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Improve metrics of equations. More work remains to be done.

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Use proper value for above/below skip (12pt) instead of the hardcoded
12 pixels.

Add forgotten skip before display math preview.

Make "too small preview" size dpi-dependent.
Make gap in front of equation (what is it good for, BTW?) dpi-dependent.
This commit is contained in:
Jean-Marc Lasgouttes 2018-02-19 18:24:29 +01:00
parent 5b331b1466
commit 56e012be83
2 changed files with 29 additions and 23 deletions
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47
src/mathed/InsetMathHull.cpp
View File

@ -525,22 +525,37 @@ bool InsetMathHull::previewState(const BufferView *const bv) const
namespace {
static const int ERROR_FRAME_WIDTH = 2;
const int ERROR_FRAME_WIDTH = 2;
bool previewTooSmall(MetricsBase const & mb, Dimension const & dim)
{
// Value was hardcoded to 10 pixels
int const minval = mb.bv->zoomedPixels(10);
return dim.width() <= minval && dim.height() <= minval;
}
}
void InsetMathHull::metrics(MetricsInfo & mi, Dimension & dim) const
{
// true value in LaTeX is 12pt plus 3pt minus 9pt
// FIXME: even better would be to handle the short skip case.
int const display_margin = display() ? mi.base.inPixels(Length(12, Length::PT)) : 0;
if (previewState(mi.base.bv)) {
preview_->metrics(mi, dim);
if (previewTooSmall(dim)) {
if (previewTooSmall(mi.base, dim)) {
// preview image is too small
dim.wid += 2 * ERROR_FRAME_WIDTH;
dim.asc += 2 * ERROR_FRAME_WIDTH;
} else {
// insert a one pixel gap in front of the formula
dim.wid += 1;
if (display())
dim.des += displayMargin();
// insert a gap in front of the formula
// value was hardcoded to 1 pixel
dim.wid += mi.base.bv->zoomedPixels(1) ;
if (display()) {
dim.asc += display_margin;
dim.des += display_margin;
}
}
return;
}
@ -553,8 +568,8 @@ void InsetMathHull::metrics(MetricsInfo & mi, Dimension & dim) const
InsetMathGrid::metrics(mi, dim);
if (display()) {
dim.asc += displayMargin();
dim.des += displayMargin();
dim.asc += display_margin;
dim.des += display_margin;
}
if (numberedType()) {
@ -580,18 +595,12 @@ void InsetMathHull::metrics(MetricsInfo & mi, Dimension & dim) const
}
bool InsetMathHull::previewTooSmall(Dimension const & dim) const
{
return dim.width() <= 10 && dim.height() <= 10;
}
ColorCode InsetMathHull::backgroundColor(PainterInfo const & pi) const
{
BufferView const * const bv = pi.base.bv;
if (previewState(bv)) {
Dimension const dim = dimension(*pi.base.bv);
if (previewTooSmall(dim))
if (previewTooSmall(pi.base, dim))
return Color_error;
return graphics::PreviewLoader::backgroundColor();
}
@ -621,7 +630,7 @@ void InsetMathHull::drawMarkers(PainterInfo & pi, int x, int y) const
void InsetMathHull::drawBackground(PainterInfo & pi, int x, int y) const
{
Dimension const dim = dimension(*pi.base.bv);
if (previewTooSmall(dim)) {
if (previewTooSmall(pi.base, dim)) {
pi.pain.fillRectangle(x, y - 2 * ERROR_FRAME_WIDTH,
dim.wid, dim.asc + dim.des, backgroundColor(pi));
return;
@ -645,12 +654,14 @@ void InsetMathHull::draw(PainterInfo & pi, int x, int y) const
// already.
Changer dummy = !canPaintChange(*bv) ? make_change(pi.change_, Change())
: Changer();
if (previewTooSmall(dim)) {
if (previewTooSmall(pi.base, dim)) {
// we have an extra frame
preview_->draw(pi, x + ERROR_FRAME_WIDTH, y);
} else {
// one pixel gap in front
preview_->draw(pi, x + 1, y);
// value was hardcoded to 1 pixel
int const gap = pi.base.bv->zoomedPixels(1) ;
preview_->draw(pi, x + gap, y);
}
return;
}

5
src/mathed/InsetMathHull.h
View File

@ -175,9 +175,6 @@ public:
///
void initUnicodeMath() const;
///
static int displayMargin() { return 12; }
/// Force inset into LTR environment if surroundings are RTL
virtual bool forceLTR() const { return true; }
///
@ -305,8 +302,6 @@ protected:
void handleFont2(Cursor & cur, docstring const & arg);
///
bool previewState(BufferView const * const bv) const;
///
bool previewTooSmall(Dimension const & dim) const;
};