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https://github.com/ultimatepp/ultimatepp.git
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97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
#include "Painter.h"
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namespace Upp {
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struct PainterRadialSpan : SpanSource {
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LinearInterpolator interpolator;
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double cx, cy, r, fx, fy;
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int style;
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int alpha;
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const RGBA *gradient;
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double C;
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void Set(double _x, double _y, double _r, double _fx, double _fy)
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{
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cx = _x;
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cy = _y;
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r = _r;
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fx = _fx;
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fy = _fy;
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fx -= cx;
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fy -= cy;
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C = fx * fx + fy * fy - r * r;
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}
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void Get(RGBA *_span, int x, int y, unsigned len)
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{
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if(r <= 0)
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return;
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interpolator.Begin(x, y, len);
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RGBA *span = (RGBA *)_span;
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while(len--) {
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Point p = interpolator.Get();
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int h;
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const double q256 = 1 / 256.0;
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double dx = q256 * p.x - cx - fx;
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double dy = q256 * p.y - cy - fy;
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if(dx == 0 && dy == 0)
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h = 0;
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else {
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double A = dx * dx + dy * dy;
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double b = (fx * dx + fy * dy);
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double t = (sqrt(b * b - A * C) - b) / (A);
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h = t >= 0.001 ? int(2047 / t) : 2047;
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}
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if(style == GRADIENT_REPEAT)
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h = h & 2047;
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else
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if(style == GRADIENT_REFLECT)
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h = (h & 2048) ? (2047 - h & 2047) : (h & 2047);
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else
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h = minmax(h, 0, 2047);
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*span++ = gradient[h];
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}
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}
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};
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void BufferPainter::RenderRadial(double width, const Pointf& f, const RGBA& color1,
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const Pointf& c, double r, const RGBA& color2,
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const Xform2D& m, int style)
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{
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Image gradient = Gradient(color1, color2, 2048);
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RenderPath(width, [=](One<SpanSource>& ss) {
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PainterRadialSpan& sg = ss.Create<PainterRadialSpan>();
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sg.interpolator.Set(Inverse(m));
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sg.style = style;
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sg.Set(c.x, c.y, r, f.x, f.y);
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sg.gradient = gradient[0];
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}, RGBAZero());
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}
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void BufferPainter::FillOp(const Pointf& f, const RGBA& color1, const Pointf& c, double r, const RGBA& color2, int style)
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{
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RenderRadial(-1, f, color1, c, r, color2, pathattr.mtx, style);
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}
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void BufferPainter::StrokeOp(double width, const Pointf& f, const RGBA& color1, const Pointf& c, double r, const RGBA& color2, int style)
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{
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RenderRadial(width, f, color1, c, r, color2, pathattr.mtx, style);
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}
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void BufferPainter::RenderRadial(double width, const Pointf& f, const RGBA& color1,
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const RGBA& color2, const Xform2D& transsrc, int style)
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{
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RenderRadial(width, f, color1, Pointf(0, 0), 1, color2, transsrc * pathattr.mtx, style);
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}
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void BufferPainter::FillOp(const Pointf& f, const RGBA& color1, const RGBA& color2, const Xform2D& transsrc, int style)
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{
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RenderRadial(-1, f, color1, color2, transsrc, style);
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}
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void BufferPainter::StrokeOp(double width, const Pointf& f, const RGBA& color1, const RGBA& color2, const Xform2D& transsrc, int style)
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{
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RenderRadial(width, f, color1, color2, transsrc, style);
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}
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}
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