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'use strict';
var defaults = require('../core/core.defaults');
var Element = require('../core/core.element');
var helpers = require('../helpers/index');
var valueOrDefault = helpers.valueOrDefault;
var defaultColor = defaults.global.defaultColor;
defaults._set('global', {
elements: {
line: {
tension: 0.4,
backgroundColor: defaultColor,
borderWidth: 3,
borderColor: defaultColor,
borderCapStyle: 'butt',
borderDash: [],
borderDashOffset: 0.0,
borderJoinStyle: 'miter',
capBezierPoints: true,
fill: true, // do we fill in the area between the line and its base axis
}
}
});
module.exports = Element.extend({
draw: function() {
var me = this;
var vm = me._view;
var ctx = me._chart.ctx;
var spanGaps = vm.spanGaps;
var points = me._children.slice(); // clone array
var globalDefaults = defaults.global;
var globalOptionLineElements = globalDefaults.elements.line;
var lastDrawnIndex = -1;
var index, current, previous, currentVM;
// If we are looping, adding the first point again
if (me._loop && points.length) {
points.push(points[0]);
}
ctx.save();
// Stroke Line Options
ctx.lineCap = vm.borderCapStyle || globalOptionLineElements.borderCapStyle;
// IE 9 and 10 do not support line dash
if (ctx.setLineDash) {
ctx.setLineDash(vm.borderDash || globalOptionLineElements.borderDash);
}
ctx.lineDashOffset = valueOrDefault(vm.borderDashOffset, globalOptionLineElements.borderDashOffset);
ctx.lineJoin = vm.borderJoinStyle || globalOptionLineElements.borderJoinStyle;
ctx.lineWidth = valueOrDefault(vm.borderWidth, globalOptionLineElements.borderWidth);
ctx.strokeStyle = vm.borderColor || globalDefaults.defaultColor;
// Stroke Line
ctx.beginPath();
lastDrawnIndex = -1;
for (index = 0; index < points.length; ++index) {
current = points[index];
previous = helpers.previousItem(points, index);
currentVM = current._view;
// First point moves to it's starting position no matter what
if (index === 0) {
if (!currentVM.skip) {
ctx.moveTo(currentVM.x, currentVM.y);
lastDrawnIndex = index;
}
} else {
previous = lastDrawnIndex === -1 ? previous : points[lastDrawnIndex];
if (!currentVM.skip) {
if ((lastDrawnIndex !== (index - 1) && !spanGaps) || lastDrawnIndex === -1) {
// There was a gap and this is the first point after the gap
ctx.moveTo(currentVM.x, currentVM.y);
} else {
// Line to next point
helpers.canvas.lineTo(ctx, previous._view, current._view);
}
lastDrawnIndex = index;
}
}
}
ctx.stroke();
ctx.restore();
}
});