Triangles #86
Triangles #86
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Thanks for the PR! I've left a preliminary review, and I'll test the simulator examples when I'm next at a Linux machine. Can you add a Triangle bullet to the Primitives list on the docs homepage please?
If a line has zero length, surely it shouldn't be drawn at all? What's the current behaviour in Embedded Graphics for this? Is there an established/expected behaviour from the wider graphics community?
Don't worry about stroke width - that's something that needs to be fixed for the line primitive as well!
| d, | ||
| s, | ||
| err: d[0] + d[1], | ||
| e2: 0, |
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I think these single letters are from Bresenham's algorithm, no? Can you give d, s and e2 more descriptive names please?
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should be fixed now
simulator/src/lib.rs
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| @@ -107,7 +107,7 @@ pub struct DisplayBuilder { | |||
| impl DisplayBuilder { | |||
| pub fn new() -> Self { | |||
| Self { | |||
| width: 256, | |||
| width: 320, | |||
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Why does this need to change?
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I added triangles to the stroke example and wanted to make them fit into the window. I didn't realize that this should be done in the example itself. Should be fixed with my last commit.
Done
I didn't put much thought in that. I think the behaviour should not be changed. So zero length lines should no longer be drawn.
Lines with a stroke width are rectangles. If the triangle solution is stable enough, it could be reused for lines and polygons. |
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Released in 0.4.8. |
I added an iterator which can draw triangles. It uses the line iterator, to draw the edges. To fill the triangle I start to draw the edges at the top left corner and fill the space between the points on the edge.
Because the current way of drawing lines not always starts drawing at the start point, I had to reimplement the line drawing algorithm.
There are some issues with my triangle implementation. First issue is that triangles have no stroke width. The second issue is that the triangle iterator returns some points multiple times. The corner point e.g. are return at least twice because they are part of two edges which are drawn separately.