This exercise will build on the scale bar drawing we did earlier.

Download the drawing below into the iPad Photos app (tap and hold and select Save Image).

Trench 29 drawing 2

In iDraw, you can duplicate a file with the plus button in the lower right. Duplicate the scale bar drawing and rename it 29.1. You should already have a layer named scale bar. Make a new one named scan. You can put it below the scale bar layer if you want, but make sure that it is the active layer. Use the rightmost tool on the bottom tools to import the 29.2 drawing. By default it will be horizontal and take up the whole screen width (we are ignoring scale at this point and focusing on drawing practice). Use the blue handles (scale) and orange handles (rotate) to turn it and take-up most of the page (mine has north going to the bottom left for no particular reason). Make a new layer named Trench. You will make your drawing in this layer.

If you had Snap to Grid turned on, now would be a good time to turn it off (from the Gear menu at the top).

Take a look at the drawing for a moment. There is a mixture of solid and dashed lines. Plus, while most of the lines are straight some are not. Because of the mixed line types this will have to be drawn in pieces and will not be one shape.

Start with the three dotted lines. Draw them with the line tool, just making three swipes. Don’t be timid. Draw with confidence. Don’t worry if the line isn’t accurate at first. You can fix the start and end points with the move tool afterwards (select the move tool, then click the line and move the start and end points). Change the line quality with the inspector (the italic i inside the circle at the top). I am using 2 pt lines which are about the same thickness as the lines in the pencil drawing.

Now for the solid lines. Two of those are easy. Use the pen tool to make a polyline. That is, tap once and it starts a line. Tap again and it goes to that point. Tap again and you are making a polyline. Do the two straight sets like that. This is easiest to do if you zoom in as far as you can. For the third line (upper right) use the pencil tool and drag your finger along the line. You might have to change the line quality (thickness) to match your dotted lines.

Editing the polylines is fairly straightforward but takes practice. You can select the line you wish to edit with the move tool. Then tap on the pen tool and all of your points that make up that polyline will be available. The tool bar that pops up on the lower left will let  you add, move, or delete points on the polyline. You can move either the point itself, or the direction handles that change the curve of the line.

iDraw pen tool for editing polylines

Make a new layer for your text and labels. Since we are building one drawing on top of another this will make it easier for you to move or delete for the next homework.

This is my finished drawing from last spring. The elevation triangles are a leftover drawing convention from another project, but I found the elevation symbol in the original pencil drawing difficult to move without being able to group (which iDraw couldn’t do last year). But now that we can group, I will probably redo that symbol.

29.2 drawing by Wallrodt

Next we start adding SUs.

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