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Drawing lines is very straightforward, but there are three things to consider: the line weight or thickness, the angle of constrain, and whether or not you want to add arrowheads to your lines. Firstly the line weight, currently 1 pixel. If I draw myself a 1 pixel weight line, it's going to look like that and I cannot change the weight of that line after I've drawn it. Unless I were to come to my Layers Effects and add an additional stroke weight to that line. That would do it, but it's better to get the line weight correct to begin with.
So I'm going to undo that by pressing Command+Z or Ctrl+Z and now I'm going to increase the line weight by pressing my right bracket to increase the line weight. In addition, if I wanted to draw my lines constrain to increments of 45 degrees, either straight or diagonal, I would hold down my Shift key. Now here is something to watch out for, because if I hold down my Shift key and draw another line and I start with my Shift key held down, Photoshop is going to interpret that as me wanting to add the second line to this existing shape layer.
You can now see we have two lines, if you look at the vector mask thumbnail. If that's not what I want, and actually it's not what I want, then start drawing the line, then hold down the Shift key, and that's going to create you a new shape layer. The third point I want to make about drawing lines is the ability to add arrowheads to them. Unfortunately you cannot add arrowheads after the effects, you need to get this right to begin with, and you do this through the star fish looking like tool up here, and I'm going to add arrowheads at the start.
I find this a little bit counterintuitive, because you if I add arrowheads at the start, that doesn't mean it's going to add an arrowhead in the direction that I'm dragging. Quite the opposite. So if you want to add an arrowhead in the direction that you're dragging, which seems more likely, then you actually want arrowheads at the end. If you want to make the arrowhead curved, then you want some concavity. I'm going to change the Concavity to 50%, and if I only want the-- in this case, the arrowhead as long as it is wide, I'm going to make that percentage the same, 500%.
So now I can drag an arrowhead in the direction that I'm dragging and it would look like that. So, some simple things to consider, but not to be overlooked when working with lines. The line weight or thickness, the angle of constrain, and whether or not you want to add arrowheads.
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