284 lines
14 KiB
Markdown
284 lines
14 KiB
Markdown
# OBJ_TREND
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Trend Line.
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Note
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For Trend Line, it is possible to specify the mode of continuation of its display to the right and/or left ([OBJPROP_RAY_RIGHT](/en/docs/constants/objectconstants/enum_object_property#enum_object_property_integer) and [OBJPROP_RAY_LEFT](/en/docs/constants/objectconstants/enum_object_property#enum_object_property_integer) properties accordingly).
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Example
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The following script creates and moves the trend line on the chart. Special functions have been developed to create and change graphical object's properties. You can use these functions "as is" in your own applications.
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```
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//--- description
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#property description "Script draws \"Trend Line\" graphical object."
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#property description "Anchor point coordinates are set in percentage of"
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#property description "the chart window size."
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//--- display window of the input parameters during the script's launch
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#property script_show_inputs
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//--- input parameters of the script
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input string InpName="Trend"; // Line name
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input int InpDate1=35; // 1 st point's date, %
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input int InpPrice1=60; // 1 st point's price, %
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input int InpDate2=65; // 2 nd point's date, %
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input int InpPrice2=40; // 2 nd point's price, %
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input color InpColor=clrRed; // Line color
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input ENUM_LINE_STYLE InpStyle=STYLE_DASH; // Line style
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input int InpWidth=2; // Line width
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input bool InpBack=false; // Background line
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input bool InpSelection=true; // Highlight to move
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input bool InpRayLeft=false; // Line's continuation to the left
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input bool InpRayRight=false; // Line's continuation to the right
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input bool InpHidden=true; // Hidden in the object list
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input long InpZOrder=0; // Priority for mouse click
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//+------------------------------------------------------------------+
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//| Create a trend line by the given coordinates |
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//+------------------------------------------------------------------+
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bool TrendCreate(const long chart_ID=0, // chart's ID
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const string name="TrendLine", // line name
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const int sub_window=0, // subwindow index
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datetime time1=0, // first point time
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double price1=0, // first point price
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datetime time2=0, // second point time
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double price2=0, // second point price
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const color clr=clrRed, // line color
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const ENUM_LINE_STYLE style=STYLE_SOLID, // line style
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const int width=1, // line width
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const bool back=false, // in the background
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const bool selection=true, // highlight to move
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const bool ray_left=false, // line's continuation to the left
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const bool ray_right=false, // line's continuation to the right
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const bool hidden=true, // hidden in the object list
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const long z_order=0) // priority for mouse click
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{
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//--- set anchor points' coordinates if they are not set
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ChangeTrendEmptyPoints(time1,price1,time2,price2);
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//--- reset the error value
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ResetLastError();
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//--- create a trend line by the given coordinates
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if(!ObjectCreate(chart_ID,name,OBJ_TREND,sub_window,time1,price1,time2,price2))
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{
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Print(__FUNCTION__,
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": failed to create a trend line! Error code = ",GetLastError());
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return(false);
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}
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//--- set line color
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ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr);
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//--- set line display style
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ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style);
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//--- set line width
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ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width);
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//--- display in the foreground (false) or background (true)
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ObjectSetInteger(chart_ID,name,OBJPROP_BACK,back);
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//--- enable (true) or disable (false) the mode of moving the line by mouse
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//--- when creating a graphical object using ObjectCreate function, the object cannot be
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//--- highlighted and moved by default. Inside this method, selection parameter
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//--- is true by default making it possible to highlight and move the object
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ObjectSetInteger(chart_ID,name,OBJPROP_SELECTABLE,selection);
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ObjectSetInteger(chart_ID,name,OBJPROP_SELECTED,selection);
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//--- enable (true) or disable (false) the mode of continuation of the line's display to the left
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ObjectSetInteger(chart_ID,name,OBJPROP_RAY_LEFT,ray_left);
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//--- enable (true) or disable (false) the mode of continuation of the line's display to the right
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ObjectSetInteger(chart_ID,name,OBJPROP_RAY_RIGHT,ray_right);
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//--- hide (true) or display (false) graphical object name in the object list
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ObjectSetInteger(chart_ID,name,OBJPROP_HIDDEN,hidden);
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//--- set the priority for receiving the event of a mouse click in the chart
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ObjectSetInteger(chart_ID,name,OBJPROP_ZORDER,z_order);
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//--- successful execution
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Move trend line anchor point |
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//+------------------------------------------------------------------+
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bool TrendPointChange(const long chart_ID=0, // chart's ID
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const string name="TrendLine", // line name
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const int point_index=0, // anchor point index
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datetime time=0, // anchor point time coordinate
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double price=0) // anchor point price coordinate
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{
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//--- if point position is not set, move it to the current bar having Bid price
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if(!time)
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time=TimeCurrent();
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if(!price)
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price=SymbolInfoDouble(Symbol(),SYMBOL_BID);
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//--- reset the error value
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ResetLastError();
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//--- move trend line's anchor point
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if(!ObjectMove(chart_ID,name,point_index,time,price))
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{
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Print(__FUNCTION__,
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": failed to move the anchor point! Error code = ",GetLastError());
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return(false);
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}
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//--- successful execution
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return(true);
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}
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//+------------------------------------------------------------------+
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//| The function deletes the trend line from the chart. |
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//+------------------------------------------------------------------+
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bool TrendDelete(const long chart_ID=0, // chart's ID
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const string name="TrendLine") // line name
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{
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//--- reset the error value
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ResetLastError();
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//--- delete a trend line
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if(!ObjectDelete(chart_ID,name))
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{
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Print(__FUNCTION__,
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": failed to delete a trend line! Error code = ",GetLastError());
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return(false);
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}
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//--- successful execution
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Check the values of trend line's anchor points and set default |
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//| values for empty ones |
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//+------------------------------------------------------------------+
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void ChangeTrendEmptyPoints(datetime &time1,double &price1,
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datetime &time2,double &price2)
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{
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//--- if the first point's time is not set, it will be on the current bar
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if(!time1)
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time1=TimeCurrent();
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//--- if the first point's price is not set, it will have Bid value
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if(!price1)
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price1=SymbolInfoDouble(Symbol(),SYMBOL_BID);
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//--- if the second point's time is not set, it is located 9 bars left from the second one
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if(!time2)
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{
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//--- array for receiving the open time of the last 10 bars
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datetime temp[10];
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CopyTime(Symbol(),Period(),time1,10,temp);
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//--- set the second point 9 bars left from the first one
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time2=temp[0];
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}
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//--- if the second point's price is not set, it is equal to the first point's one
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if(!price2)
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price2=price1;
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}
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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//--- check correctness of the input parameters
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if(InpDate1<0 || InpDate1>100 || InpPrice1<0 || InpPrice1>100 ||
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InpDate2<0 || InpDate2>100 || InpPrice2<0 || InpPrice2>100)
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{
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Print("Error! Incorrect values of input parameters!");
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return;
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}
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//--- number of visible bars in the chart window
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int bars=(int)ChartGetInteger(0,CHART_VISIBLE_BARS);
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//--- price array size
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int accuracy=1000;
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//--- arrays for storing the date and price values to be used
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//--- for setting and changing line anchor points' coordinates
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datetime date[];
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double price[];
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//--- memory allocation
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ArrayResize(date,bars);
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ArrayResize(price,accuracy);
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//--- fill the array of dates
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ResetLastError();
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if(CopyTime(Symbol(),Period(),0,bars,date)==-1)
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{
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Print("Failed to copy time values! Error code = ",GetLastError());
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return;
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}
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//--- fill the array of prices
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//--- find the highest and lowest values of the chart
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double max_price=ChartGetDouble(0,CHART_PRICE_MAX);
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double min_price=ChartGetDouble(0,CHART_PRICE_MIN);
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//--- define a change step of a price and fill the array
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double step=(max_price-min_price)/accuracy;
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for(int i=0;i<accuracy;i++)
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price[i]=min_price+i*step;
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//--- define points for drawing the line
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int d1=InpDate1*(bars-1)/100;
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int d2=InpDate2*(bars-1)/100;
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int p1=InpPrice1*(accuracy-1)/100;
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int p2=InpPrice2*(accuracy-1)/100;
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//--- create a trend line
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if(!TrendCreate(0,InpName,0,date[d1],price[p1],date[d2],price[p2],InpColor,InpStyle,
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InpWidth,InpBack,InpSelection,InpRayLeft,InpRayRight,InpHidden,InpZOrder))
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{
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return;
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}
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//--- redraw the chart and wait for 1 second
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ChartRedraw();
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Sleep(1000);
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//--- now, move the line's anchor points
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//--- loop counter
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int v_steps=accuracy/5;
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//--- move the first anchor point vertically
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for(int i=0;i<v_steps;i++)
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{
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//--- use the following value
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if(p1>1)
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p1-=1;
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//--- move the point
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if(!TrendPointChange(0,InpName,0,date[d1],price[p1]))
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return;
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//--- check if the script's operation has been forcefully disabled
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if(IsStopped())
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return;
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//--- redraw the chart
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ChartRedraw();
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}
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//--- move the second anchor point vertically
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for(int i=0;i<v_steps;i++)
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{
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//--- use the following value
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if(p2<accuracy-1)
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p2+=1;
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//--- move the point
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if(!TrendPointChange(0,InpName,1,date[d2],price[p2]))
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return;
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//--- check if the script's operation has been forcefully disabled
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if(IsStopped())
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return;
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//--- redraw the chart
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ChartRedraw();
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}
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//--- half a second of delay
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Sleep(500);
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//--- loop counter
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int h_steps=bars/2;
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//--- move both anchor points horizontally at the same time
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for(int i=0;i<h_steps;i++)
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{
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//--- use the following values
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if(d1<bars-1)
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d1+=1;
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if(d2>1)
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d2-=1;
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//--- shift the points
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if(!TrendPointChange(0,InpName,0,date[d1],price[p1]))
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return;
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if(!TrendPointChange(0,InpName,1,date[d2],price[p2]))
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return;
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//--- check if the script's operation has been forcefully disabled
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if(IsStopped())
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return;
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//--- redraw the chart
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ChartRedraw();
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// 0.03 seconds of delay
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Sleep(30);
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}
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//--- 1 second of delay
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Sleep(1000);
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//--- delete a trend line
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TrendDelete(0,InpName);
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ChartRedraw();
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//--- 1 second of delay
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Sleep(1000);
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//---
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}
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```
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