I would like to use something like Point[x,y] to plot diamonds instead of small circles ("points"). I'm creating charts from scratch inside a Graphics expression using my own graphics functions. I've looked through the documentation and questions here and haven't found anything about how to do it.
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$\begingroup$ Have you looked at this? $\endgroup$ – m_goldberg Aug 10 '14 at 16:39
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$\begingroup$ I've seen your icon, but it hadn't registered as an example of what I wanted to do. Did you use translate? $\endgroup$ – George Wolfe Aug 10 '14 at 16:43
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$\begingroup$ Sorry, I don't understand what you mean by "your icon". I gave a link to a previous posted question that I think relevant to yours. $\endgroup$ – m_goldberg Aug 10 '14 at 16:47
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$\begingroup$ @m_goldberg I believe he meant your SE avatar which is automatically generated. It has some rhombi in its corners. $\endgroup$ – Jens Aug 10 '14 at 23:13
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I use Translate for this purpose, which can not only translate along a single vector, but can create multiple copies translated along different vectors.
For example, let's use these (relative) positions:
points = RandomReal[10, {10, 2}]
Then
Graphics[
Translate[Triangle[], points]
]
Just make sure that your source object is centred around {0,0}, otherwise the plot will be misaligned, like here:
Graphics[
{Translate[Triangle[], points],
Red, PointSize[Large], Point[points]}
]
I was just lazy to make a proper diamond so I use Triangle ...
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Graphics[Translate[Rotate[Rectangle[], 45 Degree], points]]for diamonds? $\endgroup$ – kglr Aug 10 '14 at 16:19 -
$\begingroup$ @kguler That is not centred on
{0,0}, so we get back to me being lazy to make a proper diamond ;-) $\endgroup$ – Szabolcs Aug 10 '14 at 16:22 -
$\begingroup$ @Szabolcs Yet another function I didn't know about. Translate seems pretty handy. It seems like it should work. $\endgroup$ – George Wolfe Aug 10 '14 at 16:38
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I would define a function diamond that draws diamonds centered at given point and with a specified bounding box.
diamond[xy : {x_, y_} : {0, 0}, wh : {w_, h_} : {1, 1}] :=
Translate[Polygon[{{w/2., 0.}, {0., h/2.}, {-w/2., 0}, {0., -h/2.}}], xy]
Graphics[
Table[{Hue[RandomReal[]], diamond[RandomReal[1, {2}], RandomReal[.2, {2}]]}, {200}]]
answered Aug 10 '14 at 17:12
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$\begingroup$ How does the syntax [xy : {x_, y_} : {0, 0} work? Is it like a chain of defaults? $\endgroup$ – George Wolfe Aug 11 '14 at 0:22
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2$\begingroup$ @GeorgeWolfe. It does look like a chain of defaults, but it isn't. The full-form of the first argument to
diamondisOptional[Pattern[xy, List[Pattern[x, Blank[]], Pattern[y, Blank[]]]], List[0, 0]], so it can be read(<pattern-name> : <pattern>) : <default>. Colon ( : ) is one of few operators in Mathematica that is interpreted differently according to context. The first colon is interpreted as the infix form ofPatternand the second as the infix form ofOptional. $\endgroup$ – m_goldberg Aug 11 '14 at 2:56
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here some examples how to define your own PlotMarkers
plotmarkers =
colors //
Map[Graphics[{#, Disk[]}, ImageSize -> 8] //
ToString[#, FormatType -> StandardForm] & // Function, #] &
ListPlot[{{1, 2, 3, 5, 8}, {2, 3, 6, 9, 10}, {4, 5, 7, 10, 12}},
PlotMarkers -> plotmarkers, PlotRange -> All,
PlotRangeClipping -> False]
plotmarkers = {Style["\[FilledDiamond]", 16, Lighter@Red],
Style["\[FilledDiamond]", 16, Lighter@Blue],
Style["\[FilledDiamond]", 16, Lighter@Green]}
ListPlot[{{1, 2, 3, 5, 8}, {2, 3, 6, 9, 10}, {4, 5, 7, 10, 12}},
PlotMarkers -> plotmarkers, PlotRange -> All,
PlotRangeClipping -> False]
You may use Inset or Text to place them accordingly in Graphics, or if available the Option PlotMarkers -> yourPlotmarkers
plotmarkers = {Style["\[FilledDiamond]", 16, Lighter@Red],
Style["\[FilledDiamond]", 16, Lighter@Blue],
Style["\[FilledDiamond]", 16, Lighter@Green]}
point[x_, y_, which_] := Inset[plotmarkers[[which]], {x, y}]
Graphics[{point[1, 0, 1], point[-1, 0, 1], point[0, 1, 2],
point[0, -1, 2], point[0, 0, 3]}]
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$\begingroup$ +1 Pity that you don't show that the green diamond is at (0,0) :) $\endgroup$ – eldo Aug 10 '14 at 17:15
