#include "InsetMathRoot.h"
-#include "MathData.h"
#include "MathStream.h"
#include "MathSupport.h"
namespace lyx {
+using namespace frontend;
InsetMathRoot::InsetMathRoot(Buffer * buf)
: InsetMathNest(buf, 2)
}
-void InsetMathRoot::metrics(MetricsInfo & mi, Dimension & dim) const
+void mathed_root_metrics(MetricsInfo & mi, MathData const & nucleus,
+ MathData const * root, Dimension & dim)
{
Changer dummy = mi.base.changeEnsureMath();
- Dimension dim0;
- {
+ Dimension dimr;
+ if (root) {
Changer script = mi.base.font.changeStyle(LM_ST_SCRIPTSCRIPT);
- cell(0).metrics(mi, dim0);
+ root->metrics(mi, dimr);
// make sure that the dim is high enough for any character
Dimension fontDim;
math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
- dim0 += fontDim;
+ dimr += fontDim;
}
- Dimension dim1;
- cell(1).metrics(mi, dim1);
+ Dimension dimn;
+ nucleus.metrics(mi, dimn);
// make sure that the dim is high enough for any character
- Dimension fontDim;
- math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
- dim1 += fontDim;
+ // Dimension fontDim;
+ // math_font_max_dim(mi.base.font, fontDim.asc, fontDim.des);
+ // dimn += fontDim;
+
+ // Some room for the decoration
+ // The width of left decoration was 9 pixels with a 10em font
+ int const w = 9 * mathed_font_em(mi.base.font) / 10;
+ /* See rule 11 in Appendix G of Rhe TeXbook for the computation of the spacing
+ * above nucleus.
+ * FIXME more work is needed to implement properly rule 11.
+ * * Ideally, we should use sqrt glyphs from the math fonts. Note
+ that then we would get rule thickness from there.
+ * * The positioning of the root MathData is arbitrary. It should
+ * follow the definition of \root...\of... in The Texbook in
+ * Apprendix B page 360.
+ *
+ */
+ int const t = mi.base.solidLineThickness();
+ int const x_height = mathed_font_x_height(mi.base.font);
+ int const phi = (mi.base.font.style() == LM_ST_DISPLAY) ? x_height : t;
+ // first part is the spacing, second part is the line width
+ // itself, and last one is the spacing above.
+ int const space_above = (t + phi / 4) + t + t;
+ int const a = dimn.ascent();
+ int const d = dimn.descent();
+ // Not sure what the 1 stands for, it is needed to have some spacing at small sizes.
+ dim.asc = max(dimr.ascent() + (d - a) / 2, a + space_above) + 1;
+ dim.des = max(dimr.descent() - (d - a) / 2, d);
+ dim.wid = max(dimr.width() + 3 * w / 8, w) + dimn.width();
+}
+
- dim.asc = max(dim0.ascent() + 5, dim1.ascent()) + 1;
- dim.des = max(dim0.descent() - 5, dim1.descent());
- dim.wid = dim0.width() + dim1.width() + 4;
+void InsetMathRoot::metrics(MetricsInfo & mi, Dimension & dim) const
+{
+ mathed_root_metrics(mi, cell(1), &cell(0), dim);
}
-void InsetMathRoot::draw(PainterInfo & pi, int x, int y) const
+void mathed_draw_root(PainterInfo & pi, int x, int y, MathData const & nucleus,
+ MathData const * root, Dimension const & dim)
{
Changer dummy = pi.base.changeEnsureMath();
- Dimension const dim = dimension(*pi.base.bv);
+ // The width of left decoration was 9 pixels with a 10em font
+ int const w = 9 * mathed_font_em(pi.base.font) / 10;
+ // the height of the hook was 5 with a 10em font
+ int const h = 5 * mathed_font_em(pi.base.font) / 10;
int const a = dim.ascent();
int const d = dim.descent();
- Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
- int const w = dim0.width();
+ int const t = pi.base.solidLineThickness();
+ Dimension const dimn = nucleus.dimension(*pi.base.bv);
+ // the width of the left part of the root
+ int const wl = dim.width() - dimn.width();
// the "exponent"
- {
+ if (root) {
Changer script = pi.base.font.changeStyle(LM_ST_SCRIPTSCRIPT);
- cell(0).draw(pi, x, y + (d - a)/2 - dim0.descent());
+ Dimension const dimr = root->dimension(*pi.base.bv);
+ int const root_offset = wl - 3 * w / 8 - dimr.width();
+ root->draw(pi, x + root_offset, y + (d - a)/2);
}
// the "base"
- cell(1).draw(pi, x + w + 4, y);
+ nucleus.draw(pi, x + wl, y);
int xp[4];
int yp[4];
- pi.pain.line(x + dim.width(), y - a + 1,
- x + w + 4, y - a + 1, pi.base.font.color());
- xp[0] = x + w + 4; yp[0] = y - a + 1;
- xp[1] = x + w; yp[1] = y + d;
- xp[2] = x + w - 2; yp[2] = y + (d - a)/2 + 2;
- xp[3] = x + w - 5; yp[3] = y + (d - a)/2 + 4;
- pi.pain.lines(xp, yp, 4, pi.base.font.color());
+ pi.pain.line(x + dim.width(), y - a + 2 * t,
+ x + wl, y - a + 2 * t, pi.base.font.color(),
+ Painter::line_solid, t);
+ xp[0] = x + wl; yp[0] = y - a + 2 * t + 1;
+ xp[1] = x + wl - w / 2; yp[1] = y + d;
+ xp[2] = x + wl - w + h / 4; yp[2] = y + d - h;
+ xp[3] = x + wl - w; yp[3] = y + d - h + h / 4;
+ pi.pain.lines(xp, yp, 4, pi.base.font.color(),
+ Painter::fill_none, Painter::line_solid, t);
+}
+
+
+void InsetMathRoot::draw(PainterInfo & pi, int x, int y) const
+{
+ mathed_draw_root(pi, x, y, cell(1), &cell(0), dimension(*pi.base.bv));
}
projects / lyx.git / blobdiff