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chart-dca-2.js
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chart-dca-2.js
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// chart-dca.js
import Overlay from "./overlay"
import { renderLineHorizontal } from "../../renderer/line";
import { renderTextBG } from "../../renderer/text";
const defaults = {
colour: "#0d872d88", //colour for entry points
width: 1,
dash: [1, 0],
fundsUSDT: 50, // default value for fundsUSDT
gaps: 0.005, // default value for gaps (0.5%)
takeProfit: 0.01, // default value for take profit (1%)
numberOfGrids: 5, // default value for number of grids
profitColour: "#FF000088", // colour for take profit line
};
function drawText(ctx, txt, x, y, w, theme) {
let options = {
fontSize: theme.fontSize * 1.05,
fontWeight: theme.fontWeight,
fontFamily: theme.fontFamily,
txtCol: theme.colourCursor,
bakCol: theme.colourCursorBG,
paddingTop: 2,
paddingBottom: 2,
paddingLeft: 3,
paddingRight: 3,
width: w
},
height = options.fontSize + options.paddingTop + options.paddingBottom,
yPos = y - (height * 0.5);
ctx.save()
ctx.fillStyle = options.bakCol
ctx.fillRect(x, yPos, w, height)
renderTextBG(ctx, `${txt}`, x, yPos , options)
ctx.restore()
}
export default class chartDCA extends Overlay {
constructor(target, xAxis=false, yAxis=false, theme, parent, params) {
super(target, xAxis, yAxis, theme, parent, params)
// this.params = {
// fundsUSDT: defaults.fundsUSDT,
// gaps: defaults.gaps,
// takeProfit: defaults.takeProfit,
// numberOfGrids: defaults.numberOfGrids,
// ...params,
// };
// add the overlay to the Scale (yAxis)
console.log("DCA")
const dca = {class: scaleDCA, fixed: true, required: false}
if (this.core.config?.dca === true)
this.scaleOverly = this.chart.scale.addOverlay("dca", dca)
}
// Overlay position is fixed and won't pan / scroll with the chart
set position(p) { this.target.setPosition(0, 0) }
draw(data = this.core.state.data.chart.data) {
if (this.core.config?.dca !== true) return
if (!super.mustUpdate()) return
// let firstPrice = data[0][4];
let lastPrice = data[data.length - 1][4];
// clear the overlay canvas
this.scene.clear()
let txt, x, y;
let r = this.scene.width
let opts = {}
const theme = {...this.theme.yAxis}
const ctx = this.scene.context
theme.colourCursorBG = this.theme?.dca?.colour || defaults.colour
// Default rendering settings
ctx.save();
ctx.strokeStyle = this.theme?.dca?.colour || defaults.colour;
ctx.lineWidth = this.theme?.dca?.width || defaults.width;
ctx.setLineDash(this.theme?.dca?.dash || defaults.dash);
// Current Price
y = this.yAxis.yPos(lastPrice)
renderLineHorizontal(ctx, y, 0, r, opts)
// Entry points for the grid
for (let i = 0; i < defaults.numberOfGrids; i++) {
let entryPrice = lastPrice * Math.pow(1 - defaults.gaps, i + 1);
y = this.yAxis.yPos(entryPrice);
renderLineHorizontal(ctx, y, 0, r, opts);
// fundsUSDT
let txt2 = `${defaults.fundsUSDT} USDT -`;
let w = ctx.measureText(txt2).width + 70;
x = (this.theme.yAxis.location === "left") ? 0 : r - w;
drawText(ctx, txt2, x, y, w, theme);
}
// Take Profit line
let takeProfitPrice = lastPrice * (1 + defaults.takeProfit);
y = this.yAxis.yPos(takeProfitPrice);
ctx.strokeStyle = defaults.profitColour; // Colour for take profit line
// ctx.setLineDash([]);
renderLineHorizontal(ctx, y, 0, r, opts);
// // Custom value fundsUSDT for take profit
// let txt3 = `${defaults.fundsUSDT} USDT -`;
// let w = ctx.measureText(txt3).width + 70;
// x = (defaults.yAxis.location === "left") ? 0 : r - w;
// drawText(ctx, txt3, x, y, w, theme);
// Calculate and display profit for take profit line
let profitText = `Take Profit: ${defaults.takeProfit *100} %`;
// Display the profit text
let wProfitText = ctx.measureText(profitText).width + 80;
// ctx.strokeStyle = defaults.profitColour; // Colour for take profit line
x = (this.theme.yAxis.location === "left") ? 0 : r - wProfitText;
drawText(ctx, profitText, x, y, wProfitText, theme);
ctx.restore()
super.updated()
if ("dca" in this.chart.scale.overlays) {
this.chart.scale.overlays.dca.instance.setRefresh()
this.chart.scale.overlays.dca.instance.scaleDraw()
}
}
}
class scaleDCA extends Overlay {
constructor(target, xAxis=false, yAxis=false, theme, parent, params) {
super(target, xAxis, yAxis, theme, parent, params)
this.viewport = target.viewport
}
// Overlay position is fixed and won't pan / scroll with the chart
set position(p) { this.target.setPosition(0, 0) }
draw() {}
//range=this.core.range pointers to stats
scaleDraw(data = this.core.state.data.chart.data) {
if (!super.mustUpdate()) return
this.scene.clear()
let txt, x, y, w;
let lastPrice = data[data.length - 1][4];
const theme = {...this.theme.yAxis}
const ctx = this.scene.context
theme.colourCursorBG = this.theme?.dca?.colour || defaults.colour
// Last Price
txt = this.chart.Scale.nicePrice(lastPrice)
x = 1
y = this.yAxis.yPos(lastPrice) + 1
w = this.viewport.width
drawText(ctx, txt, x, y, w, theme)
// Other entries
for (let i = 0; i < defaults.numberOfGrids; i++) {
let entryPrice = lastPrice * Math.pow(1 - defaults.gaps, i + 1);
y = this.yAxis.yPos(entryPrice) + 1;
txt = this.chart.Scale.nicePrice(entryPrice)
drawText(ctx, txt, x, y, w, theme)
}
super.updated()
}
}