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This is progress. After all, if you want to build a house you go to the builders supply store and buy some bricks and some planks of wood. You don’t dig up clay and chop down trees. People better skilled than you at making bricks have made the bricks for you. People with better tools have made smooth straight wooden beams for you. You can focus on building a masterpiece. It’s the same when writing code.

With the region selected, click on the Resize button on the Painbrush toolbar and enter in the desired skew (in degrees) in the horizontal plane.

Below are rotations of a test card of random shapes (so you can see the effect of the shears), a Spitfire, and Tigger. For each image, I've shown the source, the results of applying the three shear matrices in order and, for comparison, the image produced by the standard 2D rotation matrix (sometimes called a rotation by selection).

Plus, it’s just fun to learn about! You might not make your own bricks, but it’s fun to watch How it’s made (Series 2 – Episode15)

Indulge me, however, as I reminisce. Back when I started programming games in 6502 assembly language, you had to do everything yourself.

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Multiplying by sines and cosines on the integer coordinates of the source image gives real number results, and these have to be rounded back to integers again to be plotted. Sometimes this number rounding means the same destination location is addressed more than once, and sometimes certain pixels are missed completely. When the pixels are missed, the background shows through. This is why there are holes.

What can we do about this? There are a variety of solutions. One of them is to oversample the source image. We can pretend that each of the original source pixels is really a grid of n x n smaller pixels (all of the same color), and calculate the destination coordinates of each of these subpixels and plot these.

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Select the image you want to rotate. The image is going to be rotated around the center of the selection. Make sure you leave sufficient space around the image for expansion as we distort the image.

These days, we’re spoiled with having super-fast processors and high-level libraries to do many things. Well, spoiled is not quite the correct verb, what I mean is that, unless you’re working on some core system code or an incredibly time sensitive component, you don’t have to code everything from scratch. Most of the time, this is a good thing; it means you can focus your brain cells on coding the problem, not on building the blocks.

A typical computer image these days uses 24 bits to represent the color of each pixel. Eight bits are used to store the intensity of the red part of a pixel (00000000 through 11111111), giving 256 distinct values. Eight bits are used to store the green component, and eight bits are used to store the blue component.

Do you still use Microsoft Paint, or some other under-powered paint package that does not allow you to rotate an image by an arbitrary angle? Ever been frustrated by this?

Here is our source image. By translating the coordinate frame we can place the origin at the centroid, and it is around this we will rotate it.

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I'm using a coin, on purpose, because it is circular and you can see the effects of the shears. We can also see, at the end, if there is any distortion.

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Using some High School geometry we can work out the relationship between the source coordinates (x,y) and the destination coordinates (x*,y*)

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What we need to do is take the RGB values at every (x,y) locatioon, rotate it as needed, and then write these values in the new location.

This one is easy. Click the Resize button once more and skew the image a negative number of degrees in the vertical plane.

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(Make sure your calculator is set into Degrees and in Scientific mode. Type in your rotation, hit the cos button, then x2 then 1/x button).

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(The math is modfied slightly because paint applies the actions to the selected region, not a centroid, but it's the same thing we are doing.)

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However, there is a more elegant method, and this is the method that was used many years ago when computing power (and memory) were at a premium and every processor cycle worth its weight in gold. It is called the three shear rotation method. It's so clever that it's worth sharing in full detail.

It's the same reason that we see jagged staircases on lines drawn on low resolution screens at angles other than horizontal and vertical. Raster screens are digital, and pixel boundaries are at quantized locations.

I’m not suggesting a Luddite revolution. I’m not suggesting that everyone should burn their libraries; far from it. Today’s coding masterpieces are architected on the shoulders of other building blocks.

A more refined way is called Area Mapping. For this, you invert the problem, and for each destination pixel, you find which four partial source pixels that it was created from. The color for the destination is calculated by the area-weighted average of the four source pixels (The source pixels that contribute more to the destination pixel have a greater influence on its color). This algorithm not only ensures that there are no gaps in the destination, but also appropriately averages the colors (ensuring both a smoother image and also keeping the average brightness of the rotated image constant).

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If you want to sort an array, you call a sort function. If you want a dialog box you call one up. If you want to rotate a bitmap, well, there’s a function for that.

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We can apply the three stage shear principle/concept we have just learned. The two basic tools provided to us in the paint package enable us to produce an arbitray rotation!

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As the shear happens in just one plane at time, and each stage is conformal in area, no aliasing gaps appear in any stage.

In times-past, when floating point and trig calculations were expensive, these properties were very important. Because only one plane was being modified at once, no additional memory was needed as the code could simple walk down the raster line making the changes it needed. Pretty cool.

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The (x,y) coordinates relative to the axes are the same; what we have done is rotate the coordinate frame of reference by an angle θ.

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Each pixel has a coordinate pair (x,y) describing its position on two orthogonal axes from defined origin O. It is around this origin we’re going to rotate our image.

The exact value to enter into this box is based on a calculaton. You'll need to use the forumla below to get a scaling factor, and round it to the nearest number.

Well, thankfully, Microsoft equipped paintbrush with a couple of useful functions, these are resize and shear (which they call skew)

However, an understanding about how things work will make you a better programmer. Knowing how an underlying function will process your data will help you design your data structures to be sympathetic. Knowing how a library function works under the covers will, one day, help you solve an analogous higher level problem sometime in the future.

The aliasing problem gets worse when angles are closesr to the diagonals. Here are a few examples of images at different rotations:

In the first shear operation, raster columns are simply shifted up and down relative to each other. The shearing is symmetric around the center of the image. It's analogous to shearing a deck of playing cards.

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