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fgdata/Nasal/canvas/api/path.nas
Henning Stahlke 2eb4c78794 improve code readability
2020-04-30 08:59:25 +01:00

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#-------------------------------------------------------------------------------
# canvas.Path
#-------------------------------------------------------------------------------
# Class for an (OpenVG) path element on a canvas
#
var Path = {
# Path segment commands (VGPathCommand)
VG_CLOSE_PATH: 0,
VG_MOVE_TO: 2,
VG_MOVE_TO_ABS: 2,
VG_MOVE_TO_REL: 3,
VG_LINE_TO: 4,
VG_LINE_TO_ABS: 4,
VG_LINE_TO_REL: 5,
VG_HLINE_TO: 6,
VG_HLINE_TO_ABS: 6,
VG_HLINE_TO_REL: 7,
VG_VLINE_TO: 8,
VG_VLINE_TO_ABS: 8,
VG_VLINE_TO_REL: 9,
VG_QUAD_TO: 10,
VG_QUAD_TO_ABS: 10,
VG_QUAD_TO_REL: 11,
VG_CUBIC_TO: 12,
VG_CUBIC_TO_ABS: 12,
VG_CUBIC_TO_REL: 13,
VG_SQUAD_TO: 14,
VG_SQUAD_TO_ABS: 14,
VG_SQUAD_TO_REL: 15,
VG_SCUBIC_TO: 16,
VG_SCUBIC_TO_ABS: 16,
VG_SCUBIC_TO_REL: 17,
VG_SCCWARC_TO: 20, # Note that CC and CCW commands are swapped. This is
VG_SCCWARC_TO_ABS:20, # needed due to the different coordinate systems used.
VG_SCCWARC_TO_REL:21, # In OpenVG values along the y-axis increase from bottom
VG_SCWARC_TO: 18, # to top, whereas in the Canvas system it is flipped.
VG_SCWARC_TO_ABS: 18,
VG_SCWARC_TO_REL: 19,
VG_LCCWARC_TO: 24,
VG_LCCWARC_TO_ABS:24,
VG_LCCWARC_TO_REL:25,
VG_LCWARC_TO: 22,
VG_LCWARC_TO_ABS: 22,
VG_LCWARC_TO_REL: 23,
# Number of coordinates per command
num_coords: [
0, 0, # VG_CLOSE_PATH
2, 2, # VG_MOVE_TO
2, 2, # VG_LINE_TO
1, 1, # VG_HLINE_TO
1, 1, # VG_VLINE_TO
4, 4, # VG_QUAD_TO
6, 6, # VG_CUBIC_TO
2, 2, # VG_SQUAD_TO
4, 4, # VG_SCUBIC_TO
5, 5, # VG_SCCWARC_TO
5, 5, # VG_SCWARC_TO
5, 5, # VG_LCCWARC_TO
5, 5, # VG_LCWARC_TO
],
#
new: func(ghost)
{
var obj = {
parents: [Path, Element.new(ghost)],
_first_cmd: 0,
_first_coord: 0,
_last_cmd: -1,
_last_coord: -1
};
return obj;
},
# Remove all existing path data
reset: func {
me._node.removeChildren("cmd", 0);
me._node.removeChildren("coord", 0);
me._node.removeChildren("coord-geo", 0);
me._first_cmd = 0;
me._first_coord = 0;
me._last_cmd = -1;
me._last_coord = -1;
return me;
},
# Set the path data (commands and coordinates)
setData: func(cmds, coords) {
me.reset();
me._node.setValues({cmd: cmds, coord: coords});
me._last_cmd = size(cmds) - 1;
me._last_coord = size(coords) - 1;
return me;
},
setDataGeo: func(cmds, coords) {
me.reset();
me._node.setValues({cmd: cmds, "coord-geo": coords});
me._last_cmd = size(cmds) - 1;
me._last_coord = size(coords) - 1;
return me;
},
# Add a path segment
addSegment: func(cmd, coords...) {
var coords = _arg2valarray(coords);
var num_coords = me.num_coords[cmd];
if (size(coords) != num_coords) {
debug.warn("Invalid number of arguments (expected "~num_coords~")");
}
else {
me.setInt("cmd["~(me._last_cmd += 1)~"]", cmd);
for (var i = 0; i < num_coords; i += 1)
me.setDouble("coord["~(me._last_coord += 1)~"]", coords[i]);
}
return me;
},
addSegmentGeo: func(cmd, coords...) {
var coords = _arg2valarray(coords);
var num_coords = me.num_coords[cmd];
if (size(coords) != num_coords) {
debug.warn("Invalid number of arguments (expected "~num_coords~")");
}
else {
me.setInt("cmd["~(me._last_cmd += 1)~"]", cmd);
for (var i = 0; i < num_coords; i += 1)
me.set("coord-geo["~(me._last_coord += 1)~"]", coords[i]);
}
return me;
},
# Remove first segment
pop_front: func {
me._removeSegment(1);
},
# Remove last segment
pop_back: func {
me._removeSegment(0);
},
# Get the number of segments
getNumSegments: func() {
return me._last_cmd - me._first_cmd + 1;
},
# Get the number of coordinates (each command has 0..n coords)
getNumCoords: func() {
return me._last_coord - me._first_coord + 1;
},
# Move path cursor
moveTo: func me.addSegment(me.VG_MOVE_TO_ABS, arg),
move: func me.addSegment(me.VG_MOVE_TO_REL, arg),
# Add a line
lineTo: func me.addSegment(me.VG_LINE_TO_ABS, arg),
line: func me.addSegment(me.VG_LINE_TO_REL, arg),
# Add a horizontal line
horizTo: func me.addSegment(me.VG_HLINE_TO_ABS, arg),
horiz: func me.addSegment(me.VG_HLINE_TO_REL, arg),
# Add a vertical line
vertTo: func me.addSegment(me.VG_VLINE_TO_ABS, arg),
vert: func me.addSegment(me.VG_VLINE_TO_REL, arg),
# Add a quadratic Bézier curve
quadTo: func me.addSegment(me.VG_QUAD_TO_ABS, arg),
quad: func me.addSegment(me.VG_QUAD_TO_REL, arg),
# Add a cubic Bézier curve
cubicTo: func me.addSegment(me.VG_CUBIC_TO_ABS, arg),
cubic: func me.addSegment(me.VG_CUBIC_TO_REL, arg),
# Add a smooth quadratic Bézier curve
squadTo: func me.addSegment(me.VG_SQUAD_TO_ABS, arg),
squad: func me.addSegment(me.VG_SQUAD_TO_REL, arg),
# Add a smooth cubic Bézier curve
scubicTo: func me.addSegment(me.VG_SCUBIC_TO_ABS, arg),
scubic: func me.addSegment(me.VG_SCUBIC_TO_REL, arg),
# Draw an elliptical arc (shorter counter-clockwise arc)
arcSmallCCWTo: func me.addSegment(me.VG_SCCWARC_TO_ABS, arg),
arcSmallCCW: func me.addSegment(me.VG_SCCWARC_TO_REL, arg),
# Draw an elliptical arc (shorter clockwise arc)
arcSmallCWTo: func me.addSegment(me.VG_SCWARC_TO_ABS, arg),
arcSmallCW: func me.addSegment(me.VG_SCWARC_TO_REL, arg),
# Draw an elliptical arc (longer counter-clockwise arc)
arcLargeCCWTo: func me.addSegment(me.VG_LCCWARC_TO_ABS, arg),
arcLargeCCW: func me.addSegment(me.VG_LCCWARC_TO_REL, arg),
# Draw an elliptical arc (shorter clockwise arc)
arcLargeCWTo: func me.addSegment(me.VG_LCWARC_TO_ABS, arg),
arcLargeCW: func me.addSegment(me.VG_LCWARC_TO_REL, arg),
# Close the path (implicit lineTo to first point of path)
close: func me.addSegment(me.VG_CLOSE_PATH),
# Add a (rounded) rectangle to the path
#
# @param x Position of left border
# @param y Position of top border
# @param w Width
# @param h Height
# @param cfg Optional settings (eg. {"border-top-radius": 5})
rect: func(x, y, w, h, cfg = nil) {
var opts = (cfg != nil) ? cfg : {};
# resolve border-[top-,bottom-][left-,right-]radius
var br = opts["border-radius"];
if (typeof(br) == "scalar") {
br = [br, br];
}
var _parseRadius = func(id) {
if ((var r = opts["border-"~id~"-radius"]) == nil) {
# parse top, bottom, left, right separate if no value specified for
# single corner
foreach(var s; ["top", "bottom", "left", "right"]) {
if (id.starts_with(s~"-")) {
r = opts["border-"~s~"-radius"];
break;
}
}
}
if (r == nil) { return br; }
else if (typeof(r) == "scalar") { return [r, r]; }
else { return r; }
};
# top-left
if ((var r = _parseRadius("top-left")) != nil) {
me.moveTo(x, y + r[1]).arcSmallCWTo(r[0], r[1], 0, x + r[0], y);
}
else { me.moveTo(x, y); }
# top-right
if ((r = _parseRadius("top-right")) != nil) {
me.horizTo(x + w - r[0]).arcSmallCWTo(r[0], r[1], 0, x + w, y + r[1]);
}
else { me.horizTo(x + w); }
# bottom-right
if ((r = _parseRadius("bottom-right")) != nil) {
me.vertTo(y + h - r[1]).arcSmallCWTo(r[0], r[1], 0, x + w - r[0], y + h);
}
else { me.vertTo(y + h); }
# bottom-left
if ((r = _parseRadius("bottom-left")) != nil) {
me.horizTo(x + r[0]).arcSmallCWTo(r[0], r[1], 0, x, y + h - r[1]);
}
else { me.horizTo(x); }
return me.close();
},
# Add a (rounded) square to the path
#
# @param x Position of left border
# @param y Position of top border
# @param l length
# @param cfg Optional settings (eg. {"border-top-radius": 5})
square: func(x, y, l, cfg = nil) {
return me.rect(x, y, l, l, cfg);
},
# Add an ellipse to the path
#
# @param rx radius x
# @param ry radius y
# @param cx (optional) center x coordinate or vector [cx, cy]
# @param cy (optional) center y coordinate
ellipse: func(rx, ry, cx = nil, cy = nil) {
if (typeof(cx) == "vector") {
cy = cx[1];
cx = cx[0];
}
else {
cx = num(cx) or 0;
cy = num(cy) or 0;
}
me.moveTo(cx - rx, cy)
.arcSmallCW(rx, ry, 0, 2*rx, 0)
.arcSmallCW(rx, ry, 0, -2*rx, 0);
return me;
},
# Add a circle to the path
#
# @param r radius
# @param cx (optional) center x coordinate or vector [cx, cy]
# @param cy (optional) center y coordinate
circle: func(r, cx = nil, cy = nil) {
return me.ellipse(r, r, cx, cy);
},
setColor: func {
me.setStroke(_getColor(arg));
},
getColor: func {
me.getStroke();
},
setColorFill: func {
me.setFill(_getColor(arg));
},
getColorFill: func {
me.getColorFill();
},
setFill: func(fill) {
me.set("fill", fill);
},
setStroke: func(stroke) {
me.set("stroke", stroke);
},
getStroke: func {
me.get("stroke");
},
setStrokeLineWidth: func(width) {
me.setDouble("stroke-width", width);
},
# Set stroke linecap
#
# @param linecap String, "butt", "round" or "square"
#
# See http://www.w3.org/TR/SVG/painting.html#StrokeLinecapProperty for details
setStrokeLineCap: func(linecap) {
me.set("stroke-linecap", linecap);
},
# Set stroke linejoin
#
# @param linejoin String, "miter", "round" or "bevel"
#
# See http://www.w3.org/TR/SVG/painting.html#StrokeLinejoinProperty for details
setStrokeLineJoin: func(linejoin) {
me.set("stroke-linejoin", linejoin);
},
# Set stroke dasharray
#
# @param pattern Vector, Vector of alternating dash and gap lengths
# [on1, off1, on2, ...]
setStrokeDashArray: func(pattern) {
if (typeof(pattern) == "vector") {
me.set("stroke-dasharray", string.join(",", pattern));
}
else {
debug.warn("setStrokeDashArray: vector expected!");
}
return me;
},
# private:
_removeSegment: func(front) {
if (me.getNumSegments() < 1) {
debug.warn("No segment available");
return me;
}
var cmd = front ? me._first_cmd : me._last_cmd;
var num_coords = me.num_coords[me.get("cmd["~cmd~"]")];
if (me.getNumCoords() < num_coords) {
debug.warn("To few coords available");
}
me._node.removeChild("cmd", cmd);
var first_coord = front ? me._first_coord : me._last_coord - num_coords + 1;
for (var i = 0; i < num_coords; i += 1) {
me._node.removeChild("coord", first_coord + i);
}
if (front) {
me._first_cmd += 1;
me._first_coord += num_coords;
}
else {
me._last_cmd -= 1;
me._last_coord -= num_coords;
}
return me;
},
};
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