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var printPath = require('./print-path');
var roundNumber = require("./round-number");
function drawBeam(renderer, params) {
if (params.beams.length === 0) return;
var pathString = "";
for (var i = 0; i < params.beams.length; i++) {
var beam = params.beams[i];
if (beam.split) {
var slope = getSlope(renderer, beam.startX, beam.startY, beam.endX, beam.endY);
var xes = [];
for (var j = 0; j < beam.split.length; j += 2) {
xes.push([beam.split[j], beam.split[j + 1]]);
}
for (j = 0; j < xes.length; j++) {
var y1 = getY(beam.startX, beam.startY, slope, xes[j][0]);
var y2 = getY(beam.startX, beam.startY, slope, xes[j][1]);
pathString += draw(renderer, xes[j][0], y1, xes[j][1], y2, beam.dy);
}
} else
pathString += draw(renderer, beam.startX, beam.startY, beam.endX, beam.endY, beam.dy);
}
var durationClass = ("abcjs-d" + params.duration).replace(/\./g, "-");
var klasses = renderer.controller.classes.generate('beam-elem ' + durationClass);
var el = printPath(renderer, {
path: pathString,
stroke: "none",
fill: renderer.foregroundColor,
'class': klasses
});
return [el];
}
function draw(renderer, startX, startY, endX, endY, dy) {
// the X coordinates are actual coordinates, but the Y coordinates are in pitches.
startY = roundNumber(renderer.calcY(startY));
endY = roundNumber(renderer.calcY(endY));
startX = roundNumber(startX);
endX = roundNumber(endX);
var startY2 = roundNumber(startY + dy);
var endY2 = roundNumber(endY + dy);
return "M" + startX + " " + startY + " L" + endX + " " + endY +
"L" + endX + " " + endY2 + " L" + startX + " " + startY2 + "z";
}
function getSlope(renderer, startX, startY, endX, endY) {
return (endY - startY) / (endX - startX);
}
function getY(startX, startY, slope, currentX) {
var x = currentX - startX;
return startY + x * slope;
}
module.exports = drawBeam;
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