Improving Documentation
There is code example, which contains meaningful part - it includes initialization of color colors[] array, which afterwards is always called with constant "color_sections=8;", and later in code it has no influence of how ColorArrowColors[]is filled with values.
You don't know and don't understand when reading the program.
So don't say "It seems that MQl5 Documentation contains some errors and/or misleading information."
"There is code example, which contains meaningful part - it includes initialization of color colors[] array, which afterwards is always called with constant "color_sections=8;", and later in the code it has no influence of how ColorArrowColors[]is filled with values.?"
//+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- indicator buffers mapping SetIndexBuffer(0,ColorArrowBuffer,INDICATOR_DATA); SetIndexBuffer(1,ColorArrowColors,INDICATOR_COLOR_INDEX); //--- Define the symbol code for drawing in PLOT_ARROW PlotIndexSetInteger(0,PLOT_ARROW,code); //--- Set the vertical shift of arrows in pixels PlotIndexSetInteger(0,PLOT_ARROW_SHIFT,5); //--- Set as an empty value 0 PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0); //---- The number of colors to color the sinusoid color_sections=8; // see a comment to #property indicator_color1 //--- return(INIT_SUCCEEDED); }
how ColorArrowColors[]is filled with values?
for(int i=1;i<rates_total;i++) { //--- If the current Close price is higher than the previous one, draw an arrow if(close[i]>close[i-1]) ColorArrowBuffer[i]=close[i]; //--- Otherwise specify the null value else ColorArrowBuffer[i]=0; //--- Arrow color int index=i%color_sections; ColorArrowColors[i]=index; }
You don't know and don't understand when reading the program.
So don't say "It seems that MQl5 Documentation contains some errors and/or misleading information."
"There is code example, which contains meaningful part - it includes initialization of color colors[] array, which afterwards is always called with constant "color_sections=8;", and later in the code it has no influence of how ColorArrowColors[]is filled with values.?"
how ColorArrowColors[]is filled with values?
Roberto, you just need to be a bit smarter and understand a simple truth - this 2nd part of code is going to work without declaration of colors[] array!
Just delete declaration of colors[] array and enjoin simplified code!
And also you just need to be a bit attentive to notice mismatch between value of "color_sections" constant (=8) and number of colors in colors[] array(=14)!
Roberto, you just need to be a bit smarter and understand a simple truth - this 2nd part of code is going to work without declaration of colors[] array!
Just delete declaration of colors[] array and enjoin simplified code!
And also you just need to be a bit attentive to notice mismatch between value of "color_sections" constant (=8) and number of colors in colors[] array(=14)!
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It seems that MQl5 Documentation contains some errors and/or misleading information.
So I've started thread to collect such observations in order to help MQ team to amend errors and improve overall the quality of Documentation.
My personal observation, from which I want to start is about article "DRAW_COLOR_ARROW". There is code example, which contains meaningful part - it includes initialization of color colors[] array, which afterwards is always called with constant "color_sections=8;", and later in code it has no influence of how ColorArrowColors[]is filled with values. MQ, please correct this confusing example.