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Monday, June 17, 2013

How to draw teacups (and other ellipses)




This rambling text relates to these 3 images but they are not necessarily posted in order… I am not sure that you will all (or any of you!)  be able to make sense of it …but here goes

I have recently seen a few explanations of how to draw ellipses  by enclosing it in a square that is in perspective. I discovered that setup trick quite a few years back but it never really helped me draw teacups because I never setup a perspective for my tea cup sketches and it is hard to work out where the square is anyway. At one stage I had a little sheet of plastic I would put over the top of the cup to help me see the square…but that was SILLY (kept the tea warm though while I was draw the cup!)



Coincidentally around the time of those other explanations appeared, I happened to be doing my own crazy analysis of circles and centre-points. This was in preparation for the start of my class (way back in late April) I took some photos of a lid with  centre-points marked and tried to get a grip on how the  centre-point varied and with very inaccurate photos I did some crazily accurate measurement on my CAD programme. This was a true left brain moment!

I then had a total brain switch (to the right hand side) and thought.."the shape I am looking at is a true ellipse which is bounded by a rectangle and the centrepoint is in the centre. My head went into a spin and I need an emergency call to the perspective guru - Gerard. Anyway, he set me straight. But I didn't get around to putting it all together…or how to find a way to explain my dilemma about how the circle can have a different centre-point from the ellipse… but it normally does! (Gerard agrees!)



The long and the short of all this rambling is that totally regardless of my analysis…
to draw a tea cup all I do is
1. establish a vertical axis that will pass through the centre of cup rim, base and saucer
2. 'measure' the height and the width of the cup. And draw a cross-hair with these distances meeting at the centre-point.
3. Draw an ellipse connecting these points… if you need more set up- think of a squashed circle in a rectangle and use the 'little less than 3/4 rule for the diagonal)
4. do this for each of the edges of the cup/saucer
5. accept that they might be wonky… colour and pattern will make up for it!
Especially wonky to be expected if one draws slower than normal speed like I did here

Ok… have I confused everyone???

My best advise: go and make yourself a cup of tea and draw what you see!!!

6 comments:

  1. I will try you way of drawing tea cups tomorrow, it seems to make sense. Thank you.

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  2. Hi Liz.
    If you draw your rectangle, and inscribe diagonal lines first, their intersection will give you the position for the horizontal line - the widest part of the ellipse, and the vertical line. So you inscribe not just a cross but a union jack. You then mark a tangent at the point where each of these four line meet your rectangle and sketch the ellipse by connecting the tangents.
    Hard to explain without a sketch...
    The same system works brilliantly for doing a series of arches etc. though you'd only need part of the ellipse of course.

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  3. Yes, I am completely confused by all the geometric/mathematical lingo that I don't use regularly and thus, am not familiar with. I like your final instructions... draw what you see. ;)

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  4. such a beautiful spread! I need to get off here and go sketch!

    ReplyDelete

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