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Much as with the composition tools that you find in professional painting programs, if you want to use any of the more complex options like the blending choices, you ll probably need to test things out until you get a result you like.
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Clipping paths Clipping paths are much easier to figure out without seeing them first. They work as part of the path-creation tools that we discussed in section 6.2. You start a path with beginPath, and then you use any number of lines, moves, arcs, or Bezier curves to draw. But when you re done, instead of using the stroke or fill methods, you use the clip method. Instead of drawing the path, Canvas uses clip to bound what s drawn afterward. The following example shows a circle being used as a clipping path, restricting the square that s drawn under it:
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context.beginPath(); context.arc(100,250,50,0,360*Math.PI/180,'true'); context.clip(); context.fillStyle = 'gray'; context.fillRect(50,230,100,100);
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The square is thus drawn only inside the arc. The result is similar to what you can get with the globalCompositeOperation values that make one shape dominant over another, but we find clipping to be a more intuitive method. You don t have a bunch of weird names to remember, and it s more obvious that you re creating a specific shape to clip whatever appears after it. The results of this simple clipping are shown in figure 6.8. Before we finish our look at Canvas basics, we re Figure 6.8 A circle clips the going to cover two last methods you can use to change filled rectangle drawn after it. the basics of a drawing.
Transforming and restoring
By now you ve probably figured out that Canvas is a pretty fully featured scalable vector graphics program. You don t just have basic functionality, but also a lot of subtlety. Here we re going to cover the last two methods that you can use to really change the basics of your drawing: transformations and state stacking.
Transformations Transformations are operations that allow you to change the grid that you re drawing on in various fundamental ways. There are three simple transformation methods, as described in table 6.9. These methods should all work as advertised. Note that the rotate method uses radians, as usual. You can make transformations, change them, and reverse them, as you see fit. The following line, for example, would move our origin to the center of our 320x356 grid:
Context.translate(160,178)
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Table 6.9 Method Transformations allow you to move your origin or change your grid. Type Transformation method Transformation method Transformation method Variable x,y angle xmult,ymult Summary Moves the canvas origin to x,y Rotates the canvas by angle Scales the canvas x in width, y in height
translate rotate scale
This is another area where the next question is probably: why These transformations are solely intended to make your drawing code easier to write. Certain symmetrical shapes might be easier to draw if you center them on the origin, so you might use translate. Similarly, rotate could make it easier to draw a symmetrical array of shapes. Finally, scale could be useful if you want to draw something notably larger or smaller than the rest of your canvas.
State stacking In these last three sections we ve covered quite a few fundamental tools that you can use to create your graphics: fill styles, stroke styles, line styles, global composition variables, global alpha variables, clipping paths, and transformations. Piling all of these Canvas changes together can get confusing; worse, they can really limit the order in which you can do things. Fortunately, there s a way that you can save the current state of these global variables and later restore them. It uses two methods, as described in table 6.10.
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