last argument pie=true makes arc to pie shape.
Change-Id: I6f22d00fed77bf728a4ff6e5f1ca42f476ac1664
//Shape
Result appendRect(float x, float y, float w, float h, float rx, float ry) noexcept;
Result appendCircle(float cx, float cy, float rx, float ry) noexcept;
- Result appendArc(float x, float y, float w, float h, float startAngle, float sweep) noexcept;
+ Result appendArc(float cx, float cy, float radius, float startAngle, float sweep, bool pie) noexcept;
Result appendPath(const PathCommand* cmds, uint32_t cmdCnt, const Point* pts, uint32_t ptsCnt) noexcept;
//Stroke
TVG_EXPORT Tvg_Result tvg_shape_close(Tvg_Paint* paint);
TVG_EXPORT Tvg_Result tvg_shape_append_rect(Tvg_Paint* paint, float x, float y, float w, float h, float rx, float ry);
TVG_EXPORT Tvg_Result tvg_shape_append_circle(Tvg_Paint* paint, float cx, float cy, float rx, float ry);
-TVG_EXPORT Tvg_Result tvg_shape_append_arc(Tvg_Paint* paint, float x, float y, float w, float h, float startAngle, float sweep);
+TVG_EXPORT Tvg_Result tvg_shape_append_arc(Tvg_Paint* paint, float cx, float cy, float radius, float startAngle, float sweep, uint8_t pie);
TVG_EXPORT Tvg_Result tvg_shape_append_path(Tvg_Paint* paint, const Tvg_Path_Command* cmds, uint32_t cmdCnt, const Tvg_Point* pts, uint32_t ptsCnt);
TVG_EXPORT Tvg_Result tvg_shape_set_stroke_width(Tvg_Paint* paint, float width);
TVG_EXPORT Tvg_Result tvg_shape_set_stroke_color(Tvg_Paint* paint, uint8_t r, uint8_t g, uint8_t b, uint8_t a);
return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendRect(x, y, w, h, rx, ry);
}
-TVG_EXPORT Tvg_Result tvg_shape_append_arc(Tvg_Paint* paint, float x, float y, float w, float h, float startAngle, float sweep)
+TVG_EXPORT Tvg_Result tvg_shape_append_arc(Tvg_Paint* paint, float cx, float cy, float radius, float startAngle, float sweep, uint8_t pie)
{
- return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendArc(x, y, w ,h, startAngle, sweep);
+ return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendArc(cx, cy, radius, startAngle, sweep, pie);
}
TVG_EXPORT Tvg_Result tvg_shape_append_circle(Tvg_Paint* paint, float cx, float cy, float rx, float ry)
return Result::Success;
}
-Result Shape::appendArc(float x, float y, float w, float h, float startAngle, float sweep) noexcept
+Result Shape::appendArc(float cx, float cy, float radius, float startAngle, float sweep, bool pie) noexcept
{
const float M_PI_HALF = M_PI / 2.0;
- const float radius = w / 2;
-
- Point center = {x + radius, y + radius};
auto impl = pImpl.get();
+ //just circle
+ if (sweep >= 360) return appendCircle(cx, cy, radius, radius);
+
startAngle = (startAngle * M_PI) / 180;
sweep = sweep * M_PI / 180;
- auto nCurves = ceil(sweep / M_PI_HALF);
+ auto nCurves = ceil(sweep / M_PI_HALF);
auto fract = fmod(sweep, M_PI_HALF);
fract = (fract < std::numeric_limits<float>::epsilon()) ? M_PI_HALF : fract;
+ //Start from here
+ Point start = {radius * cos(startAngle), radius * sin(startAngle)};
+
+ if (pie) {
+ impl->path->moveTo(cx, cy);
+ impl->path->lineTo(start.x + cx, start.y + cy);
+ }else {
+ impl->path->moveTo(start.x + cx, start.y + cy);
+ }
+
for (int i = 0; i < nCurves; ++i) {
- //bezier parameters
- Point start = {0, 0};
- Point end = {0, 0};
- Point bControl1 = {0, 0};
- Point bControl2 = {0, 0};
- //variables needed to calculate bezier control points
- auto ax = 0.0f, ay = 0.0f, bx = 0.0f, by = 0.0f, q1 = 0.0f, q2 = 0.0f, k2 = 0.0f;
auto endAngle = startAngle + ((i != nCurves - 1) ? M_PI_HALF : fract);
+ Point end = {radius * cos(endAngle), radius * sin(endAngle)};
- //get bezier start and end point
- start.x = radius * cos(startAngle);
- start.y = radius * sin(startAngle);
- end.x = radius * cos(endAngle);
- end.y = radius * sin(endAngle);
+ //variables needed to calculate bezier control points
//get bezier control points using article:
//(http://itc.ktu.lt/index.php/ITC/article/view/11812/6479)
- ax = start.x;
- ay = start.y;
- bx = end.x;
- by = end.y;
-
- q1 = ax * ax + ay * ay;
- q2 = ax * bx + ay * by + q1;
-
- k2 = static_cast<float> (4.0/3.0) * ((sqrt(2 * q1 * q2) - q2) / (ax * by - ay * bx));
-
- bControl1.x = ax - k2 * ay;
- bControl1.y = ay + k2 * ax;
- bControl2.x = bx + k2 * by;
- bControl2.y = by - k2 * bx;
-
- //move points to proper arc center
- start.x += center.x;
- start.y += center.y;
- end.x += center.x;
- end.y += center.y;
- bControl1.x += center.x;
- bControl1.y += center.y;
- bControl2.x += center.x;
- bControl2.y += center.y;
-
- impl->path->moveTo(start.x, start.y);
- impl->path->cubicTo(bControl1.x, bControl1.y, bControl2.x, bControl2.y, end.x, end.y);
+ auto ax = start.x;
+ auto ay = start.y;
+ auto bx = end.x;
+ auto by = end.y;
+ auto q1 = ax * ax + ay * ay;
+ auto q2 = ax * bx + ay * by + q1;
+ auto k2 = static_cast<float> (4.0/3.0) * ((sqrt(2 * q1 * q2) - q2) / (ax * by - ay * bx));
+
+ start = end; //Next start point is the current end point
+
+ end.x += cx;
+ end.y += cy;
+
+ Point ctrl1 = {ax - k2 * ay + cx, ay + k2 * ax + cy};
+ Point ctrl2 = {bx + k2 * by + cx, by - k2 * bx + cy};
+
+ impl->path->cubicTo(ctrl1.x, ctrl1.y, ctrl2.x, ctrl2.y, end.x, end.y);
startAngle = endAngle;
}
+ if (pie) {
+ impl->path->moveTo(cx, cy);
+ impl->path->close();
+ }
+
IMPL->flag |= RenderUpdateFlag::Path;
+
return Result::Success;
}
{
if (!canvas) return;
- //draw reference rectangles
+ //Arc Line
+ auto shape1 = tvg::Shape::gen();
+ shape1->appendArc(150, 150, 100, 10, 270, false);
+ shape1->stroke(255, 255, 255, 255);
+ shape1->stroke(2);
+ if (canvas->push(move(shape1)) != tvg::Result::Success) return;
+
auto shape2 = tvg::Shape::gen();
- shape2->appendRect(0, 0, 200, 200, 0, 0);
- shape2->stroke(255, 0, 0, 255);
+ shape2->appendArc(500, 150, 125, 0, 300, true);
+ shape2->stroke(255, 255, 255, 255);
shape2->stroke(2);
+ if (canvas->push(move(shape2)) != tvg::Result::Success) return;
+ //Pie Fill
auto shape3 = tvg::Shape::gen();
- shape3->moveTo(0, 100);
- shape3->lineTo(200, 100);
- shape3->stroke(255, 0, 0, 255);
- shape3->stroke(2);
+ shape3->appendArc(150, 500, 100, 0, 75, true);
+ shape3->fill(255, 255, 255, 255);
+ if (canvas->push(move(shape3)) != tvg::Result::Success) return;
auto shape4 = tvg::Shape::gen();
- shape4->moveTo(100, 0);
- shape4->lineTo(100, 200);
- shape4->stroke(255, 0, 0, 255);
- shape4->stroke(2);
-
- //test arc
- auto shape1 = tvg::Shape::gen();
- shape1->appendArc(0, 0, 200, 200, 10, 270);
- shape1->stroke(255, 255, 255, 255);
- shape1->stroke(3);
-
- //Appends Paths
- if (canvas->push(move(shape2)) != tvg::Result::Success) return;
- if (canvas->push(move(shape3)) != tvg::Result::Success) return;
+ shape4->appendArc(500, 500, 150, 0, 215, true);
+ shape4->fill(255, 255, 255, 255);
if (canvas->push(move(shape4)) != tvg::Result::Success) return;
- if (canvas->push(move(shape1)) != tvg::Result::Success) return;
}
/************************************************************************/