Calibrator: Display chessy background at the editor

Author: Wohlstand

PlayableCalibrator/image_calibration/image_calibrator.cpp

@@ -25,6 +25,8 @@ ImageCalibrator::ImageCalibrator(Calibration *conf, QWidget *parent) :
     Q_ASSERT(conf);
     ui->setupUi(this);
 
+    ui->preview->setBgChess(true);
+
     ui->preview->setAllowScroll(true);
     QObject::connect(ui->preview, &FrameTuneScene::delta,
                      this, [this](Qt::MouseButton button, int deltaX, int deltaY)->void

PlayableCalibrator/main/frame_tune_scene.cpp

@@ -735,6 +735,13 @@ void FrameTuneScene::setBgColor(QColor clr)
         repaint();
 }
 
+void FrameTuneScene::setBgChess(bool chess)
+{
+    m_backgroundChess = chess;
+    if(!m_blockRepaint)
+        repaint();
+}
+
 void FrameTuneScene::setBlockRepaint(bool en)
 {
     m_blockRepaint = en;
@@ -953,6 +960,26 @@ void FrameTuneScene::paintEvent(QPaintEvent * /*event*/)
     QPainter painter(this);
     painter.fillRect(rect(), QBrush(m_bgColor));
 
+    if(m_backgroundChess)
+    {
+        painter.save();
+        auto r = rect();
+        int gridSize = 8;
+        int w = r.width() / gridSize;
+        int h = r.height() / gridSize;
+
+        for(int y = 0; y < h; ++y)
+        {
+            for(int x = 0; x < w; ++x)
+            {
+                QColor colour = ((x + (y % 2)) % 2) ? Qt::darkGray : Qt::gray;
+                painter.fillRect(x * gridSize, y * gridSize, gridSize, gridSize, QBrush(colour));
+            }
+        }
+
+        painter.restore();
+    }
+
     auto canvas = rect();
     auto c = canvas.center() + (curScrollOffset() * m_zoom);
     QRect dst;
@@ -1129,15 +1156,16 @@ void FrameTuneScene::paintEvent(QPaintEvent * /*event*/)
 
         if(m_drawGrid && m_drawMetaData)
         {
+            QColor gridColour = m_backgroundChess ? Qt::black : Qt::gray;
             painter.save();
-            painter.setPen(QPen(Qt::gray, 1));
+            painter.setPen(QPen(gridColour, 1));
             painter.setBrush(Qt::transparent);
             painter.drawRect(dst);
             painter.restore();
 
             painter.save();
             painter.setOpacity(5.0);
-            painter.setPen(QPen(Qt::gray, 1, Qt::DotLine));
+            painter.setPen(QPen(gridColour, 1, Qt::DotLine));
 
             if(m_zoom > 3.0)
             {
@@ -1173,6 +1201,14 @@ void FrameTuneScene::paintEvent(QPaintEvent * /*event*/)
         painter.restore();
     }
 
+    if(!m_curTool.isNull())
+    {
+        QPoint globalCursorPos = mapFromGlobal(QCursor::pos());
+        painter.save();
+        m_curTool->drawPreview(painter, dst, m_zoom, mapToImg(globalCursorPos));
+        painter.restore();
+    }
+
     if(m_drawMetaData)
     {
         painter.save();
@@ -1248,14 +1284,6 @@ void FrameTuneScene::paintEvent(QPaintEvent * /*event*/)
         }
         painter.restore();
     }
-
-    if(!m_curTool.isNull())
-    {
-        QPoint globalCursorPos = mapFromGlobal(QCursor::pos());
-        painter.save();
-        m_curTool->drawPreview(painter, dst, m_zoom, mapToImg(globalCursorPos));
-        painter.restore();
-    }
 }
 
 void FrameTuneScene::wheelEvent(QWheelEvent *event)

PlayableCalibrator/main/frame_tune_scene.h

@@ -52,6 +52,7 @@ class FrameTuneScene : public QFrame
     double  m_refOpacity = 0.5;
 
     QColor  m_bgColor;
+    bool    m_backgroundChess = false;
 
     int     m_hitboxWidth = 0;
     int     m_hitboxHeight = 0;
@@ -102,6 +103,7 @@ class FrameTuneScene : public QFrame
     void set2pixDrawMode(bool en);
     void resetScroll();
     void setBgColor(QColor clr);
+    void setBgChess(bool chess);
 
     void setBlockRepaint(bool en);