How to get the font size in dollars

AFL Programming
1

as the function plottext the para y - is y-coordinate in dollars

I want to calculate the height of the font in dollers , in order to put the second line, will not cover the first line

which function i can get the font high in dollers

2

This is not the only possibility. Y co-ordinate in PlotText() can be expressed in dollars (price), but it can also be expressed in screen pixels. The same applies to X co-ordinate (Bar index, or pixels). Additionally bar/price co-ordinates can be fractional (for the greater precision). You can also use mixed modes. Read here:

https://www.amibroker.com/guide/afl/gfxsetcoordsmode.html

Besides in AFL there are more possibilities of plotting/drawing text:

  1. PlotText() and PlotTextSetFont()
    AFL Function Reference - PLOTTEXT
    AFL Function Reference - PLOTTEXTSETFONT

  1. GfxTextOut()
    AFL Function Reference - GFXTEXTOUT

  2. GfxDrawText()
    AFL Function Reference - GFXDRAWTEXT

You should consider which way of plotting/drawing text is the best option in your case, because for example if you want to draw the text in some cell / rectangle and be able to format it, align, break the text into lines - like in the example below, you might use GfxDrawText() which takes care of all of those things automatically.

Text

4 Likes
3

I'm afraid I have to correct my previous post. GfxSetCoordsMode() allows to switch co-ordinate system for low-level gfx functions only. PlotText() of course doesn't belong to gfx functions. So yes - in this case X coordinates are expressed in bars and y coordinates in dollars (price). But still, for the greater precision, co-ordinates can be fractional.

Recently I've been using GFX functions a lot, along with GfxSetCoordsMode() - that's the reason for my confusion. Sorry for that :wink:

4 Likes
4

in my case want to do like this

Amibroker0005

and my code is

PlotText( "" + LowPoint[i] , i , L[i] - 0.8 , colorGreen ) ;
PlotText( "" + DownLevel , i , L[i] - 1.6 , colorGreen ) ; 
PlotText( "" + DownLevel1 , i , L[i] - 2.4 , colorGreen ) ;

and How to calculate font height in dollors to fix those fixed values 0.8 1.6 2.4

5

You do not need to do such complication because PlotText and PlotTextSetFont function do have an y-offset argument. And the distance keeps the same no matter which price value and symbol.

Plot( C, "Price", colorDefault, styleCandle );

yoff = 20; // y-offset for PlotText
fntsize = 9;// fontsize of text of PlotText

bi = Barindex();
fvb = FirstVisibleValue( bi );
lvb = LastVisibleValue( bi );
for( i = fvb; i <= lvb; i++ ) {
	PlotText( "" + 1, i, L[i], colorRed, -1, -yoff );
	PlotText( "" + 2 , i, L[i], colorRed, -1, -2*yoff ); 
	PlotText( "" + 3 , i, L[i], colorRed, -1, -3*yoff );	
	
	PlotText( "" + 1, i, H[i], colorGreen, -1, yoff-fntsize );
	PlotText( "" + 2 , i, H[i], colorGreen, -1, 2*yoff-fntsize ); 
	PlotText( "" + 3 , i, h[i], colorGreen, -1, 3*yoff-fntsize );
}

244

5 Likes
6

that is good for me ,

However, I still have a little problem because PlotTextsetFont
The fontsize is set to point, but Y offset is in pixels, how the two are converted, or both refer to the same thing

Or how do I get fontsize in pixel

7

Then convert point to pixel if that makes you happy.

dpi = 96;
pixel = point * dpi / 72;
6 Likes
8

Thank you for solving my problem