//--- description
#property description "Script draws \"Gann Line\" graphical object."
#property description "Anchor point coordinates are set in percentage of"
#property description "the chart window size."
//--- display window of the input parameters during the script's launch
#property script_show_inputs
//--- input parameters of the script
input string InpName="GannLine"; // Line name
input int InpDate1=20; // 1 st point's date, %
input int InpPrice1=75; // 1 st point's price, %
input int InpDate2=80; // 2 nd point's date, %
input double InpAngle=0.0; // Gann Angle
input double InpScale=1.0; // Scale
input color InpColor=clrRed; // Line color
input ENUM_LINE_STYLE InpStyle=STYLE_DASHDOTDOT; // Line style
input int InpWidth=2; // Line width
input bool InpBack=false; // Background line
input bool InpSelection=true; // Highlight to move
input bool InpRayLeft=false; // Line's continuation to the left
input bool InpRayRight=true; // Line's continuation to the right
input bool InpHidden=true; // Hidden in the object list
input long InpZOrder=0; // Priority for mouse click
//+------------------------------------------------------------------+
//| Create Gann Line by the coordinates, angle and scale |
//+------------------------------------------------------------------+
bool GannLineCreate(const long chart_ID=0, // chart's ID
const string name="GannLine", // 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
const double angle=1.0, // Gann angle
const double scale=1.0, // scale
const color clr=clrRed, // line color
const ENUM_LINE_STYLE style=STYLE_SOLID, // line style
const int width=1, // line width
const bool back=false, // in the background
const bool selection=true, // highlight to move
const bool ray_left=false, // line's continuation to the left
const bool ray_right=true, // line's continuation to the right
const bool hidden=true, // hidden in the object list
const long z_order=0) // priority for mouse click
{
//--- set anchor points' coordinates if they are not set
ChangeGannLineEmptyPoints(time1,price1,time2);
//--- reset the error value
ResetLastError();
//--- create Gann Line by the given coordinates
//--- correct coordinate of the second anchor point is redefined
//--- automatically after Gann angle and/or the scale changes,
if(!ObjectCreate(chart_ID,name,OBJ_GANNLINE,sub_window,time1,price1,time2,0))
{
Print(__FUNCTION__,
": failed to create \"Gann Line\"! Error code = ",GetLastError());
return(false);
}
//--- change Gann angle
ObjectSetDouble(chart_ID,name,OBJPROP_ANGLE,angle);
//--- change the scale (number of pips per bar)
ObjectSetDouble(chart_ID,name,OBJPROP_SCALE,scale);
//--- 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 highlighting the lines for moving
//--- 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 left
ObjectSetInteger(chart_ID,name,OBJPROP_RAY_LEFT,ray_left);
//--- 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);
}
//+------------------------------------------------------------------+
//| Move Gann Line anchor point |
//+------------------------------------------------------------------+
bool GannLinePointChange(const long chart_ID=0, // chart's ID
const string name="GannLine", // line name
const int point_index=0, // anchor point index
datetime time=0, // anchor point time coordinate
double price=0) // anchor point price coordinate
{
//--- if point position is not set, move it to the current bar having Bid price
if(!time)
time=TimeCurrent();
if(!price)
price=SymbolInfoDouble(Symbol(),SYMBOL_BID);
//--- reset the error value
ResetLastError();
//--- move the line's anchor point
if(!ObjectMove(chart_ID,name,point_index,time,price))
{
Print(__FUNCTION__,
": failed to move the anchor point! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| Change Gann angle |
//+------------------------------------------------------------------+
bool GannLineAngleChange(const long chart_ID=0, // chart's ID
const string name="GannLine", // line name
const double angle=1.0) // Gann angle
{
//--- reset the error value
ResetLastError();
//--- change Gann angle
if(!ObjectSetDouble(chart_ID,name,OBJPROP_ANGLE,angle))
{
Print(__FUNCTION__,
": failed to change Gann angle! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| Change Gann Line's scale |
//+------------------------------------------------------------------+
bool GannLineScaleChange(const long chart_ID=0, // chart's ID
const string name="GannLine", // line name
const double scale=1.0) // scale
{
//--- reset the error value
ResetLastError();
//--- change the scale (number of pips per bar)
if(!ObjectSetDouble(chart_ID,name,OBJPROP_SCALE,scale))
{
Print(__FUNCTION__,
": failed to change the scale! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| The function removes Gann Line from the chart |
//+------------------------------------------------------------------+
bool GannLineDelete(const long chart_ID=0, // chart's ID
const string name="GannLine") // line name
{
//--- reset the error value
ResetLastError();
//--- delete Gann line
if(!ObjectDelete(chart_ID,name))
{
Print(__FUNCTION__,
": failed to delete \"Gann Line\"! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| Check the values of Gann Line anchor points and set default |
//| values for empty ones |
//+------------------------------------------------------------------+
void ChangeGannLineEmptyPoints(datetime &time1,double &price1,datetime &time2)
{
//--- if the second point's time is not set, it will be on the current bar
if(!time2)
time2=TimeCurrent();
//--- if the first point's time is not set, it is located 9 bars left from the second one
if(!time1)
{
//--- array for receiving the open time of the last 10 bars
datetime temp[10];
CopyTime(Symbol(),Period(),time2,10,temp);
//--- set the first point 9 bars left from the second one
time1=temp[0];
}
//--- if the first point's price is not set, it will have Bid value
if(!price1)
price1=SymbolInfoDouble(Symbol(),SYMBOL_BID);
}
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{
//--- check correctness of the input parameters
if(InpDate1<0 || InpDate1>100 || InpPrice1<0 || InpPrice1>100 ||
InpDate2<0 || InpDate2>100)
{
Print("Error! Incorrect values of input parameters!");
return;
}
//--- number of visible bars in the chart window
int bars=(int)ChartGetInteger(0,CHART_VISIBLE_BARS);
//--- price array size
int accuracy=1000;
//--- arrays for storing the date and price values to be used
//--- for setting and changing line anchor points' coordinates
datetime date[];
double price[];
//--- memory allocation
ArrayResize(date,bars);
ArrayResize(price,accuracy);
//--- fill the array of dates
ResetLastError();
if(CopyTime(Symbol(),Period(),0,bars,date)==-1)
{
Print("Failed to copy time values! Error code = ",GetLastError());
return;
}
//--- fill the array of prices
//--- find the highest and lowest values of the chart
double max_price=ChartGetDouble(0,CHART_PRICE_MAX);
double min_price=ChartGetDouble(0,CHART_PRICE_MIN);
//--- define a change step of a price and fill the array
double step=(max_price-min_price)/accuracy;
for(int i=0;i<accuracy;i++)
price[i]=min_price+i*step;
//--- define points for drawing Gann Line
int d1=InpDate1*(bars-1)/100;
int d2=InpDate2*(bars-1)/100;
int p1=InpPrice1*(accuracy-1)/100;
//--- create Gann Line
if(!GannLineCreate(0,InpName,0,date[d1],price[p1],date[d2],InpAngle,InpScale,InpColor,
InpStyle,InpWidth,InpBack,InpSelection,InpRayLeft,InpRayRight,InpHidden,InpZOrder))
{
return;
}
//--- redraw the chart and wait for 1 second
ChartRedraw();
Sleep(1000);
//--- now, move the line's anchor point and change the angle
//--- loop counter
int v_steps=accuracy/2;
//--- move the first anchor point vertically
for(int i=0;i<v_steps;i++)
{
//--- use the following value
if(p1>1)
p1-=1;
//--- move the point
if(!GannLinePointChange(0,InpName,0,date[d1],price[p1]))
return;
//--- check if the script's operation has been forcefully disabled
if(IsStopped())
return;
//--- redraw the chart
ChartRedraw();
}
//--- half a second of delay
Sleep(500);
//--- define the current value of Gann angle (changed
//--- after moving the first anchor point)
double curr_angle;
if(!ObjectGetDouble(0,InpName,OBJPROP_ANGLE,0,curr_angle))
return;
//--- loop counter
v_steps=accuracy/8;
//--- change Gann angle
for(int i=0;i<v_steps;i++)
{
if(!GannLineAngleChange(0,InpName,curr_angle-0.05*i))
return;
//--- check if the script's operation has been forcefully disabled
if(IsStopped())
return;
//--- redraw the chart
ChartRedraw();
}
//--- 1 second of delay
Sleep(1000);
//--- delete the line from the chart
GannLineDelete(0,InpName);
ChartRedraw();
//--- 1 second of delay
Sleep(1000);
//---
} |
