEvent(QMouseEvent* event)
+{
+  // convert from widget space to value space
+  int new_x = ((int)event->x() * m_max_x) / width();
+  int new_y = m_max_y - ((int)event->y() * m_max_y) / height();
+
+  m_x = std::max(0, std::min((int)m_max_x, new_x));
+  m_y = std::max(0, std::min((int)m_max_y, new_y));
+
+  emit ChangedX(m_x);
+  emit ChangedY(m_y);
+  update();
+}