How to use Leverage in PineScript
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © RingsCherrY

//@version=5
leverage = input.int(2,title='Leverage',minval = 1, maxval = 100 ,step = 1)

// As the margin here must be a constant, can not be a variable
// so in adjusting the leverage at the same time you need to adjust the margin in the settings or source code at the same time
// initially set to 80% margin rate that burst
// 1./2*80  2 == leverage, 80 == margin rate that burst
strategy("How to use Leverage in PineScript", overlay=true, pyramiding=1, initial_capital=1000000, default_qty_type=strategy.percent_of_equity, default_qty_value=100, calc_on_order_fills=false, slippage=0, commission_type=strategy.commission.percent, commission_value=0.04,margin_long = 1./2*80,margin_short = 1./2*80)

//////////////////////////////////////////
////////////////Indicators////////////////
//////////////////////////////////////////

length = input( 14 )
overSold = input( 30 )
overBought = input( 70 )
price = close
vrsi = ta.rsi(price, length)
co = ta.crossover(vrsi, overSold)
cu = ta.crossunder(vrsi, overBought)

//////////////////////////////////////////
/////////////////Leverage/////////////////
//////////////////////////////////////////


//The number of decimal places for each position opening, i.e., the accuracy
precision = input.int(1,title='Precision')

//Leverage, the default is 1, here is not recommended to open a high leverage


//Calculate the number of open contracts, here using equity for calculation, considering that everyone compound interest is used for trading equity
Lev = math.max(math.round(strategy.equity * leverage  / close , precision), 0)

if (not na(vrsi))
	if (co)
		strategy.entry("RsiLE", strategy.long,qty = Lev, comment="RsiLE")
	if (cu)
		strategy.entry("RsiSE", strategy.short,qty = Lev, comment="RsiSE")
//plot(strategy.equity, title="equity", color=color.red, linewidth=2, style=plot.style_areabr)