Do some inline distance indicators

2 files changed, 106 insertions, 103 deletions

diff --git a/src/main.c b/src/main.c
index 8579ddf..0798c94 100644
--- a/src/main.c
+++ b/src/main.c
@@ -50,19 +50,8 @@ void plot_point(struct point p) {
 	printf("<circle cx=\"%f\" cy=\"%f\" r=\".4\" fill=\"black\" />\n", p.pos[0], -p.pos[1]);
 }
 
-void plot_line_style(struct line l, enum LineStyle style) {
-	char *style_str;
-	switch(style) {
-		case LSTYLE_NORMAL:
-			style_str = "stroke=\"black\" stroke-width=\"0.2\"";
-			break;
-		case LSTYLE_CONSTRUCTION:
-			style_str = "stroke=\"blue\" stroke-width=\"0.1\" stroke-dasharray=\"0.7,0.2\" stroke-opacity=\"0.3\"";
-			break;
-		case LSTYLE_INDICATOR:
-			abort();
-			break;
-	}
+void plot_line(struct line l) {
+	char *style_str = "stroke=\"black\" stroke-width=\"0.2\"";
 	if(fabs(l.norm[0]) < fabs(l.norm[1])) {
 		double minx = -50;
 		double maxx =  50;
@@ -79,23 +68,16 @@ void plot_line_style(struct line l, enum LineStyle style) {
 		printf("<line %s x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" />\n", style_str, minx, -miny, maxx, -maxy);
 	}
 
-	if(style == LSTYLE_NORMAL) {
-		double d0 = glm_vec2_norm2(l.norm);
+	double d0 = glm_vec2_norm2(l.norm);
 
-		vec2 p0 = {0, 0};
-		glm_vec2_mulsubs(l.norm, l.C, p0);
-		glm_vec2_divs(p0, d0, p0);
+	vec2 p0 = {0, 0};
+	glm_vec2_mulsubs(l.norm, l.C, p0);
+	glm_vec2_divs(p0, d0, p0);
 
-		vec2 p1;
-		glm_vec2_add(p0, l.norm, p1);
-		// printf("%f %f\n", l.norm[0], l.norm[1]);
+	vec2 p1;
+	glm_vec2_add(p0, l.norm, p1);
 
-		printf("<line x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" stroke=\"black\" stroke-width=\".2\" />\n", p0[0], -p0[1], p1[0], -p1[1]);
-	}
-}
-
-void plot_line(struct line l) {
-	plot_line_style(l, LSTYLE_NORMAL);
+	printf("<line x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" stroke=\"black\" stroke-width=\".2\" />\n", p0[0], -p0[1], p1[0], -p1[1]);
 }
 
 void plot_circle(struct circle c) {
@@ -198,10 +180,9 @@ struct mid init_mid() {
 }
 
 int main(int argc, char *argv[]) {
-	struct constraints constraints = {0};
-	struct topology topo = {0};
+	struct constraints constraints = {};
+	struct topology topo = {};
 
-	// Figure 4
 	struct component components[] = {
 		{.type = COM_POINT},
 		{.type = COM_POINT},
@@ -339,7 +320,6 @@ int main(int argc, char *argv[]) {
 
 	struct drawing drawing = {};
 	solve_constraints(&constraints, &drawing);
-	// line.start.e = components[5].e;
 
 	double *params = malloc(sizeof(double) * (constraints.length));
 	for(size_t i = 0; i < constraints.length; i++) {
@@ -365,53 +345,19 @@ int main(int argc, char *argv[]) {
 
 	execute_drawing(&drawing, params);
 
-	printf("<svg version=\"1.1\" viewBox=\"-50 -50 100 100\" width=\"1200\" height=\"1200\" xmlns=\"http://www.w3.org/2000/svg\">\n");
+	begin_drawing();
+	// for(struct command *current = drawing.root; current != NULL && current != drawing.error; current = current->next) {
+	// 	if(current->hidden) continue;
+	// 	plot_generic(current->result);
+	// }
 
-	// Axis lines
-	printf("<line x1=\"-1000\" y1=\"0\" x2=\"1000\" y2=\"0\" stroke=\"black\" stroke-width=\"0.1\" stroke-opacity=\"0.4\" />\n");
-	printf("<line y1=\"-1000\" x1=\"0\" y2=\"1000\" x2=\"0\" stroke=\"black\" stroke-width=\"0.1\" stroke-opacity=\"0.4\" />\n");
+	// if(drawing.error != NULL) {
+	// 	plot_generic(*drawing.error->arg1);
+	// 	plot_generic(*drawing.error->arg2);
+	// 	fprintf(stderr, "Solver error detected. Drawing will be incomplete\n");
+	// }
 
-	for(struct command *current = drawing.root; current != NULL && current != drawing.error; current = current->next) {
-		if(current->hidden) continue;
-		plot_generic(current->result);
-	}
-
-	if(drawing.error != NULL) {
-		plot_generic(*drawing.error->arg1);
-		plot_generic(*drawing.error->arg2);
-		fprintf(stderr, "Solver error detected. Drawing will be incomplete\n");
-	}
-
-	struct component *head = NULL;
-	for(size_t i = 0; i < topo.length; i++) {
-		struct topology_elem *cur = &topo.elements[i];
-		switch(cur->cmd.op) {
-			case TOPO_MOVETO:
-				cur++;
-				if(cur->arg.c->e != NULL) head = cur->arg.c;
-				break;
-			case TOPO_LINETO:
-				cur++;
-				if(cur->arg.c->e != NULL) {
-					plot_line_between(head->e->point, cur->arg.c->e->point);
-					head = cur->arg.c;
-				}
-				break;
-			case TOPO_ARCTO:
-				cur++;
-				if(cur->arg.c->e != NULL && (cur+1)->arg.c->e != NULL) {
-					plot_arc_between(cur->arg.c->e->point, (cur+1)->arg.c->e->point, head->e->point);
-					head = (cur+1)->arg.c;
-				}
-				break;
-			case TOPO_END:
-				abort();
-		}
-	}
-
-	// printf("%f %f %f\n", components[3].e->line.norm[0], components[3].e->line.norm[1], components[3].e->line.C);
-	
+	draw_topology(&topo);
 	draw_constraints(&constraints);
-
-	printf("</svg>\n");
+	end_drawing();
 }
diff --git a/src/svg.c b/src/svg.c
index e84f17a..20a8262 100644
--- a/src/svg.c
+++ b/src/svg.c
@@ -14,9 +14,12 @@ void plot_line_between_style(struct point p1, struct point p2, enum LineStyle st
 		case LSTYLE_INDICATOR:
 			style_str = "stroke=\"blue\" stroke-width=\"0.1\" stroke-opacity=\"0.3\"";
 			break;
+		case LSTYLE_INDICATOR_INLINE:
+			style_str = "stroke=\"blue\" stroke-width=\"0.1\" stroke-opacity=\"0.3\" marker-start=\"url(#triangle)\" marker-end=\"url(#triangle)\"";
+			break;
 	}
 
-	printf("<line %s x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" />\n", style_str, p1.pos[0], -p1.pos[1], p2.pos[0], -p2.pos[1]);
+        printf("<line %s x1=\"%f\" y1=\"%f\" x2=\"%f\" y2=\"%f\" />\n", style_str, p1.pos[0], -p1.pos[1], p2.pos[0], -p2.pos[1]);
 }
 
 void plot_line_between(struct point p1, struct point p2) {
@@ -32,6 +35,7 @@ void plot_arc_between_style(struct point c, struct point p1, struct point p2, en
 		case LSTYLE_CONSTRUCTION:
 			abort();
 			break;
+		case LSTYLE_INDICATOR_INLINE:
 		case LSTYLE_INDICATOR:
 			style_str = "stroke=\"blue\" stroke-width=\"0.1\" stroke-opacity=\"0.3\"";
 			break;
@@ -103,9 +107,6 @@ void plot_angle(struct line l1, struct line l2, double theta, struct point *inte
 	char buf[512];
 	snprintf(buf, sizeof(buf), "%.1f°", theta);
 	plot_text(label_point, angle - M_PI/2, buf);
-
-	// plot_line_style(l1, LSTYLE_CONSTRUCTION);
-	// plot_line_style(l2, LSTYLE_CONSTRUCTION);
 }
 
 double project_point_to_line_distance(struct point p, struct line l) {
@@ -138,7 +139,7 @@ void extend_line_to(struct component* c, struct point *p) {
 	}
 }
 
-static void plot_distance_indicator(struct point p1, struct point p2, double distance) {
+static void plot_distance_indicator(struct point p1, struct point p2, double distance, bool offset) {
 	vec2 dir;
 	glm_vec2_sub(p2.pos, p1.pos, dir);
 	glm_vec2_normalize(dir);
@@ -147,27 +148,34 @@ static void plot_distance_indicator(struct point p1, struct point p2, double dis
 	struct point start;
 	struct point end;
 	{
-		glm_vec2_add(p1.pos, norm, start.pos);
-		glm_vec2_add(p2.pos, norm, end.pos);
-		plot_line_between_style(start, end, LSTYLE_INDICATOR);
+		if(offset) {
+			glm_vec2_add(p1.pos, norm, start.pos);
+			glm_vec2_add(p2.pos, norm, end.pos);
+		} else {
+			glm_vec2_copy(p1.pos, start.pos);
+			glm_vec2_copy(p2.pos, end.pos);
+		}
+		plot_line_between_style(start, end, offset ? LSTYLE_INDICATOR : LSTYLE_INDICATOR_INLINE);
 	}
 
-	// The little wings to highlight the ends
-	vec2 tip = {.3, .3};
-	glm_vec2_mul(norm, tip, tip);
-	{
-		struct point p1;
-		struct point p2;
-		glm_vec2_add(start.pos, tip, p1.pos);
-		glm_vec2_sub(start.pos, tip, p2.pos);
-		plot_line_between_style(p1, p2, LSTYLE_INDICATOR);
-	}
-	{
-		struct point p1;
-		struct point p2;
-		glm_vec2_add(end.pos, tip, p1.pos);
-		glm_vec2_sub(end.pos, tip, p2.pos);
-		plot_line_between_style(p1, p2, LSTYLE_INDICATOR);
+	if(offset) {
+		// The little wings to highlight the ends
+		vec2 tip = {.3, .3};
+		glm_vec2_mul(norm, tip, tip);
+		{
+			struct point p1;
+			struct point p2;
+			glm_vec2_add(start.pos, tip, p1.pos);
+			glm_vec2_sub(start.pos, tip, p2.pos);
+			plot_line_between_style(p1, p2, LSTYLE_INDICATOR);
+		}
+		{
+			struct point p1;
+			struct point p2;
+			glm_vec2_add(end.pos, tip, p1.pos);
+			glm_vec2_sub(end.pos, tip, p2.pos);
+			plot_line_between_style(p1, p2, LSTYLE_INDICATOR);
+		}
 	}
 
 	// The text
@@ -219,7 +227,10 @@ void draw_constraints(struct constraints *constraints) {
 				assert(constraint->c2->type == COM_POINT);
 				if(constraint->v == 0.0) continue;
 
-				plot_distance_indicator(constraint->c1->e->point, constraint->c2->e->point, constraint->v);
+				// @COMPL: It would be nice to combine the indicator and
+				// construction line if there's no topology line there
+				plot_line_between_style(constraint->c1->e->point, constraint->c2->e->point, LSTYLE_CONSTRUCTION);
+				plot_distance_indicator(constraint->c1->e->point, constraint->c2->e->point, constraint->v, true);
 			} break;
 			case CT_LINE_LINE_ANGLE: {
 				assert(constraint->c1->type == COM_LINE);
@@ -265,7 +276,10 @@ void draw_constraints(struct constraints *constraints) {
 					struct point closest;
 					line_distance_to_point(line->e->line, dist, &closest);
 
-					plot_distance_indicator(point->e->point, closest, constraint->v);
+					// @COMPL: It would be nice to combine the indicator and
+					// construction line if there's no topology line there
+					// plot_line_between_style(closest, point->e->point, LSTYLE_CONSTRUCTION);
+					plot_distance_indicator(point->e->point, closest, constraint->v, false);
 				}
 
 				extend_line_to(line, &point->e->point);
@@ -309,4 +323,47 @@ void draw_constraints(struct constraints *constraints) {
 }
 
 void draw_topology(struct topology *topo) {
+	struct component *head = NULL;
+	for(size_t i = 0; i < topo->length; i++) {
+		struct topology_elem *cur = &topo->elements[i];
+		switch(cur->cmd.op) {
+			case TOPO_MOVETO:
+				cur++;
+				if(cur->arg.c->e != NULL) head = cur->arg.c;
+				break;
+			case TOPO_LINETO:
+				cur++;
+				if(cur->arg.c->e != NULL) {
+					plot_line_between(head->e->point, cur->arg.c->e->point);
+					head = cur->arg.c;
+				}
+				break;
+			case TOPO_ARCTO:
+				cur++;
+				if(cur->arg.c->e != NULL && (cur+1)->arg.c->e != NULL) {
+					plot_arc_between(cur->arg.c->e->point, (cur+1)->arg.c->e->point, head->e->point);
+					head = (cur+1)->arg.c;
+				}
+				break;
+			case TOPO_END:
+				abort();
+		}
+	}
+}
+
+void begin_drawing() {
+	printf("<svg version=\"1.1\" viewBox=\"-50 -50 100 100\" width=\"1200\" height=\"1200\" xmlns=\"http://www.w3.org/2000/svg\">\n");
+	printf("<defs>\n");
+    printf("\t<marker id=\"triangle\" viewBox=\"0 0 10 10\" refX=\"10\" refY=\"5\" markerUnits=\"strokeWidth\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto-start-reverse\">\n");
+    printf("\t\t<path d=\"M 0 0 L 10 5 L 0 10 z\" fill=\"blue\" opacity=\"0.3\" />\n");
+    printf("\t</marker>\n");
+	printf("</defs>\n");
+
+	// Axis lines
+	printf("<line x1=\"-1000\" y1=\"0\" x2=\"1000\" y2=\"0\" stroke=\"black\" stroke-width=\"0.1\" stroke-opacity=\"0.4\" />\n");
+	printf("<line y1=\"-1000\" x1=\"0\" y2=\"1000\" x2=\"0\" stroke=\"black\" stroke-width=\"0.1\" stroke-opacity=\"0.4\" />\n");
+}
+
+void end_drawing() {
+	printf("</svg>\n");
 }