CompassRose

Note  The canvas.draw was merged into FGDATA in 03/2020. You can test, improve and play around with it by downloading the CanvasDrawDev add-on.

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Introduction

Please have a look at Canvas draw library first.

CompassRose

draw()

draw(cgroup, radius, style=nil);

Draws a compass rose with given radius on an existing canvas group element given as cgroup. Marks and text labels are drawn as defined in style. A default style will be used if style is not given.

Style

The style class for CompassRose, derived from canvas.draw.marksStyle.

new()

return a new style hash

var myStyle = canvas.CompassRose.Style.new();

setMarkCount(value)

value number of marks on compass rose, default: 36

setLabelCount(value)

value number of text labels on compass rose to generate from course degrees, default: 12

setLabelDivisor(value)

value divide course degrees by this value to create text label, default: 10

setFontSize(value)

value fontsize for labels

{Note|This should be changed to scale with the radius parameter of the draw function.}}

Examples

Compass rose HSI style and ND style

Compass example with eight marks.

    # compass test
    var style_HSI = canvas.CompassRose.Style.new();
    style_HSI.setMarkLength(0.1)
        .setMarkOffset(-1)
        .setSubdivisions(1)
        .setSubdivisionLength(0.5);

    var style_NAV = canvas.CompassRose.Style.new();
    style_NAV.set("circle_width", 2)
        .setMarkOffset(1);
    
    var style_3 = canvas.CompassRose.Style.new();
    style_3.setMarkCount(8)
        .setLabelCount(8)
        .setLabelDivisor(1)
        .set("nesw", 0); # No label N,E,S,W instead of 0, 90, 180, 270 degree
        
    var compass1 = myRoot.createChild("group", "compass1");
    var compass2 = myRoot.createChild("group", "compass2");
    var compass3 = myRoot.createChild("group", "compass3");
    canvas.CompassRose.draw(compass1, 100, style_HSI).setTranslation(150, 250);
    canvas.CompassRose.draw(compass2, 140, style_NAV).setTranslation(150, 250);
    canvas.CompassRose.draw(compass3, 210, style_3).setTranslation(...);