dow/firmware/dow.cpp

#include "dow.h"

bool firstRender = true;
uint16_t reRenders = 0;
int16_t tbx, tby;
uint16_t tbw, tbh;

const GFXfont* DOW_FONTS[] = {
    &FreeSans12pt7b,
    &FreeSans24pt7b,
    &FiraCode_Bold62pt7b,
    &FreeSans9pt7b
};

void dow_apply_font(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, uint8_t font)
{
  if (font > 3) {
    font = 3;
  }

  display.setFont(DOW_FONTS[font]);
}

void dow_get_text_item_rect(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item, bool forText, int *rx, int *ry, int *rw, int *rh)
{
  dow_apply_font(display, item->font);
  display.getTextBounds(item->contents, 0, 0, &tbx, &tby, &tbw, &tbh);

  int x = item->x;
  int y = item->y;
  int w = tbw;
  int h = tbh;

  switch (item->horizontalAlign)
  {
  case ITEM_ALIGN_CENTER:
  {
    x -= round((double)w / 2);
    break;
  }

  case ITEM_ALIGN_END:
  {
    x -= w;
    break;
  }
  }

  switch (item->verticalAlign)
  {
  case ITEM_ALIGN_CENTER:
  {
    y += round((double)h / 2);
    break;
  }

  case ITEM_ALIGN_START:
  {
    y += h;
    break;
  }
  }

  if (!forText)
  {
    display.getTextBounds(item->contents, x, y, &tbx, &tby, &tbw, &tbh);

    *rx = tbx;
    *ry = tby;
    *rw = tbw;
    *rh = tbh;

    return;
  }

  *rx = x;
  *ry = y;
  *rw = w;
  *rh = h;
}

void dow_get_item_rect(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item, int *rx, int *ry, int *rw, int *rh)
{
  switch (item->type)
  {
  case ITEM_TYPE_TEXT:
  {
    dow_get_text_item_rect(display, item, false, rx, ry, rw, rh);
    break;
  }
  case ITEM_TYPE_LINE:
  {
    int minX = min(item->x, item->x2);
    int minY = min(item->y, item->y2);
    int maxX = max(item->x, item->x2);
    int maxY = max(item->y, item->y2);
    *rx = minX;
    *ry = minY;
    *rw = (maxX - minX);
    *rh = (maxY - minY);
    break;
  }
  case ITEM_TYPE_CIRCLE:
  {
    *rx = item->x - item->radius;
    *ry = item->y - item->radius;
    *rw = item->radius * 2;
    *rh = item->radius * 2;
    break;
  }
  case ITEM_TYPE_CIRCLE_FILL:
  {
    *rx = item->x - item->radius;
    *ry = item->y - item->radius;
    *rw = item->radius * 2;
    *rh = item->radius * 2;
    break;
  }
  case ITEM_TYPE_RECT:
  {
    *rx = item->x;
    *ry = item->y;
    *rw = item->x2;
    *rh = item->y2;
    break;
  }
  case ITEM_TYPE_RECT_FILL:
  {
    *rx = item->x;
    *ry = item->y;
    *rw = item->x2;
    *rh = item->y2;
    break;
  }
  }
}

void dow_render_text_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  int x, y, w, h;

  dow_get_text_item_rect(display, item, true, &x, &y, &w, &h);

  display.setCursor(x, y);
  display.print(item->contents);
}

void dow_render_rectangle_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  display.drawRect(item->x, item->y, item->x2, item->y2, GxEPD_BLACK);
}

void dow_render_filled_rectangle_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  display.fillRect(item->x, item->y, item->x2, item->y2, GxEPD_BLACK);
}

void dow_render_circle_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  display.drawCircle(item->x, item->y, item->radius, GxEPD_BLACK);
}

void dow_render_filled_circle_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  display.fillCircle(item->x, item->y, item->radius, GxEPD_BLACK);
}

void dow_render_line_item(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, dow_item_t *item)
{
  display.drawLine(item->x, item->y, item->x2, item->y2, GxEPD_BLACK);
}

void dow_render(GxEPD2_BW<GxEPD2_583_GDEQ0583T31, GxEPD2_583_GDEQ0583T31::HEIGHT> &display, std::vector<dow_item_t> &data)
{
  bool needsFullRender = reRenders > 5*60*6;

  if (needsFullRender || firstRender)
  {
    display.setFullWindow();
    display.setRotation(0);
    display.setTextColor(GxEPD_BLACK);
    display.firstPage();

    reRenders = 0;
    firstRender = false;
  }
  else
  {
    display.setPartialWindow(0, 0, display.width(), display.height());
    display.setRotation(0);
    display.firstPage();

    reRenders++;
  }

  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setTextColor(GxEPD_BLACK);

    for (int i = 0; i < data.size(); i++)
    {
      dow_item_t *item = &data[i];

      switch (item->type)
      {
      case ITEM_TYPE_TEXT:
      {
        dow_render_text_item(display, item);
        break;
      }
      case ITEM_TYPE_CIRCLE:
      {
        dow_render_circle_item(display, item);
        break;
      }
      case ITEM_TYPE_CIRCLE_FILL:
      {
        dow_render_filled_circle_item(display, item);
        break;
      }
      case ITEM_TYPE_RECT:
      {
        dow_render_rectangle_item(display, item);
        break;
      }
      case ITEM_TYPE_RECT_FILL:
      {
        dow_render_filled_rectangle_item(display, item);
        break;
      }
      case ITEM_TYPE_LINE:
      {
        dow_render_line_item(display, item);
        break;
      }
      }

      /*
      DEBUG: Draw bounding box
      int x1, y1, w1, h1;
      dow_get_text_item_rect(display, item, false, &x1, &y1, &w1, &h1);
      display.drawRect(x1, y1, w1, h1, GxEPD_BLACK);
      */
    }
  } while (display.nextPage());
}