I can't wrap my head around how to draw straight with the AP Brush. I know it involves using the Shift Key, but I am not sure how to start the line, or how to continue the line. If I: 1. Choose the Brush 2. Pick the color. 3. But after that I am not sure when to click the brush or hold shift. Normally I, after step 2 I Click the Brush, Hold Shift, Click the Brush, ending the brush line. But that doesn't always work with Affinity Photo. Sometimes I must click around the area to start the line, erase, then start the line once again. Sometimes when I click the brush, AP will draw across the page where I once drew with the brush.
Can anyone please tell me how to draw a straight line everytime in Affinity Photo. It can't be this difficult. Or can it?