mRenderPaint.setPathEffect(null); }
private void drawGradientCubicBezier(ILineDataSet dataSet) {
float phaseY = mAnimator.getPhaseY();
Transformer trans = mChart.getTransformer(dataSet.getAxisDependency());
mXBounds.set(mChart, dataSet);
float intensity = dataSet.getCubicIntensity();
cubicPath.reset();
if (mXBounds.range >= 1) {
float prevDx = 0f; float prevDy = 0f; float curDx = 0f; float curDy = 0f;
// Take an extra point from the left, and an extra from the right. // That's because we need 4 points for a cubic bezier (cubic=4), otherwise we get lines moving and doing weird stuff on the edges of the chart. // So in the starting `prev` and `cur`, go -2, -1 // And in the `lastIndex`, add +1
final int firstIndex = mXBounds.min + 1; final int lastIndex = mXBounds.min + mXBounds.range;
Entry prevPrev; Entry prev = dataSet.getEntryForIndex(Math.max(firstIndex - 2, 0)); Entry cur = dataSet.getEntryForIndex(Math.max(firstIndex - 1, 0)); Entry next = cur; int nextIndex = -1;
if (cur == null) return;
// let the spline start cubicPath.moveTo(cur.getX(), cur.getY() * phaseY);
for (int j = mXBounds.min + 1; j <= mXBounds.range + mXBounds.min; j++) {
prevPrev = prev; prev = cur; cur = nextIndex == j ? next : dataSet.getEntryForIndex(j);
nextIndex = j + 1 < dataSet.getEntryCount() ? j + 1 : j; next = dataSet.getEntryForIndex(nextIndex);
prevDx = (cur.getX() - prevPrev.getX()) * intensity; prevDy = (cur.getY() - prevPrev.getY()) * intensity; curDx = (next.getX() - prev.getX()) * intensity; curDy = (next.getY() - prev.getY()) * intensity;
cubicPath.cubicTo(prev.getX() + prevDx, (prev.getY() + prevDy) * phaseY, cur.getX() - curDx, (cur.getY() - curDy) * phaseY, cur.getX(), cur.getY() * phaseY); } }
// if filled is enabled, close the path if (dataSet.isDrawFilledEnabled()) {
cubicFillPath.reset(); cubicFillPath.addPath(cubicPath);
drawCubicFill(mBitmapCanvas, dataSet, cubicFillPath, trans, mXBounds); }
mRenderPaint.setStyle(Paint.Style.STROKE);
trans.pathValueToPixel(cubicPath);
LinearGradient linGrad = new LinearGradient(0, 0, 0, mChart.getHeight(), dataSet.getGradientColor().getStartColor(), dataSet.getGradientColor().getEndColor(), Shader.TileMode.REPEAT); mRenderPaint.setShader(linGrad);
mBitmapCanvas.drawPath(cubicPath, mRenderPaint);
mRenderPaint.setPathEffect(null); }