104 lines
3.6 KiB
Text
104 lines
3.6 KiB
Text
#
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# canvas.draw library - compass rose module
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# created 12/2018 by jsb
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# WARNING: this is still under development, interfaces may change
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#
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var CompassRose = {
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VERSION: 1.0,
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Style: {
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new: func() {
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var obj = {
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parents: [CompassRose.Style, canvas.draw.marksStyle.new()],
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mark_count: 36, # number of marks, count = 360 / interval
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label_count: 12, # number of text labels (degrees), e.g. 12
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label_div: 10, # >0 divide degrees by this number for text label, e.g. 10
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circle_color: [255,255,255,1],
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mark_color: [255,255,255,1],
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label_color: [255,255,255,1],
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center_mark: 0, # draw a mark in the center of the rose
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fontsize: 0, # fontsize for labels
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nesw: 1, # replace labels 0,90,180,270 by N,E,S,W
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};
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obj.setMarkLength(0.1);
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obj.setSubdivisionLength(0.5);
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return obj;
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},
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setMarkCount: func(value) {
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me.mark_count = num(value) or 0;
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return me;
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},
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setLabelCount: func(value) {
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me.label_count = num(value) or 0;
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return me;
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},
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# divide course by this value before creating text label. (try 10, 1 or 0)
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setLabelDivisor: func(value) {
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me.label_div = num(value) or 10;
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return me;
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},
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setFontSize: func(value) {
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me.fontsize = num(value) or 26;
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return me;
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},
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},
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};
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# draw a compass rose
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# cgroup canvas group, marks and lables will be created as children
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CompassRose.draw = func(cgroup, radius, style=nil) {
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if (style == nil) {
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style = me.Style.new();
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}
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cgroup = cgroup.createChild("group", "compass-rose");
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if (style.center_mark) {
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var center = cgroup.createChild("path","center");
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var l = radius * 0.1;
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center.setStrokeLineWidth(1).setColor(style.circle_color)
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.moveTo(-l,0).line(2*l,0).moveTo(0,-l).line(0,2*l);
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}
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if (style.baseline_width > 0) {
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var c = cgroup.createChild("path", "circle");
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c.circle(radius)
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.setStrokeLineWidth(style.baseline_width)
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.setColor(style.circle_color);
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}
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if (style.mark_count > 0) {
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var marks = canvas.draw.marksCircular(cgroup, radius, 360 / style.mark_count, 0, 360, style);
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marks.setStrokeLineWidth(style.mark_width);
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}
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var fontsize = style.fontsize;
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if (style.fontsize == 0) {
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fontsize = math.round(math.sqrt(radius) * 1.4);
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}
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if (style.label_count > 0) {
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var labels = cgroup.createChild("group", "labels")
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.createChildren("text", style.label_count);
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var offset = (style.mark_offset < 0 ? -1 : 1) * style.mark_length * radius;
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var rot = 2*math.pi/style.label_count;
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forindex (i; labels) {
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var t = n = int(i*360 / style.label_count);
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if (style.label_div > 0) t = int(n / style.label_div);
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var txt = sprintf("%d", t);
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if (style.nesw) {
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if (n == 0) txt = "N";
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elsif (n == 90) txt = "E";
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elsif (n == 180) txt = "S";
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elsif (n == 270) txt = "W";
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}
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labels[i]
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.setText(txt)
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.setFontSize(fontsize)
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.setColor(style.label_color)
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.setAlignment("center-"~(style.mark_offset < 0 ? "top" : "bottom"))
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.setTranslation(0,-radius-offset)
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.setCenter(0,radius+offset)
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.setRotation(i*rot);
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}
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}
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return cgroup;
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};
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