Template:E 2D utilities: Difference between revisions
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<noinclude>Some [[Category:E]] library code for the [[Spiral]] and [[Zig Zag]] tasks. Perhaps ought to be put into generally available E data structure/math libraries. |
<noinclude>Some [[Category:E]] library code for the [[Spiral]] and [[Zig Zag]] tasks. Perhaps ought to be put into generally available E data structure/math libraries. |
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<lang e>/** Missing scalar multiplication, but we don't need it. */ |
</noinclude><lang e>/** Missing scalar multiplication, but we don't need it. */ |
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def makeVector2(x, y) { |
def makeVector2(x, y) { |
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return def vector { |
return def vector { |
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Revision as of 11:28, 25 July 2009
Some library code for the Spiral and Zig Zag tasks. Perhaps ought to be put into generally available E data structure/math libraries.
<lang e>/** Missing scalar multiplication, but we don't need it. */ def makeVector2(x, y) {
return def vector {
to x() { return x }
to y() { return y }
to add(other) { return makeVector2(x + other.x(), y + other.y()) }
to clockwise() { return makeVector2(-y, x) }
}
}
/** Bugs: (1) The printing is specialized. (2) No bounds check on the column. */ def makeFlex2DArray(rows, cols) {
def storage := ([null] * (rows * cols)).diverge()
return def flex2DArray {
to __printOn(out) {
for y in 0..!rows {
for x in 0..!cols {
out.print(<import:java.lang.makeString>.format("%3d", [flex2DArray[y, x]]))
}
out.println()
}
}
to get(r, c) { return storage[r * cols + c] }
to put(r, c, v) { storage[r * cols + c] := v }
}
}</lang>