IMO, CGImage drawing methods are not implemented with GPU.I think I read mentioning about this on Apple's documentation, but I can't remember where. So I'm not sure about this. Anyway I believe CGImage is implemented in CPU because,

Meanwhile, I created these useful functions in a utility class that I use in my apps. It creates a UIImage from part of another UIImage, with options to rotate, scale, and flip using standard UIImageOrientation values to specify.


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Here contentFrame is normalized frame relative to real UIImage size.So, "0" means that we start visible part of image from left border,"0.25" means that we have vertical offset 100,"1" means that we want to show full width of the image,and finally, "0.25" means that we want to show only 1/4 part of image in height.

Don't use canvas for custom painting in java. use JComponent or JPanel instead. It has a nice function paintComponent(Graphics g), override it and paint your image inside with g.drawImage(x, y, width, height, observer);

You can scale or draw a part of an image using Graphics.drawImage as mentioned another answer and according to Java documentation, ImageObserver argument is not needed for BufferedImage so you can just pass null.

Countryside and urban landscape are full of inspiration for the artist. Here in the UK, days are lengthening and weather is (sometimes) dry, so this is a great time to consider heading outdoors to draw.

To get started, you really only need a sketchbook (or other drawing paper) and a pen or pencil. However, I suggest packing a few other bits and pieces to keep you comfortable during your drawing session:

Now tackle the drawing with pen. I suggest an approach similar to that used by Vincent van Gogh in many of his drawings. Work across the landscape, using whichever pen marks you choose (dots, sweeping strokes, etc.) to suggest the slope or direction of the land and the texture of the surface. Keep your pen marks lively. We are not trying to convey the effects of light here, so laborious cross-hatching or shading are not required.

Taking this idea further: You may wish to develop this idea by drawing in colour. Feel free to use the same linear style as described above, this time working in coloured inks, coloured pens or pencils. If you wish, you may choose colours to help emphasise a sense of distance (cool colours tend to recede, while warm ones come forward). Your colours may be based on those of the landscape itself, or you may opt for a more experimental approach, with colour providing a sense of emotion.

Each tree has its own unique structure depending not only on its species but also on its history, the prevailing wind and so on. They are just as worthwhile to draw as a human or animal figure though, of course, they will neither walk away nor charge you by the hour.

The general structure of the tree should be drawn out before considering adding small details. If attempting to draw the entire tree, do step back far enough so that you can see the entire structure without moving your head, even if this means working from the opposite end of the field.

1) In graphite, pencil or pen. Using the whole double-page spread of your sketchbook, sketch the tree very rapidly using a continuous-line technique, i.e. do not lift your drawing tool off the paper form start to finish. You should end up with a flowing image with an intuitive quality.

2) In pencil, charcoal or graphite, use a more careful, structural approach to drawing a tree. Work much more slowly (e.g. over a period of 40-60 minutes). Make multiple measurements using your outstretched arm to check the proportions of trunk, main branches and masses of foliage, and estimate angles of the main branches. Use the tip of your charcoal or graphite stick to draw edges in once you have worked out where they should go. As you build this drawing up, turn the charcoal or graphite on its side to block in regions of dark tone if you wish.

3) In any medium of your choice, draw from the tree using a mixture of careful measuring marks and more intuitive, flowing lines. A tree that is growing at an unusual angle is a good one to draw to start with. Leave about 30 minutes for this drawing as it is better left uncompleted than overworked. I suggest starting by making a few measurements and checking how your tree will fit onto your paper. Work into the drawing more boldly to emphasise the direction of the trunk and branches and perhaps to suggest movement if it is a windy day.

I never wrote any of this down, it just came back to me looking at the drawings. The theory behind the monsters is pretty good but there is otherwise no plot, just geopolitics and world building. It is very much the work of a kid, a bookish kid with a depressive personality, to be exact.

People sometimes ask me about my drawing process, so here are some details.I started out drawing on paper, with sharpies, and then using a scanner to digitise them.It worked, but it was labour-intensive, and I could only do it at home. No last minute revisions to the slides for me.Not that I would ever leave a presentation to the last minute. Obviously.

Gameplay in DOP: Draw One Part goes like this: on each level, you'll see a drawing with one part missing. For example, you might see a donut without a hole, a chair without a leg, a frying pan without a handle, and so on. Your job is to decide what the drawing is missing and then complete it.

To add to the drawing, just draw the missing part with your finger by dragging it across the screen as you see fit. If you do it correctly, the game's AI will accept your addition and advance you to the next level. The first few levels are pretty simple, just requiring chicken scratch for a chair leg or a simple circle for the donut hole. But as you advance, things will get more complicated.

I have a nice tft I want to use it as a timer.

First I draw a full circle, than I want to gradualy fill the circle as time passes by. For that I need to be able to draw a partial circle, who knows how to do that?

In part one, we looked at drawing with graphite pencils and examined different methods of shading in order to make our drawings look three dimensional. I suggested that you had a go at making a drawing of the little New Zealand Maori house from the photograph provided; trying to use some of the shading techniques we looked at. Figure 1 shows you my drawing of this subject together with the original reference photo. I have listed some of the shading patterns I used. How did you get on? Did you remember to start your sketch by drawing "from the outside in"? In other words, drawing the biggest shapes first, and then gradually working your way down to the smallest details. This enables you to scale your drawing and sit it comfortably on the page

Drawing solely with one colour enables you to really concentrate on your tonal values. Soft lines with very little detail in the distance and stronger darker tones with greater detail in the foreground. Experiment with different pencils, some soft, some hard. Let them work for you in producing both light and dark lines. It's difficult to get the depth of shading you want with just one grade of pencil. Many drawings and paintings don't work as well as they could because the tonal values are incorrect.

Now that we have done a little work with graphite pencils, we move on and look at watersoluble graphite. I absolutely love this drawing medium as it is so versatile. It is the perfect combination between drawing and painting. Watersoluble graphite comes in various forms: pencils, pots and sticks. It's purely down to choice of, either working mainly with a paintbrush or with a combination of pencils and a brush. The graphite works in the same way whichever method you choose. However, for the purpose of this article, we will just look at the watersoluble graphite in pencil form. Similarly to ordinary everyday graphite sketching pencils, we don't need to purchase very many. In fact just three are quite sufficient. Again, the watersoluble pencils are graded according to their degree of softness. The ones I have chosen are Derwent Watersoluble Sketching Pencils. There are six pencils in the tin, two light wash, two medium wash and two dark wash. They also come with a pencil sharpener but I prefer to sharpen my pencils with a craft knife. The Derwent pencils have a little symbol that tells you that the pencils are watersoluble. Very useful when your pencils are on your workbench amongst other drawing materials. We will look at different ways of using this medium, try some simple sketches and also add a little colour to our pictures.

The marks made by watersoluble graphite pencils look exactly like ordinary graphite pencils when you first draw with them. However, as soon as you wet your drawing the graphite moves like watercolour. Figure 3 shows you the difference in the light, medium and dark washes. You can get really strong darks with the softest pencil. If you want a very softly shaded area with no line showing, use a wet brush to take the graphite directly off the tip of the pencil. Alternatively, scrape a few flakes into a palette, wet them and use the mix like paint.

When you make your sketches or drawings, you don't have to wet and blend every line. Leave some marks as they were when first drawn. Start with a soft outline and the first layer of shading using the light wash pencil, wet your lines and blend where needed. Remember to leave any areas that you want to show as white paper for highlights. Let this layer dry completely. Now go over your work again with the medium wash pencil to add more contrast. Let this layer dry. Now use your dark wash pencil to punch in some strong contrasts where needed. Look at figures 4a and 4b which show you two very simple little sketches using all three pencils. Some lines have been blended with water and some have not. Always lay down less graphite than you think you need, you can easily add more. 2351a5e196

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