git.mar77i.info Git - bigintmandel/blob - mandellabel.cpp

   1
   2 // mandellabel.cpp
   3
   4 #include <QPainter>
   5
   6 #include "mandellabel.h"
   7 #include "menubar.h"
   8 #include "qevent.h"
   9
  10 MandelLabel::MandelLabel(BigintMandelWidget *parent)
  11 :   QLabel(parent),
  12     settings(parent->get_settings()),
  13     menu_bar(parent->get_menu_bar()),
  14     draw_progress(-1),
  15     zoom_rect_center(-1, -1) {
  16     setMouseTracking(true);
  17 }
  18
  19 static inline QRect get_rect(QSize size, QPoint pos, int zoom_factor) {
  20     QSize scaled_size(size.width() / zoom_factor, size.height() / zoom_factor);
  21     return QRect(
  22         QPoint(
  23             pos.x() - scaled_size.width() / 2,
  24             pos.y() - scaled_size.height() / 2
  25         ),
  26         scaled_size
  27     );
  28 }
  29
  30 void MandelLabel::paintEvent(QPaintEvent *event) {
  31     QPixmap pixmap;
  32     QPainter qp;
  33     int zoom_factor = menu_bar->get_zoom_factor();
  34     bool draw_zoom_rect = (
  35         zoom_factor != -1
  36         && zoom_rect_center.x() != -1
  37         && zoom_rect_center.y() != -1
  38     );
  39     pixmap = settings->get_pixmap();
  40     if (draw_progress != -1 || draw_zoom_rect)
  41         qp.begin(&pixmap);
  42     if (draw_progress != -1) {
  43         qp.setPen(Qt::GlobalColor::gray);
  44         qp.drawLine(0, draw_progress, pixmap.width() - 1, draw_progress);
  45     }
  46     if (draw_zoom_rect) {
  47         qp.setPen(Qt::GlobalColor::gray);
  48         qp.drawRect(
  49             get_rect(
  50                 pixmap.size(),
  51                 zoom_rect_center,
  52                 zoom_factor
  53             )
  54         );
  55     }
  56     if (draw_progress != -1 || draw_zoom_rect)
  57         qp.end();
  58     resize(pixmap.size());
  59     setPixmap(pixmap);
  60     QLabel::paintEvent(event);
  61 }
  62
  63 void MandelLabel::leaveEvent(QEvent *event) {
  64     zoom_rect_center = QPoint(-1, -1);
  65 }
  66
  67 void MandelLabel::mouseMoveEvent(QMouseEvent *event) {
  68     zoom_rect_center = event->pos();
  69 }