Discussion of article "Custom indicators and infographics in CCanvas"

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New article Custom indicators and infographics in CCanvas has been published:

The article considers new types of indicators with more complex structural implementation. It also describes the development of pseudo-3D indicator types and dynamic infographics.

We have examined the classes and principles of constructing complex shapes using primitives. While describing the class for constructing histogram-type indicators, I have mentioned plotting pseudo-3D objects (Fig. 13) by means of color selection. However, the pyramid is not a flat figure. Therefore, we have to use its isometric projection in a given two-dimensional coordinate system. The basic structure does not contain too many elements (Fig.14), but the method of the pyramid projection and visualization is the main part of the class implementation.

Fig. 14. Basic structure of the CPyramid class

Author: Alexander Fedosov

 

It's cool, but there's no anti-aliasing at all. Drawing with pixel squares is behind the times.

Here is an example that demonstrates that antialiasing exists in nature:


 
Nikolai Semko:

It's cool, but there's no anti-aliasing at all. Drawing with pixel squares is behind the times.

Here is an example that demonstrates that antialiasing exists in nature:


And the code?

 
Rashid Umarov:

And the code?


You're welcome:

#property copyright   "2009-2017, MetaQuotes Software Corp."
#property link        "https://www.mql5.com"
#property description "Demonstrating Canvas features"
#property script_show_inputs 
//---
#include <Canvas\CanvasPro.mqh>
//+------------------------------------------------------------------+
//| inputs|
//+------------------------------------------------------------------+
input int pause = 20;   // delay in milliseconds between output to the screen
input bool top = false; // draw under the graph?
input ENUM_COLOR_FORMAT format=COLOR_FORMAT_ARGB_NORMALIZE; //Colour processing method
input int Ncirl =30;    // number of circles
input int MaxSizeCircle = 200; // maximum size of circles
//+------------------------------------------------------------------+
//| Script programme start function|
//+------------------------------------------------------------------+
int OnStart(void)
  {

   double r1[],r2[],k1[],k2[];
   int x[],y[];
   uint col[];
   int j=0;
   ArrayResize(r1,Ncirl);
   ArrayResize(r2,Ncirl);
   ArrayResize(k1,Ncirl);
   ArrayResize(k2,Ncirl);
   ArrayResize(x,Ncirl);
   ArrayResize(y,Ncirl);
   ArrayResize(col,Ncirl);
   
   ChartSetInteger(0,CHART_FOREGROUND,top);
   int Width =(ushort)ChartGetInteger(0,CHART_WIDTH_IN_PIXELS);  // get Window Width
   int Height=(ushort)ChartGetInteger(0,CHART_HEIGHT_IN_PIXELS); // get the window height
   uint ColorScreen=(color)ChartGetInteger(0,CHART_COLOR_BACKGROUND,0);// get window background colour

   CCanvasPro canvas;
   if(!canvas.CreateBitmapLabel("SampleCanvas",0,0,Width,Height,format))
     {
      Print("Error creating canvas: ",GetLastError());
      return(-1);
     }
   canvas.SetBack(false);
   canvas.Erase(ColorScreen);
   canvas.Update();
   srand(GetTickCount());
   for(int i=0;i<Ncirl;i++)
     {
      x[i]=rand()%Width;
      y[i]=rand()%Height;
      r1[i]=rand()%MaxSizeCircle;
      r2[i]=rand()%MaxSizeCircle;
      k1[i]=(double)(rand()%10)/1000;
      k2[i]=(double)(rand()%10)/1000;
      col[i]=XRGB(rand()%255,rand()%255,rand()%255);
     }
   while(!IsStopped())
     {
      canvas.Erase(ColorScreen);
      for(int i=0;i<Ncirl;i++) canvas.CircleSS(x[i],y[i],r1[i]*fabs(sin(j*k1[i])),r2[i]*fabs(sin(j*k2[i])),col[i]);
      Sleep(pause);
      canvas.Update();
      j++;
     }

   ObjectDelete(0,"SampleCanvas");
   canvas.Destroy();
   return(0);
  }
Files:
CanvasSampleMy.ex5  37 kb
CanvasSampleMy.mq5  6 kb
 
Rashid Umarov:

And the code?


The standard cCanvas already has several smoothing methods for all shapes, right?

 
Andrey Barinov:

The standard cCanvas already has several smoothing methods for all shapes.

Alas. Even the last circle function based on the Wu method contains bugs and gives a noticeable error in smoothing in diagonal places of the circle because of the primitiveness of this method, and is very suboptimal in terms of speed. Moreover, the smoothed filled shapes simply do not exist.
 
Nikolai Semko:
Alas. Even the last circle function based on Wu's method contains bugs and gives a noticeable error in smoothing in diagonal places of the circle because of the primitiveness of this method, and is very suboptimal in terms of speed. Especially smoothed filled shapes simply do not exist.
Well, then I can only join the question.

And the code?
 
Rashid Umarov:

And the code?

Andrey Barinov:
Well, then I can only join the question.

And the code?

It is strange why you are asking me this question. I don't work in Metaquotes, though I dream of working there. If I worked in this company, then I would be able to work well on this question, as well as not only on the question of smoothing in CCanvas library, but also, for example, on full-fledged 3D functions in canvas.
But now I have only experiments made on my knees, which I am afraid to publish, because I know that I can do better, but it takes time.

I really don't understand why all realisations with the help of kanvas (in this article or, for example, here) are implemented without smoothing. After all, you have to agree, it is striking to the eye this snag because of the pixel saw and how much cooler it would look with the use of antialiasing. Well go to any website, look in your iPhone or Android, there are solid round or rounded buttons. Will you find circles there without anti-aliasing? But why is there still no full-fledged implementation of smoothing in MQL5!?!?, the language that claims to take a place in the sun. Am I wrong? That's why I started this topic and posted this example to show that there is nothing supernatural about it:
Files:
CanvasSampleMy.ex5  37 kb
 
Nikolai Semko:

It is strange why you are asking me this question. I don't work for Metaquotes, although I dream of working there. If I worked in this company, then I would be able to work well on this issue, as well as not only on the issue of anti-aliasing in CCanvas library, but also, for example, on full 3D functions in canvas.
But now only experiments, assembled on my knees, which I am afraid to publish, because I know that I can do better, but it takes time.

Do the work, write an article. And you will get paid and it will be useful.
 

For the 10th time, the topic is marked unread, although there are no post edits or new posts.

Is someone messing around or is the forum keying up?

 
Andrey Khatimlianskii:

For the 10th time, the topic is marked unread, although there are no post edits or new posts.

Is someone messing around or is the forum keying up?


I have a suspicion that the authors (author?) is editing his post.

Another option: someone started to write a post and quit, now this post hangs in edit mode, and the forum every minute (5, 10 minutes?) notes that something is happening in the topic.

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