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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ .pragma library
++
++ function renderSmoothedLine(ctx, trace, renderPos) {
++
++ if (!trace)
++ return renderPos
++
++ if (renderPos >= trace.length)
++ return renderPos
++
++ // Fetch points and draw the initial "dot"
++ var points, tp
++ if (renderPos === 0) {
++ points = trace.points()
++ tp = points[renderPos++]
++ ctx.beginPath()
++ ctx.moveTo(tp.x, tp.y)
++ ctx.lineTo(tp.x, tp.y + 0.000001)
++ ctx.stroke()
++ } else {
++ points = trace.points(renderPos - 1)
++ }
++
++ // Draw smoothed line using quadratic curve
++ var i = 1
++ if (i + 1 < points.length) {
++ var pt1, pt2
++ if (renderPos === 1) {
++ tp = points[i - 1]
++ } else {
++ pt1 = points[i - 1]
++ pt2 = points[i]
++ tp = Qt.point((pt1.x + pt2.x) / 2, (pt1.y + pt2.y) / 2)
++ }
++ ctx.beginPath()
++ ctx.moveTo(tp.x, tp.y)
++ while (i + 1 < points.length) {
++ pt1 = points[i++]
++ pt2 = points[i]
++ tp = Qt.point((pt1.x + pt2.x) / 2, (pt1.y + pt2.y) / 2)
++ ctx.quadraticCurveTo(pt1.x, pt1.y, tp.x, tp.y)
++ ctx.moveTo(tp.x, tp.y)
++ }
++ ctx.stroke()
++ }
++
++ // Draw the remainder of the line
++ if (trace.final) {
++ if (i < points.length) {
++ tp = points[i - 1]
++ ctx.beginPath()
++ ctx.moveTo(tp.x, tp.y)
++ tp = points[i++]
++ ctx.lineTo(tp.x, tp.y)
++ ctx.stroke()
++ }
++ }
++
++ return renderPos + i - 1
++ }