2 files changed, 136 insertions, 0 deletions
diff --git a/gauge.cpp b/gauge.cpp
new file mode 100644
index 0000000..9e47606
--- /dev/null
+++ b/gauge.cpp
@@ -0,0 +1,85 @@
+#include "gauge.h"
+
+Gauge::Gauge(QWidget *parent) : QWidget (parent) ,
+    m_gauge_percentage(0),
+    m_needle_horizontal_offset(0),
+    m_needle_origin(0,0),
+    m_start_angle(180),
+    m_end_angle(0)
+{
+    setMinimumHeight(32);
+    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+}
+
+void Gauge::setOrigin(int x,int y) //Set a real origin based on image if available, otherwise store desired value for later use.
+{
+    if(!m_needle.isNull())
+    {
+        m_draw_point = QPoint(x-m_needle_horizontal_offset-(m_needle.width()/2),y-m_needle.height());
+        m_needle_origin = QPoint(x,y);
+        update();
+    }
+    else
+    {
+        m_needle_origin = QPoint(x,y);
+    }
+}
+void Gauge::setOrigin(QPoint o) //Set a real origin based on image if available, otherwise store desired value for later use.
+{
+    if(!m_needle.isNull())
+    {
+        m_draw_point = QPoint(o.x()-m_needle_horizontal_offset-(m_needle.width()/2),o.y()-m_needle.height());
+        m_needle_origin = o;
+        update();
+    }
+    else
+    {
+        m_needle_origin = o;
+    }
+}
+//void Gauge::obtainLength()
+//{
+//    if(m_needle.isNull())return;
+
+//    if(m_needle.height() > m_needle.width())
+//        m_needle_length = m_needle.height();
+//    else
+//        m_needle_length = m_needle.width();
+//    update();
+//}
+
+void Gauge::setNeedleImage(QString path)
+{
+    m_needle.load(path);
+    //obtainLength();
+    update();
+}
+
+void Gauge::setEndAngle(qreal a)
+{
+    if(a > 0) m_end_angle = a - 360.0;
+    else m_end_angle = a;
+    update();
+}
+
+void Gauge::setStartAngle(qreal a)
+{
+    if(a < 0) m_start_angle = a + 360.0;
+    else m_start_angle = a;
+    update();
+}
+
+void Gauge::paintEvent(QPaintEvent *)
+{
+    if(m_needle.isNull())return;
+    QPainter p(this);
+    QTransform tran;
+    double angle = (DEFUALT_IMAGE_ANGLE - m_start_angle)-((m_end_angle-m_start_angle)/(100.0)*m_gauge_percentage);
+
+    tran.translate(m_needle_origin.x(),m_needle_origin.y());
+    tran.rotate(angle);
+    tran.translate(-m_needle_origin.x(),-m_needle_origin.y());
+
+    p.setTransform(tran);
+    p.drawPixmap(m_draw_point,m_needle);
+}
diff --git a/gauge.h b/gauge.h
new file mode 100644
index 0000000..7bb9133
--- /dev/null
+++ b/gauge.h
@@ -0,0 +1,51 @@
+/*
+ * JD 12/9/2022
+*/
+#ifndef GAUGE_H
+#define GAUGE_H
+
+#include <QWidget>
+#include <QPainter>
+#include <QString>
+#include <QPixmap>
+#include <QTransform>
+#include <QPixmap>
+#include <QFontMetrics>
+
+#define DEFUALT_IMAGE_ANGLE 90
+
+class Gauge : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit Gauge(QWidget *parent = nullptr);
+    void paintEvent(QPaintEvent *);
+
+signals:
+
+public slots:
+    void setNeedleImage(QPixmap p) {m_needle = p; update();}
+    void setNeedleImage(QString path);
+    //void obtainLength();
+    void setOrigin(int x,int y);
+    void setOrigin(QPoint o);
+    void setHorizontalOffset(int o) {m_needle_horizontal_offset = o; update();}
+    void setStartAngle(qreal a);
+    void setEndAngle(qreal a);
+    void setGaugePercentage(qreal p) {m_gauge_percentage = p; update();}
+
+
+protected:
+
+private:
+    //double m_needle_length;
+    double m_gauge_percentage;
+    int m_needle_horizontal_offset; //Use if needle isn't centered within the image.
+    QPoint m_needle_origin;
+    QPoint m_draw_point;
+    QPixmap m_needle;
+    qreal m_start_angle;
+    qreal m_end_angle;
+};
+
+#endif // GAUGE_H