DenysMedvid/pdf2htmlEX
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first implementation of linear gradient

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This commit is contained in:
Lu Wang 2012-10-03 02:52:45 +08:00
parent 2041c2d146
commit 2755cf6567
1 changed files with 19 additions and 8 deletions
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27
src/HTMLRenderer/draw.cc
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@ -92,16 +92,21 @@ static void get_shading_bbox(GfxState * state, GfxShading * shading,
}
}
static double get_degree(double dx, double dy)
/*
* Note that the coordinate system in HTML and PDF are different
* In HTML:
* UP = 0
* RIGHT = PI / 2
* DOWN = PI
* LEFT = - PI / 2
*/
static double get_angle(double dx, double dy)
{
static const double PI = acos(-1.0);
double r = hypot(dx, dy);
double ang = acos(dx / r);
if(!_is_positive(dy))
ang = 2 * PI - ang;
return ang * 180.0 / PI;
return ang;
}
class LinearGradient
@ -118,6 +123,7 @@ public:
}
// TODO, add alpha
class ColorStop
{
public:
@ -126,7 +132,7 @@ public:
};
vector<ColorStop> stops;
double degree;
double angle;
};
LinearGradient::LinearGradient (GfxAxialShading * shading,
@ -136,7 +142,7 @@ LinearGradient::LinearGradient (GfxAxialShading * shading,
double t0x, t0y, t1x, t1y;
shading->getCoords(&t0x, &t0y, &t1x, &t1y);
degree = get_degree(t1x - t0x, t1y - t0y);
angle = get_angle(t1x - t0x, t1y - t0y);
// get the range of t in the box
// from GfxState.cc in poppler
@ -188,7 +194,12 @@ LinearGradient::LinearGradient (GfxAxialShading * shading,
void LinearGradient::dumpto (ostream & out)
{
out << "background-color:red;";
out << "background-image:-moz-linear-gradient(" << _round(angle) << "rad";
for(auto iter = stops.begin(); iter != stops.end(); ++iter)
{
out << "," << (iter->rgb) << " " << _round((iter->pos) * 100) << "%";
}
out << ");";
}
GBool HTMLRenderer::axialShadedFill(GfxState *state, GfxAxialShading *shading, double tMin, double tMax)