static void calc_dash_scaling(SkScalar* parallelScale, SkScalar* perpScale, const SkMatrix& viewMatrix, const SkPoint pts[2]) { SkVector vecSrc = pts[1] - pts[0]; SkScalar magSrc = vecSrc.length(); SkScalar invSrc = magSrc ? SkScalarInvert(magSrc) : 0; vecSrc.scale(invSrc); SkVector vecSrcPerp; vecSrc.rotateCW(&vecSrcPerp); viewMatrix.mapVectors(&vecSrc, 1); viewMatrix.mapVectors(&vecSrcPerp, 1); // parallelScale tells how much to scale along the line parallel to the dash line // perpScale tells how much to scale in the direction perpendicular to the dash line *parallelScale = vecSrc.length(); *perpScale = vecSrcPerp.length(); }
static void SquareCapper(SkPath* path, const SkPoint& pivot, const SkVector& normal, const SkPoint& stop, SkPath* otherPath) { SkVector parallel; normal.rotateCW(¶llel); if (otherPath) { path->setLastPt(pivot.fX + normal.fX + parallel.fX, pivot.fY + normal.fY + parallel.fY); path->lineTo(pivot.fX - normal.fX + parallel.fX, pivot.fY - normal.fY + parallel.fY); } else { path->lineTo(pivot.fX + normal.fX + parallel.fX, pivot.fY + normal.fY + parallel.fY); path->lineTo(pivot.fX - normal.fX + parallel.fX, pivot.fY - normal.fY + parallel.fY); path->lineTo(stop.fX, stop.fY); } }