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sclass TradingCandlePainter extends AbstractTickerPainter {
  settable L<TradingCandle> candles;
  
  int spikeWidth = 1;
  Color shortColor = java.awt.Color.blue;
  Color longColor = java.awt.Color.yellow;
  
  BufferedImage render() {
    var run = new TradingRun(candles);
    verticalRange(doubleRange(run.min(), run.max()));
    horizontalRange(doubleRange(run.startTime().unixDate(), run.endTime().unixDate()));
    
    // Make black image
    var img = blackImage(w, h);
    var g = img.createGraphics();
    
    drawPercentLines(g);

    // Draw candles
    
    var nCandles = l(candles);
    
    for i to nCandles: {
      var candle = candles.get(i);
      var x1 = xRange().start()+doubleRatio(i, nCandles)*xRange().length();
      var x2 = xRange().start()+doubleRatio(i+1, nCandles)*xRange().length();
      x2 = blend(x1, x2, 0.75);
      var xCenter = avg(x1, x2);
      var y1 = yToScreen(candle.max());
      var y2 = yToScreen(candle.min());
      var yStart = yToScreen(candle.start());
      var yEnd = yToScreen(candle.end());
      
      // draw "spikes"
      var r = doubleRectFromPoints(xCenter, y1, xCenter+spikeWidth, y2);
      fillRect(g, growRectBottom(1, toRect_round(r)), candle.color());
      
      // draw candle body
      r = doubleRectFromPoints(x1, min(yStart, yEnd), x2, max(yStart, yEnd));
      fillRect(g, growRectBottom(1, toRect_round(r)), candle.color());
    }
    
    drawPositions(g);
    
    ret img;
  }
}