scichart
Version:
Fast WebGL JavaScript Charting Library and Framework
65 lines (64 loc) • 3.9 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.NumericCoordinateCalculator = void 0;
var CoordinateCalculatorBase_1 = require("./CoordinateCalculatorBase");
/**
* Provides an implementation of Numeric {@link CoordinateCalculatorBase | Coordinate Calculator} which transforms
* numeric data-values to pixel coordinates and vice versa.
* @remarks
* SciChart's {@link https://www.scichart.com/javascript-chart-features | JavaScript Charts} perform conversion operations between
* data-coordinates for all drawing and axis measurements.
*
* You can fetch a CoordinateCalculator instance by calling {@link AxisCore.getCurrentCoordinateCalculator}. This will return a unique calculator
* for the current draw pass.
*
* You can convert pixel to data-coordinates and back by using the following code:
* ```ts
* const axis: AxisCore;
* const calc = axis.getCurrentCoordinateCalculator();
*
* const pixel = calc.getCoordinate(1.23); // Gets the pixel coordinate for data-value 1.23
* const dataValue = cald.getDataValue(pixel); // Performs the inverse operation to get data-value
* ```
*
* Use the Coordinate calculators when drawing, placing markers, annotations or if you want to place a tooltip over the chart.
*/
var NumericCoordinateCalculator = /** @class */ (function (_super) {
__extends(NumericCoordinateCalculator, _super);
/**
* Creates an instance of NumericCoordinateCalculator
* @param webAssemblyContext The {@link TSciChart | SciChart 2D WebAssembly Context} or {@link TSciChart2D | SciChart 2D WebAssembly Context}
* containing native methods and access to our WebGL2 Engine and WebAssembly numerical methods
* @param viewportDimension The size of the associated {@link AxisCore | Axis} at the time of drawing
* @param visibleMin The {@link AxisCore.visibleRange}.min at the time of drawing
* @param visibleMax The {@link AxisCore.visibleRange}.max at the time of drawing
* @param offset A constant pixel offset used in coordinate calculations
* @param allowFastMath When true, calculate using 32-bit floating point values (faster, but less accurate)
*/
function NumericCoordinateCalculator(webAssemblyContext, viewportDimension, visibleMin, visibleMax, offset, allowFastMath) {
if (offset === void 0) { offset = 0; }
if (allowFastMath === void 0) { allowFastMath = false; }
var _this = _super.call(this, webAssemblyContext, viewportDimension, visibleMin, visibleMax, offset, false) || this;
_this.nativeCalculator = allowFastMath
? new webAssemblyContext.LinearCoordinateCalculatorSingle(_this.viewportDimension, _this.visibleMin, _this.visibleMax, -1, _this.offset)
: new webAssemblyContext.LinearCoordinateCalculatorDouble(_this.viewportDimension, _this.visibleMin, _this.visibleMax, -1, _this.offset);
return _this;
}
return NumericCoordinateCalculator;
}(CoordinateCalculatorBase_1.CoordinateCalculatorBase));
exports.NumericCoordinateCalculator = NumericCoordinateCalculator;