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Hot Topic (More than 10 Replies) Node text is always bold (Read 7200 times)
Al
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Node text is always bold
Nov 5th, 2014 at 9:45am
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Hi,
I have tried setting a specific font as below but my text always appears bold

Code (Javascript)
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var Font = MindFusion.Drawing.Font;
diagramNode.setFont(new Font("Arial", 8 * 25.44 / 72, false, false));
  
mindfusion2.png (Attachment deleted)
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Stoyo
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Re: Node text is always bold
Reply #1 - Nov 5th, 2014 at 11:19am
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Hi,

It doesn't look bold in our test page. Check if you aren't assigning a bold font later on.
  
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Untitled_013.png
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Al
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Re: Node text is always bold
Reply #2 - Nov 5th, 2014 at 12:29pm
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It is strange, you can see from my screenshot that the text 'Closed' just above the mindfusion diagram is different to the node text - and they are both arial(8).

In the console when I run
Code (Javascript)
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diagram.elements[0].item.font


I get

Code (Javascript)
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a.Font {name: "Arial", size: 2.8266666666666667, bold: false, italic: false, toString: function}function}


So it is definitely set correctly on my node. I can't see that anything else could affect this.
  
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Stoyo
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Re: Node text is always bold
Reply #3 - Nov 5th, 2014 at 1:49pm
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In what browser are you seeing this?
  
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Al
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Re: Node text is always bold
Reply #4 - Nov 5th, 2014 at 3:15pm
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Chrome(38),  IE looks a bit better but I'm still not certain that it is right.
  
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Stoyo
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Re: Node text is always bold
Reply #5 - Nov 6th, 2014 at 9:03am
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Chrome does not show it bold for me, but with hardware acceleration it might depend on how the video card handles font scaling applied for diagram's MeasureUnit. To avoid scaling try setting MeasureUnit to Pixel or Point, and specify larger values for node and font sizes.
  
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Al
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Re: Node text is always bold
Reply #6 - Nov 6th, 2014 at 9:33am
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Please show me how - is this on the canvas element or a property of diagram.xxxx ?
  
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Stoyo
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Re: Node text is always bold
Reply #7 - Nov 6th, 2014 at 10:25am
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It's a Diagram property inherited from base MindFusion.Drawing.Canvas class:

Code
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var GraphicsUnit = MindFusion.Drawing.GraphicsUnit;
diagram.setMeasureUnit(GraphicsUnit.Pixel);
  
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Al
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Re: Node text is always bold
Reply #8 - Nov 6th, 2014 at 2:48pm
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It definitely gets smaller using point, both versions seem to have some weird spacing though & all other text on my page using the same font displays just fine.
  
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Stoyo
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Re: Node text is always bold
Reply #9 - Nov 7th, 2014 at 9:01am
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It seems Chrome applies some anti-aliasing and the text looks bolder when drawing text on non-white background:

Code
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<html>

<body>

<div style="font:10pt Arial">
test test
</div>

<canvas ID="myCanvas">

<script>
var c=document.getElementById("myCanvas");
 var ctx=c.getContext("2d");

 ctx.fillStyle="gray"
 ctx.fillRect(0, 0, 200, 200)

 ctx.font="10pt Arial";
 ctx.fillStyle="white"
 ctx.fillText("test test",10,50);

</script>

 </body>

 </html>


The div and canvas texts look the same in IE, but canvas one is bolder in Chrome, while if you remove the fillStyles to draw black on white it looks the same in both browsers. You might also be getting different font sizes in HTML and Canvas. Our font class assumes font size in pixels and appends px suffix; you could replace this method with your own version if you want to specify fonts in other unit:

Code
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Font.prototype.toString = function ()
{
	var font = ""
	if (this.bold)
		font += 'bold ';
	if (this.italic)
		font += 'italic ';
	font += this.size + 'px ' + this.name;
	return font;
};


You should also set MeasureUnit to Pixel to avoid additional scale transform applied by the diagram.

I hope that helps,
Stoyan
  
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Al
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Re: Node text is always bold
Reply #10 - Nov 7th, 2014 at 1:27pm
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Thanks Stoyan, using GraphicsUnit.Pixel worked just fine - this won't cause any problems on different screen resolutions right?
  
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Stoyo
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Re: Node text is always bold
Reply #11 - Nov 7th, 2014 at 6:30pm
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pixel is supposed to be device-independent unit in browsers (see reply in http://stackoverflow.com/questions/21680629/getting-the-physical-screen-dimensio...), so it should not cause problems.

I hope that helps,
Stoyan
  
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