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運用ATR製作波動判別工具的方法｜在圖表上繪製×標記的方式

１．沿用趨勢線的範例編碼

在「以ATR製作波動判別工具的方法｜數值的顯示方式與變更顯示顏色的方法」文章中，說明了如何在圖表左下方顯示ATR數值、以及定義圖表四角的時間與價格資訊。接下來，將在圖表上使用趨勢線來繪製×標記。

可從MQL4幫助檔中，複製使用趨勢線的範例編碼。於MQL4幫助檔目錄中點選「Constants, Enumerations and Structures」→「Objects Constants」→「Object Types」，便會顯示物件一覽表。從中選擇「OBJ_TREND」，並將預先準備的「Create a trend line by the given coordinates」編碼複製貼上於檔案的下方。

刪除「//— set anchor points’ coordinates if they are not set」與「ChangeTrendEmptyPoints(time1,price1,time2,price2);」兩行，並將「Print(__FUNCTION__,」與「”: failed to create a trend line! Error code = “, GetLastError());」兩行以「/*」「*/」作為註解。其次，使用「ObjectMove」以反映數值變化。在「return(false);」上方添加「ObjectMove(chart_ID, name, 0, time1, price1);」「ObjectMove(chart_ID, name, 1, time2, price2);」兩行，便能同時指定時間資訊與價格資訊。

另外，應變更兩處預設值。在「// in the background」將「back = false」變更為「back = true」、以及在「// highlight to move」將「selection = true」變更為「selection = false」。

//+——————————————————————+

//| Create a trend line by the given coordinates |

//+——————————————————————+

bool TrendCreate(const long chart_ID = 0, // chart’s ID

const string name = “TrendLine”, // line name

const int sub_window = 0, // subwindow index

datetime time1 = 0, // first point time

double price1 = 0, // first point price

datetime time2 = 0, // second point time

double price2 = 0, // second point price

const color clr = clrRed, // line color

const ENUM_LINE_STYLE style = STYLE_SOLID, // line style

const int width = 1, // line width

const bool back = true, // in the background

const bool selection = false, // highlight to move

const bool ray_right = false, // line’s continuation to the right

const bool hidden = true, // hidden in the object list

const long z_order = 0) // priority for mouse click

{

//— reset the error value

ResetLastError();

//— create a trend line by the given coordinates

if(!ObjectCreate(chart_ID, name, OBJ_TREND, sub_window, time1, price1, time2, price2)) {

/* Print(__FUNCTION__,

“: failed to create a trend line! Error code = “,GetLastError());*/

ObjectMove(chart_ID, name, 0, time1, price1);

ObjectMove(chart_ID, name, 0, time1, price1);

return(false);

}

//— set line color

ObjectSetInteger(chart_ID, name, OBJPROP_COLOR, clr);

//— set line display style

ObjectSetInteger(chart_ID, name, OBJPROP_STYLE, style);

//— set line width

ObjectSetInteger(chart_ID, name, OBJPROP_WIDTH, width);

//— display in the foreground (false) or background (true)

ObjectSetInteger(chart_ID, name, OBJPROP_BACK, back);

//— enable (true) or disable (false) the mode of moving the line by mouse

//— when creating a graphical object using ObjectCreate function, the object cannot be

//— highlighted and moved by default. Inside this method, selection parameter

//— is true by default making it possible to highlight and move the object

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTABLE, selection);

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTED, selection);

//— enable (true) or disable (false) the mode of continuation of the line’s display to the right

ObjectSetInteger(chart_ID, name, OBJPROP_RAY_RIGHT, ray_right);

//— hide (true) or display (false) graphical object name in the object list

ObjectSetInteger(chart_ID, name, OBJPROP_HIDDEN, hidden);

//— set the priority for receiving the event of a mouse click in the chart

ObjectSetInteger(chart_ID, name, OBJPROP_ZORDER, z_order);

//— successful execution

return(true);

}

2．以TrendCreate顯示×標記

與LabelCreate一樣，在DrawX()中執行TrendCreate。首先繪製右下方的趨勢線。參數的部分，圖表ID設定為「0」、名稱為「PREFIX + “X0″」、視窗為「0」、左邊的時間為「timeL」、該價格為「max」、右邊的時間為「timeR」、該價格為「min」、顏色是已定義的「clrX」、樣式為實線的「STYLE_SOLID」、寬度為「100」。由於希望使用×標記，因此同樣使用TrendCreate來繪製右上方的趨勢線。

TrendCreate(0, PREFIX + “X0”, 0, timeL, max, timeR, min, clrX, STYLE_SOLID, 100);

TrendCreate(0, PREFIX + “X1”, 0, timeL, min, timeR, max, clrX, STYLE_SOLID, 100);

如此進行編譯，就可在圖表上繪製出橘色的×標記。

但是，如果就這樣移動圖表或擴大、縮小價格的顯示範圍，×標記並不會隨之移動。

為了在圖表出現變化時進行相同的處理動作，需在OnChartEvent函數內新增以下if文體。

if (id == CHARTEVENT_CHART_CHANGE) DrawX();

如此一來，即使圖表有所改變，×標記也會隨之變更。

3．原始碼

本次製作的原始碼如以下所示。

//+——————————————————————+

//| ATR_Judge.mq4 |

//| Copyright 2022, MetaQuotes Software Corp. |

//| https://www.mql5.com |

//+——————————————————————+

#property copyright “Copyright 2022, MetaQuotes Software Corp.”

#property link “https://www.mql5.com”

#property version “1.00”

#property strict

#property indicator_chart_window

#define PREFIX MQLInfoString(MQL_PROGRAM_NAME) + “_”

//— input parameters

input ENUM_TIMEFRAMES TF = PERIOD_M5; // 時間足

input int PERIOD = 14; // 期間　

input double LEVEL = 1.5; // 許容値

//+——————————————————————+

//| Custom indicator initialization function |

//+——————————————————————+

int OnInit()

{

//— indicator buffers mapping

//—

return(INIT_SUCCEEDED);

}

//+——————————————————————+

//| Custom indicator deinitialization function |

//+——————————————————————+

void OnDeinit(const int reason)

{

ObjectsDeleteAll(0, PREFIX);

}

//+——————————————————————+

//| Custom indicator iteration function |

//+——————————————————————+

int OnCalculate(const int rates_total,

const int prev_calculated,

const datetime &time[],

const double &open[],

const double &high[],

const double &low[],

const double &close[],

const long &tick_volume[],

const long &volume[],

const int &spread[])

{

//—

DrawX();

//— return value of prev_calculated for next call

return(rates_total);

}

//+——————————————————————+

//| ChartEvent function |

//+——————————————————————+

void OnChartEvent(const int id,

const long &lparam,

const double &dparam,

const string &sparam)

{

//—

if (id == CHARTEVENT_CHART_CHANGE) DrawX();

}

//+——————————————————————+

//| Draw function |

//+——————————————————————+

void DrawX()

{

double atr = iATR(NULL, TF, PERIOD, 1) / _Point / 10;

bool small = atr < LEVEL;

color clrATR = small ? clrRed : clrWhite;

LabelCreate(0, PREFIX + “ATR”, 0, 0, 0, CORNER_LEFT_LOWER, DoubleToString(atr, 1), “Arial Bold”, 20, clrATR, 0, ANCHOR_LEFT_LOWER);

double max = ChartGetDouble(0, CHART_PRICE_MAX);

double min = ChartGetDouble(0, CHART_PRICE_MIN);

int barL = (int)ChartGetInteger(0, CHART_FIRST_VISIBLE_BAR);

int barR = barL – (int)ChartGetInteger(0, CHART_WIDTH_IN_BARS);

datetime timeL = Time[barL];

datetime timeR = barR >= 0 ? Time[barR] : Time[0] – barR * PeriodSeconds();

color clrX = small ? clrOrange : clrNONE;

TrendCreate(0, PREFIX + “X0”, 0, timeL, max, timeR, min, clrX, STYLE_SOLID, 100);

TrendCreate(0, PREFIX + “X1”, 0, timeL, min, timeR, max, clrX, STYLE_SOLID, 100);

}

//+——————————————————————+

//| Create a text label |

//+——————————————————————+

bool LabelCreate(const long chart_ID = 0, // chart’s ID

const string name = “Label”, // label name

const int sub_window = 0, // subwindow index

const int x = 0, // X coordinate

const int y = 0, // Y coordinate

const ENUM_BASE_CORNER corner = CORNER_LEFT_UPPER, // chart corner for anchoring

const string text = “Label”, // text

const string font = “Arial”, // font

const int font_size = 10, // font size

const color clr = clrRed, // color

const double angle = 0.0, // text slope

const ENUM_ANCHOR_POINT anchor = ANCHOR_LEFT_UPPER, // anchor type

const bool back = false, // in the background

const bool selection = false, // highlight to move

const bool hidden = true, // hidden in the object list

const long z_order = 0) // priority for mouse click

{

//— reset the error value

ResetLastError();

//— create a text label

if(!ObjectCreate(chart_ID, name, OBJ_LABEL, sub_window, 0, 0)) {

/* Print(__FUNCTION__,

“: failed to create text label! Error code = “,GetLastError());*/

ObjectSetString(chart_ID, name, OBJPROP_TEXT, text);

ObjectSetInteger(chart_ID, name, OBJPROP_COLOR, clr);

return(false);

}

//— set label coordinates

ObjectSetInteger(chart_ID, name, OBJPROP_XDISTANCE, x);

ObjectSetInteger(chart_ID, name, OBJPROP_YDISTANCE, y);

//— set the chart’s corner, relative to which point coordinates are defined

ObjectSetInteger(chart_ID, name, OBJPROP_CORNER, corner);

//— set the text

ObjectSetString(chart_ID, name, OBJPROP_TEXT, text);

//— set text font

ObjectSetString(chart_ID, name, OBJPROP_FONT, font);

//— set font size

ObjectSetInteger(chart_ID, name, OBJPROP_FONTSIZE, font_size);

//— set the slope angle of the text

ObjectSetDouble(chart_ID, name, OBJPROP_ANGLE, angle);

//— set anchor type

ObjectSetInteger(chart_ID, name, OBJPROP_ANCHOR, anchor);

//— set color

ObjectSetInteger(chart_ID, name, OBJPROP_COLOR, clr);

//— display in the foreground (false) or background (true)

ObjectSetInteger(chart_ID, name, OBJPROP_BACK, back);

//— enable (true) or disable (false) the mode of moving the label by mouse

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTABLE, selection);

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTED, selection);

//— hide (true) or display (false) graphical object name in the object list

ObjectSetInteger(chart_ID, name, OBJPROP_HIDDEN, hidden);

//— set the priority for receiving the event of a mouse click in the chart

ObjectSetInteger(chart_ID, name, OBJPROP_ZORDER, z_order);

//— successful execution

return(true);

}

//+——————————————————————+

//| Create a trend line by the given coordinates |

//+——————————————————————+

bool TrendCreate(const long chart_ID = 0, // chart’s ID

const string name = “TrendLine”, // line name

const int sub_window = 0, // subwindow index

datetime time1 = 0, // first point time

double price1 = 0, // first point price

datetime time2 = 0, // second point time

double price2 = 0, // second point price

const color clr = clrRed, // line color

const ENUM_LINE_STYLE style = STYLE_SOLID, // line style

const int width = 1, // line width

const bool back = true, // in the background

const bool selection = false, // highlight to move

const bool ray_right = false, // line’s continuation to the right

const bool hidden = true, // hidden in the object list

const long z_order = 0) // priority for mouse click

{

//— reset the error value

ResetLastError();

//— create a trend line by the given coordinates

if(!ObjectCreate(chart_ID, name, OBJ_TREND, sub_window, time1, price1, time2, price2)) {

/* Print(__FUNCTION__,

“: failed to create a trend line! Error code = “,GetLastError());*/

ObjectMove(chart_ID, name, 0, time1, price1);

ObjectMove(chart_ID, name, 1, time2, price2);

return(false);

}

//— set line color

ObjectSetInteger(chart_ID, name, OBJPROP_COLOR, clr);

//— set line display style

ObjectSetInteger(chart_ID, name, OBJPROP_STYLE, style);

//— set line width

ObjectSetInteger(chart_ID, name, OBJPROP_WIDTH, width);

//— display in the foreground (false) or background (true)

ObjectSetInteger(chart_ID, name, OBJPROP_BACK, back);

//— enable (true) or disable (false) the mode of moving the line by mouse

//— when creating a graphical object using ObjectCreate function, the object cannot be

//— highlighted and moved by default. Inside this method, selection parameter

//— is true by default making it possible to highlight and move the object

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTABLE, selection);

ObjectSetInteger(chart_ID, name, OBJPROP_SELECTED, selection);

//— enable (true) or disable (false) the mode of continuation of the line’s display to the right

ObjectSetInteger(chart_ID, name, OBJPROP_RAY_RIGHT, ray_right);

//— hide (true) or display (false) graphical object name in the object list

ObjectSetInteger(chart_ID, name, OBJPROP_HIDDEN, hidden);

//— set the priority for receiving the event of a mouse click in the chart

ObjectSetInteger(chart_ID, name, OBJPROP_ZORDER, z_order);

//— successful execution

return(true);

}

: 可從MQL4幫助檔中，複製使用趨勢線的範例編碼。於MQL4幫助檔目錄中點選「Constants, Enumerations and Structures」→「Objects Constants」→「Object Types」，便會顯示物件一覽表。從中選擇「OBJ_TREND」，並將預先準備的「Create a trend line by the given coordinates」編碼複製貼上於檔案的下方。
: 與LabelCreate一樣，在DrawX()中執行TrendCreate。首先繪製右下方的趨勢線。參數的部分，圖表ID設定為「0」、名稱為「PREFIX + “X0″」、視窗為「0」、左邊的時間為「timeL」、該價格為「max」、右邊的時間為「timeR」、該價格為「min」、顏色是已定義的「clrX」、樣式為實線的「STYLE_SOLID」、寬度為「100」。由於希望使用×標記，因此同樣使用TrendCreate來繪製右上方的趨勢線。