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small improvement on code for lazy updates, fixed dissappearing label bug

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This commit is contained in:
Sander Hautvast 2021-03-04 21:22:59 +01:00
parent b36b909073
commit 4929d12d33
2 changed files with 58 additions and 27 deletions
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79
src/js/index.js
View file

@ -36,23 +36,50 @@ const show = function (vector) {
return {description: `vector@${vector.id} is visible`};
}
export const update_lazy_objects = function () {
let b = Object.values(bindings); // a lazy expression must be bound
for (let i = 0; i < b.length; i++) { // unbound ones can exist, but are meaningless, because you cannot refer to them
let binding = b[i];
if (state[binding.name].lazy_expression) { // if lazy,
let value = visit(state[binding.name].lazy_expression); // reevaluate,
let existing_value = bindings[binding.name].evaluated; // update view
if (existing_value && existing_value.id) {
// update view after reevaluation of lazy vectors
update_vector_arrow(existing_value.id, value);
bindings[binding.name].evaluated = value;
} else if (value.is_new && value.is_vector){
// hidden lazy vector reappears
value.label_text=binding.name;
add_vector_arrow_to_svg(value);
export const update_visible_objects = function () {
Object.entries(bindings).forEach(entry => { // a lazy expression must be bound
const [name, binding] = entry;
let value = state[binding.name];
if (value.lazy_expression) {
let new_value = visit(value.lazy_expression); // reevaluate,
let existing_value = binding.evaluated; // update view
if (new_value.is_vector || existing_value.is_vector) {
bindings[name].evaluated = new_value;
new_value.label_text = existing_value.label_text; // SAD
update_vector(existing_value, new_value, name);
}
}
});
Object.entries(references).forEach(entry => {
const [id, value] = entry;
if (value.lazy_expression) {
let new_value = visit(value.lazy_expression);
let existing_value = value;
if (new_value.is_vector || existing_value.is_vector) {
new_value.lazy_expression = value.lazy_expression;
references[id] = new_value;
if (existing_value && existing_value.id) {
// update view after reevaluation of lazy vectors
update_vector_arrow(existing_value.id, new_value);
} else if (new_value.is_new && new_value.is_vector) {
// hidden lazy vector reappears
add_vector_arrow_to_svg(new_value);
}
}
}
});
}
function update_vector(existing_value, new_value, binding_name) {
if (existing_value && existing_value.id) {
// update view after reevaluation of lazy vectors
update_vector_arrow(existing_value.id, new_value);
} else if (new_value.is_new && new_value.is_vector) {
// hidden lazy vector reappears
new_value.label_text = binding_name;
add_vector_arrow_to_svg(new_value);
}
}
@ -113,9 +140,11 @@ const handle_enter = function () {
let statement = parse(tokens);
value = visit(statement);
let binding;
if (value.is_binding) { // if it's declaration work with the initializer
binding = value.name; // but we also need the name of the bound variable
value = state[binding];
if (value.is_binding) { // if it's declaration work with the initializer
binding = value.name; // but we also need the name of the bound variable
value = state[binding]; // lookup the value for the binding
} else if (value.id) {
references['@' + value.id] = value;
}
while (value.lazy_expression) {
value = value.get();
@ -139,7 +168,7 @@ const handle_enter = function () {
label(bindings[binding].previous, '@' + bindings[binding].previous.id);
}
}
update_lazy_objects();
update_visible_objects();
if (value.description) {
value = value.description;
}
@ -170,8 +199,9 @@ const visit = function (expr) {
}
state[binding_name] = value; // assign new value to binding
return bindings[binding_name];
}
return bindings[binding_name]; // don't return the value itself, but the binding_object
} // with which you can lookup the value
case 'group': // expression within parentheses
return visit(expr.expression);
case 'unary': {
@ -376,7 +406,6 @@ export const create_vector = function (vector) { //rename to create_vector
vector.toString = function () {
return `vector@${this.id}{x0:${vector.x0},y0:${vector.y0} x:${vector.x},y:${vector.y}}`;
};
references["@" + vector.id] = vector;
vector.hide = function () {
return hide(this);
};
@ -392,7 +421,11 @@ export const create_vector = function (vector) { //rename to create_vector
const resolve_arguments = function (argument_exprs) {
let arguments_list = [];
for (let i = 0; i < argument_exprs.length; i++) {
arguments_list.push(visit(argument_exprs[i]));
let value = visit(argument_exprs[i]);
if (value.lazy_expression) {
value = value.get(); // not convinced this must be here, but where else?
}
arguments_list.push(value);
}
return arguments_list;
}

6
src/js/svg_functions.js
View file

@ -1,4 +1,4 @@
import {update_lazy_objects} from "./index";
import {update_visible_objects} from "./index";
let vectors_by_id = {};
const SVG_NS = 'http://www.w3.org/2000/svg'; // program needs these to create svg elements
@ -170,11 +170,9 @@ export const add_vector_arrow_to_svg = function (vector) {
vector_arrow.onmousedown = function start_moving_vector(event) {
moving_vector = event.target;
};
vector_group.appendChild(vector_arrow);
let label = create_label(vector);
vector_group.appendChild(label);
}
@ -297,7 +295,7 @@ const move_vector = function (event) {
vector.y = (origin_y - current_y) / grid_size;
moving_vector.setAttribute('d', create_d(origin_x, origin_y, current_x, current_y));
update_label(moving_vector.id, moving_vector.id, current_x + 5, current_y + 5);
update_lazy_objects();
update_visible_objects();
}
}
}