Context Data Feeds & Viewport Bounds Schema Reference

ctx.bars

An array of objects representing the historical market price feed loaded on the chart.

{
  open: 101.25,   // Open price
  high: 103.50,   // High price
  low: 99.80,     // Low price
  close: 102.10,   // Close price
  volume: 240500,   // volume units
  time: 1784931200 // Unix epoch in milliseconds
}

ctx.bounds

An object describing viewport boundaries and sizing metrics for the active price chart pane:

{
  chartW: 960,       // Pixel width of drawing area
  chartH: 480,       // Pixel height of drawing area
  startIndex: 45,    // Leftmost visible bar index
  endIndex: 125,     // Rightmost visible bar index
  numVisible: 80,    // Total visible bars
  candleSlot: 8,     // Width of each candle slot
  xOffset: 0         // Scroll offset in pixels
}

ctx.mouse

Real-time coordinates and action state of the mouse cursor over the canvas:

{
  x: 242.5,     // Pixel X relative to canvas
  y: 150.0,     // Pixel Y relative to canvas
  isDown: false, // Left mouse button is down
  clicked: false // Click action occurred
}

ctx.drawings

An array of active drawing tools placed on the chart.

// Shape of entries:
{
  id: "line_1",
  type: "trend_line",
  points: [ { barIndex: 50, price: 105.0 } ],
  style: { color: '#ff0000', width: 2 },
  locked: false
}

ctx.indicators

An array representing all standard active indicators configured on the chart.

{
  type: "rsi",
  params: { period: 14 },
  color: "#9c27b0",
  enabled: true,
  values: [ /* calculated numerical values */ ]
}

ctx.customScripts

Array of all loaded custom JavaScript indicator scripts:

{
  id: "script_0",
  name: "EMA Cross Over",
  code: "// script code strings",
  enabled: true
}