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Fixes for cubic bezier edges

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This commit is contained in:
Daniel Cohen Gindi 2016-09-21 19:55:58 +03:00
parent 63684f02ca
commit b1fe859ce8
1 changed files with 20 additions and 9 deletions
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29
MPChartLib/src/main/java/com/github/mikephil/charting/renderer/LineChartRenderer.java
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@ -199,22 +199,33 @@ public class LineChartRenderer extends LineRadarRenderer {
float curDx = 0f;
float curDy = 0f;
Entry prevPrev = dataSet.getEntryForIndex(mXBounds.min);
Entry prev = prevPrev;
Entry cur = prev;
Entry next = dataSet.getEntryForIndex(mXBounds.min + 1);
// 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
if (cur == null || next == null) return;
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 = dataSet.getEntryForIndex(j == 1 ? 0 : j - 2);
prev = dataSet.getEntryForIndex(j - 1);
cur = dataSet.getEntryForIndex(j);
next = mXBounds.max > j + 1 ? dataSet.getEntryForIndex(j + 1) : cur;
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;