279 lines
14 KiB
Markdown
279 lines
14 KiB
Markdown
# OBJ_ELLIPSE
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Ellipse.
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Note
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For ellipse, the mode of filling with color can be set using [OBJPROP_FILL](/en/docs/constants/objectconstants/enum_object_property#enum_object_property_integer) property.
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Example
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The following script creates and moves the ellipse 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 creates ellipse on the chart."
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#property description "Anchor point coordinates are set"
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#property description "in percentage of 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="Ellipse"; // Ellipse name
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input int InpDate1=30; // 1 st point's date, %
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input int InpPrice1=20; // 1 st point's price, %
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input int InpDate2=70; // 2 nd point's date, %
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input int InpPrice2=80; // 2 nd point's price, %
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input int InpDate3=50; // 3 rd point's date, %
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input int InpPrice3=60; // 3 rd point's price, %
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input color InpColor=clrRed; // Ellipse color
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input ENUM_LINE_STYLE InpStyle=STYLE_DASHDOTDOT; // Style of ellipse lines
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input int InpWidth=2; // Width of ellipse lines
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input bool InpFill=false; // Filling ellipse with color
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input bool InpBack=false; // Background ellipse
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input bool InpSelection=true; // Highlight to move
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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 an ellipse by the given coordinates |
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//+------------------------------------------------------------------+
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bool EllipseCreate(const long chart_ID=0, // chart's ID
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const string name="Ellipse", // ellipse 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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datetime time3=0, // third point time
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double price3=0, // third point price
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const color clr=clrRed, // ellipse color
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const ENUM_LINE_STYLE style=STYLE_SOLID, // style of ellipse lines
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const int width=1, // width of ellipse lines
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const bool fill=false, // filling ellipse with color
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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 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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ChangeEllipseEmptyPoints(time1,price1,time2,price2,time3,price3);
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//--- reset the error value
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ResetLastError();
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//--- create an ellipse by the given coordinates
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if(!ObjectCreate(chart_ID,name,OBJ_ELLIPSE,sub_window,time1,price1,time2,price2,time3,price3))
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{
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Print(__FUNCTION__,
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": failed to create an ellipse! Error code = ",GetLastError());
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return(false);
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}
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//--- set an ellipse color
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ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr);
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//--- set style of ellipse lines
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ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style);
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//--- set width of ellipse lines
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ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width);
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//--- enable (true) or disable (false) the mode of filling the ellipse
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ObjectSetInteger(chart_ID,name,OBJPROP_FILL,fill);
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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 highlighting the ellipse for moving
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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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//--- 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 the ellipse anchor point |
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//+------------------------------------------------------------------+
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bool EllipsePointChange(const long chart_ID=0, // chart's ID
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const string name="Ellipse", // ellipse 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 the 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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//| Delete ellipse |
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//+------------------------------------------------------------------+
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bool EllipseDelete(const long chart_ID=0, // chart's ID
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const string name="Ellipse") // ellipse name
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{
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//--- reset the error value
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ResetLastError();
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//--- delete an ellipse
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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 an ellipse! 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 ellipse anchor points and set default values |
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//| for empty ones |
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//+------------------------------------------------------------------+
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void ChangeEllipseEmptyPoints(datetime &time1,double &price1,
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datetime &time2,double &price2,
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datetime &time3,double &price3)
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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, move it 300 points lower than the first one
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if(!price2)
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price2=price1-300*SymbolInfoDouble(Symbol(),SYMBOL_POINT);
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//--- if the third point's time is not set, it coincides with the second point's date
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if(!time3)
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time3=time2;
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//--- if the third point's price is not set, it is equal to the first point's one
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if(!price3)
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price3=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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InpDate3<0 || InpDate3>100 || InpPrice3<0 || InpPrice3>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 ellipse 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 ellipse
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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 d3=InpDate3*(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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int p3=InpPrice3*(accuracy-1)/100;
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//--- create an ellipse
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if(!EllipseCreate(0,InpName,0,date[d1],price[p1],date[d2],price[p2],date[d3],price[p3],
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InpColor,InpStyle,InpWidth,InpFill,InpBack,InpSelection,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 ellipse anchor points
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//--- loop counter
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int v_steps=accuracy/5;
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//--- move the first and second anchor points
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for(int i=0;i<v_steps;i++)
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{
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//--- use the following values
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if(p1<accuracy-1)
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p1+=1;
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if(p2>1)
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p2-=1;
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//--- shift the points
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if(!EllipsePointChange(0,InpName,0,date[d1],price[p1]))
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return;
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if(!EllipsePointChange(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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//--- 1 second of delay
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Sleep(1000);
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//--- loop counter
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int h_steps=bars/5;
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//--- move the third anchor point
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for(int i=0;i<h_steps;i++)
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{
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//--- use the following value
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if(d3>1)
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d3-=1;
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//--- move the point
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if(!EllipsePointChange(0,InpName,2,date[d3],price[p3]))
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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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// 0.05 seconds of delay
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Sleep(50);
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}
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//--- 1 second of delay
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Sleep(1000);
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//--- delete ellipse from the chart
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EllipseDelete(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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