[LyX/master] Fix arrows at ends of math decorations

Enrico Forestieri forenr at lyx.org
Sun Feb 14 00:36:55 UTC 2021


commit 11392b7b33d947e76e2c2d589c465ab008701b9d
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Sun Feb 14 01:25:07 2021 +0100

    Fix arrows at ends of math decorations
    
    For math decorations with arrows at both ends the code was simply
    stretching a prototype symbol, thus distorting the arrows.
    
    Another drawing mode is introduced allowing to draw an element by
    maintaining its aspect ratio also when it has to be drawn at the
    other end of a decoration. An element drawn using this mode is simply
    shifted to the other side by adding either the width or the height,
    and a finer adjustment can be obtained by specifying an additional
    horizontal or vertical shift.
---
 src/mathed/MathSupport.cpp |  148 ++++++++++++++++++++++++++------------------
 1 files changed, 87 insertions(+), 61 deletions(-)

diff --git a/src/mathed/MathSupport.cpp b/src/mathed/MathSupport.cpp
index a4b0693..39a58b2 100644
--- a/src/mathed/MathSupport.cpp
+++ b/src/mathed/MathSupport.cpp
@@ -84,7 +84,8 @@ namespace {
 /*
  * Internal struct of a drawing: code n x1 y1 ... xn yn, where code is:
  * 0 = end, 1 = line, 2 = polyline, 3 = square line, 4 = square polyline
- * 5 = rounded thick line (i.e. dot for short line)
+ * 5 = rounded thick line (i.e. dot for short line),
+ * 6 = shifted square polyline drawn at the other end
  */
 
 
@@ -141,81 +142,90 @@ double const mapsto[] = {
 
 
 double const lhook[] = {
-	2, 3,
-	0.25, 0.015, 0.05, 0.5, 0.25, 0.985,
-	1, 0.015, 0.475, 0.7, 0.475,
-	2, 5,
-	0.7, 0.015, 0.825, 0.15, 0.985, 0.25,
-	0.825, 0.35, 0.7, 0.475,
+	4, 7,
+	1.40, -0.30, 1.10, 0.00, 0.60, 0.35,
+	0.00,  0.60, 0.60, 0.85, 1.10, 1.20,
+	1.40,  1.50,
+	3, 0.05, 0.6, 1.0, 0.6,
+	6, -0.5, 0.0, 6,
+	0.65, -0.40, 0.95, -0.35, 1.15, -0.10,
+	1.15,  0.25, 0.95,  0.50, 0.65,  0.60,
 	0
 };
 
 
 double const rhook[] = {
-	2, 3,
-	0.75, 0.015, 0.95, 0.5, 0.75, 0.985,
-	1, 0.3, 0.475, 0.985, 0.475,
-	2, 5,
-	0.3, 0.015, 0.175, 0.15, 0.05, 0.25,
-	0.175, 0.35, 0.3, 0.475,
+	4, 6,
+	0.50, -0.40, 0.20, -0.35, 0.00, -0.10,
+	0.00,  0.25, 0.20,  0.50, 0.50, 0.60,
+	3, 0.55, 0.60, 1.00, 0.60,
+	6, -0.8, 0.0, 7,
+	0.00, -0.30, 0.30, 0.00, 0.80, 0.35, 1.40, 0.60,
+	0.80,  0.85, 0.30, 1.20, 0.00, 1.50,
 	0
 };
 
 
 double const LRArrow[] = {
-	2, 3,
-	0.25, 0.015, 0.05, 0.5, 0.25, 0.985,
-	2, 3,
-	0.75, 0.015, 0.95, 0.5, 0.75, 0.985,
-	1, 0.2, 0.8, 0.8, 0.8,
-	1, 0.2, 0.2, 0.8, 0.2,
+	4, 7,
+	1.300, -0.300, 1.100, 0.000, 0.600, 0.350,
+	0.000,  0.600, 0.600, 0.850, 1.100, 1.200,
+	1.300,  1.500,
+	6, -0.1, 0.0, 7,
+	-0.300, -0.300, -0.100, 0.000,  0.400, 0.350,
+	 1.000,  0.600,  0.400, 0.850, -0.100, 1.200,
+	-0.300,  1.500,
+	3, 0.85, 1.0, 1.0, 1.0,
+	3, 0.85, 0.2, 1.0, 0.2,
 	0
 };
 
 
 double const LArrow[] = {
-	2, 3,
-	0.25, 0.015, 0.05, 0.5, 0.25, 0.985,
-	1, 0.2, 0.8, 0.985, 0.8,
-	1, 0.2, 0.2, 0.985, 0.2,
+	4, 7,
+	1.300, -0.300, 1.100, 0.000, 0.600, 0.350,
+	0.000,  0.600, 0.600, 0.850, 1.100, 1.200,
+	1.300,  1.500,
+	3, 0.85, 1.0, 1.0, 1.0,
+	3, 0.85, 0.2, 1.0, 0.2,
 	0
 };
 
 
 double const lharpoondown[] = {
-	2, 2,
-	0.015, 0.5, 0.25, 0.985,
-	1, 0.02, 0.475, 0.985, 0.475,
+	4, 4,
+	0.0, 0.6, 0.6, 0.85, 1.1, 1.2, 1.4, 1.5,
+	3, 0.05, 0.6, 1.0, 0.6,
 	0
 };
 
 
 double const lharpoonup[] = {
-	2, 2,
-	0.25, 0.015, 0.015, 0.5,
-	1, 0.02, 0.525, 0.985, 0.525,
+	4, 4,
+	0.0, 0.6, 0.6, 0.35, 1.1, 0.0, 1.4, -0.3,
+	3, 0.05, 0.6, 1.0, 0.6,
 	0
 };
 
 
 double const lrharpoons[] = {
-	2, 2,
-	0.25, 0.015, 0.015, 0.225,
-	1, 0.02, 0.23, 0.985, 0.23,
-	2, 2,
-	0.75, 0.985, 0.985, 0.775,
-	1, 0.02, 0.7, 0.980, 0.7,
+	4, 4,
+	0.0, 0.6, 0.6, 0.35, 1.1, 0.0, 1.4, -0.3,
+	3, 0.05, 0.6, 1.0, 0.6,
+	3, 0.05, 1.2, 1.0, 1.2,
+	6, -1.0, 0.0, 4,
+	1.1, 1.3, 0.4, 1.55, -0.1, 1.9, -0.4, 2.2,
 	0
 };
 
 
 double const rlharpoons[] = {
-	2, 2,
-	0.75, 0.015, 0.985, 0.225,
-	1, 0.02, 0.23, 0.985, 0.23,
-	2, 2,
-	0.25, 0.985, 0.015, 0.775,
-	1, 0.02, 0.7, 0.980, 0.7,
+	6, -1.0, 0.0, 4,
+	-0.4, -0.4, -0.1, -0.1, 0.4, 0.25, 1.0, 0.5,
+	3, 0.05, 0.6, 1.0, 0.6,
+	3, 0.05, 1.2, 1.0, 1.2,
+	4, 4,
+	0.0, 1.2, 0.6, 1.45, 1.1, 1.8, 1.4, 2.1,
 	0
 };
 
@@ -242,32 +252,40 @@ double const arrow[] = {
 
 double const Arrow[] = {
 	4, 7,
-	0.0150, 0.7500, 0.2000, 0.6000, 0.3500, 0.3500,
-	0.5000, 0.0500, 0.6500, 0.3500, 0.8000, 0.6000,
-	0.9500, 0.7500,
-	3, 0.3500, 0.5000, 0.3500, 0.9500,
-	3, 0.6500, 0.5000, 0.6500, 0.9500,
+	0.0000, 0.7500, 0.1500, 0.6000, 0.3500, 0.3500,
+	0.5000, 0.0500, 0.6500, 0.3500, 0.8500, 0.6000,
+	1.0000, 0.7500,
+	3, 0.3000, 0.4500, 0.3000, 1.0000,
+	3, 0.7000, 0.4500, 0.7000, 1.0000,
 	0
 };
 
 
 double const udarrow[] = {
-	2, 3,
-	0.015, 0.25,  0.5, 0.05, 0.95, 0.25,
-	2, 3,
-	0.015, 0.75,  0.5, 0.95, 0.95, 0.75,
-	1, 0.5, 0.1,  0.5, 0.9,
+	4, 7,
+	0.0500,  0.6500, 0.2000, 0.5000, 0.3500, 0.2500,
+	0.5000, -0.0500, 0.6500, 0.2500, 0.8000, 0.5000,
+	0.9500, 0.6500,
+	6, 0.0, -1.0, 7,
+	0.0500,  0.2500, 0.2000, 0.4000, 0.3500, 0.6500,
+	0.5000,  0.9500, 0.6500, 0.6500, 0.8000, 0.4000,
+	0.9500, 0.2500,
+	3, 0.5, 0.0,  0.5, 1.0,
 	0
 };
 
 
 double const Udarrow[] = {
-	2, 3,
-	0.015, 0.25,  0.5, 0.05, 0.95, 0.25,
-	2, 3,
-	0.015, 0.75,  0.5, 0.95, 0.95, 0.75,
-	1, 0.35, 0.2, 0.35, 0.8,
-	1, 0.65, 0.2, 0.65, 0.8,
+	4, 7,
+	0.0000, 0.7500, 0.1500, 0.6000, 0.3500, 0.3500,
+	0.5000, 0.0500, 0.6500, 0.3500, 0.8500, 0.6000,
+	1.0000, 0.7500,
+	6, 0.0, -1.0, 7,
+	0.0000, 0.2500, 0.1500, 0.4000, 0.3500, 0.6500,
+	0.5000, 0.9500, 0.6500, 0.6500, 0.8500, 0.4000,
+	1.0000, 0.2500,
+	3, 0.3000, 0.4500, 0.3000, 0.9500,
+	3, 0.7000, 0.4500, 0.7000, 0.9500,
 	0
 };
 
@@ -701,14 +719,22 @@ void mathed_draw_deco(PainterInfo & pi, int x, int y, int w, int h,
 		} else {
 			int xp[32];
 			int yp[32];
+			double xshift = (code == 6 ? d[i++] : 0.0);
+			double yshift = (code == 6 ? d[i++] : 0.0);
 			int const n2 = int(d[i++]);
 			for (int j = 0; j < n2; ++j) {
-				double xx = d[i++];
-				double yy = d[i++];
+				double xx = d[i++] + xshift;
+				double yy = d[i++] + yshift;
 //	     lyxerr << ' ' << xx << ' ' << yy << ' ';
-				if (code == 4)
+				if (code == 4 || code == 6) {
 					sqmt.transform(xx, yy);
-				else
+					if (code == 6) {
+						if (r == 0 && xshift == 0.0)
+							yy += h;
+						else
+							xx += w;
+					}
+				} else
 					mt.transform(xx, yy);
 				xp[j] = int(x + xx + 0.5);
 				yp[j] = int(y + yy + 0.5);


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