goldenChat base source add

2026-05-23 15:11:48 +09:00
commit a4ea7762b5
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+/*
+ * SPDX-License-Identifier: MIT
+ */
+package ta4jexamples.charting.renderer;
+
+import org.jfree.chart.renderer.xy.CandlestickRenderer;
+import org.jfree.data.xy.OHLCDataset;
+import org.jfree.data.xy.XYDataset;
+
+import java.awt.*;
+
+/**
+ * Custom candlestick renderer that provides distinct colors for up and down
+ * candles.
+ *
+ * <p>
+ * This renderer extends the standard JFreeChart CandlestickRenderer to provide
+ * custom coloring based on whether a candle represents a price increase (up) or
+ * decrease (down). Up candles are colored green, down candles are colored red.
+ * </p>
+ *
+ * @see CandlestickRenderer
+ * @since 0.19
+ */
+public class BaseCandleStickRenderer extends CandlestickRenderer {
+
+    /**
+     * Color for up candles (close > open). Matches TradingView's default bullish
+     * candle color.
+     *
+     * @since 0.19
+     */
+    public static final Color DEFAULT_UP_COLOR = new Color(0x26A69A);
+
+    /**
+     * Color for down candles (close {@literal <} open). Matches TradingView's
+     * default bearish candle color.
+     *
+     * @since 0.19
+     */
+    public static final Color DEFAULT_DOWN_COLOR = new Color(0xEF5350);
+
+    /**
+     * Returns the paint color for the specified item based on whether it's an up or
+     * down candle.
+     *
+     * @param row    the row (series) index
+     * @param column the column (item) index
+     * @return the paint color for the item
+     * @since 0.19
+     */
+    @Override
+    public Paint getItemPaint(int row, int column) {
+        XYDataset dataset = getPlot().getDataset();
+        if (!(dataset instanceof OHLCDataset highLowData)) {
+            return super.getItemPaint(row, column);
+        }
+
+        // Check for valid indices
+        if (row < 0 || row >= highLowData.getSeriesCount() || column < 0 || column >= highLowData.getItemCount(row)) {
+            return new Color(128, 128, 128); // Return neutral gray for invalid indices
+        }
+
+        Number yOpen = highLowData.getOpen(row, column);
+        Number yClose = highLowData.getClose(row, column);
+
+        if (yOpen == null || yClose == null) {
+            return super.getItemPaint(row, column);
+        }
+
+        boolean isUpCandle = yClose.doubleValue() > yOpen.doubleValue();
+
+        return isUpCandle ? DEFAULT_UP_COLOR : DEFAULT_DOWN_COLOR;
+    }
+}