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index.html
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index.html
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<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Ohm</title>
<script src="https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js"></script>
<link href="https://fonts.googleapis.com/css?family=Varela+Round" rel="stylesheet" />
<style type="text/css">
* {
margin: 0;
padding: 0;
font-family: "Varela Round", Helvetica, Arial, Sans-Serif;
}
html {
display: flex;
}
body {
background-color: #f2f2f2;
display: flex;
min-height: 100vh;
}
h1 {
font-size: 1.5em;
}
/* Link inside h1 (ohm logo/title) */
h1 > a {
/* Make link have no special style, normal color and no underline: */
color: inherit;
text-decoration: none;
}
.sidebar {
height: 100vh;
min-height: 600px;
min-width: 90px;
background-color: #ececec;
color: #4a4a4a;
display: flex;
flex-direction: column;
position: fixed;
}
.sidebar_content {
height: 100%;
display: flex;
flex-direction: column;
}
.toolheader {
flex: 0 1 auto;
margin: auto;
margin-top: 1em;
}
.toolbox {
flex: 1 1 auto;
display: flex;
flex-direction: column;
margin: auto;
margin-top: 1em;
margin-bottom: 1em;
}
.tool {
flex: 1 1 auto;
min-width: 36;
height: 36;
display: flex;
justify-content: center;
align-items: center;
}
.tool > div {
padding: 1em;
}
.active_tool {
color: blue;
}
/* The tool svg icons, or text divs when offline: */
.tool_icon {
min-width: 28;
height: 28;
text-align: center;
transition: all 0.25s linear;
}
.tool_icon:hover {
cursor: pointer;
transform: scale(1.3);
}
/* SVG styling:
Should only be done in CSS for temporary styling while editing,
so, coloring red for delete and blue for temp is okay,
but setting stroke-width etc. should be done on the SVG nodes from
javascript, and not in CSS. This is to ensure that the SVG looks
identical once you hit save.
*/
.to_delete {
stroke: red;
}
circle.fill.to_delete {
fill: red;
}
.to_edit {
stroke: blue;
}
text.to_edit {
fill: blue;
}
circle.fill.to_edit {
fill: blue;
}
.to_place {
stroke: green;
}
circle.fill.to_place {
fill: green;
}
#drawing > text {
cursor: default;
}
#drawing {
background-color: #ffffff;
border: 2px;
border-color: #4a4a4a;
margin: 1em;
margin-left: calc(1em + 90px);
}
.grid_line.major {
stroke: rgb(200, 200, 200);
stroke-width: 0.4;
}
.grid_line.minor {
stroke: rgb(200, 200, 200);
stroke-width: 0.2;
}
</style>
<script>
// Global state:
let active_tool = "wire";
const GRID_SIZE = 60;
let grid_size = GRID_SIZE;
let translation = null;
let mouse = null;
function init_ohm() {
document.onkeydown = key_down;
const p = document.getElementById("drawing");
p.onmousedown = drawing_mouse_down;
p.onmouseup = drawing_mouse_up;
p.onmousemove = drawing_mouse_move;
refresh_grid_lines();
activate_tool(active_tool);
}
function activate_tool(new_state) {
remove_elements(".to_place");
unselect_elements();
active_tool = new_state;
const toolbox = document.getElementById("toolbox");
for (const tool of toolbox.children) {
if (tool.id === active_tool) {
tool.classList.add("active_tool");
} else {
tool.classList.remove("active_tool");
}
}
}
// Grid functions:
function round_to_grid(pos) {
return Math.round(pos / grid_size) * grid_size;
}
function get_grid_flavor(xy) {
if (Math.round(xy) % GRID_SIZE === 0) {
return "major";
}
return "minor";
}
function init_grid() {
const drawing = document.getElementById("drawing");
const svg_width = Number(drawing.getAttribute("width"));
const svg_height = Number(drawing.getAttribute("height"));
for (let x = grid_size; x < svg_width; x += grid_size) {
create_grid_line(x, 0, x, svg_height, get_grid_flavor(x));
}
for (let y = grid_size; y < svg_height; y += grid_size) {
create_grid_line(0, y, svg_width, y, get_grid_flavor(y));
}
}
function num_to_string(num) {
// Converts a number to string with max 2 decimal places
// Useful for having nice numbers in svg (file).
let str = num.toFixed(2);
while (str.endsWith("0")) {
str = str.slice(0, -1);
}
if (str.endsWith(".")) {
str = str.slice(0, -1);
}
return str;
}
function create_grid_line(x1, y1, x2, y2, flavor) {
const drawing = document.getElementById("drawing");
const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
line.setAttribute("x1", num_to_string(x1));
line.setAttribute("y1", num_to_string(y1));
line.setAttribute("x2", num_to_string(x2));
line.setAttribute("y2", num_to_string(y2));
line.classList.add("grid_line");
line.classList.add(flavor);
drawing.prepend(line);
}
function refresh_grid_lines() {
remove_elements(".grid_line");
init_grid();
}
function resize(key) {
const drawing = document.getElementById("drawing");
let svg_width = Number(drawing.getAttribute("width"));
let svg_height = Number(drawing.getAttribute("height"));
if (key === "+") {
svg_width += GRID_SIZE;
svg_height += GRID_SIZE;
} else if (key === "-") {
if (svg_width > GRID_SIZE) {
svg_width -= GRID_SIZE;
svg_height -= GRID_SIZE;
}
} else if (key === "ArrowUp") {
if (svg_height > GRID_SIZE) {
svg_height -= GRID_SIZE;
}
} else if (key === "ArrowDown") {
svg_height += GRID_SIZE;
} else if (key === "ArrowLeft") {
if (svg_width > GRID_SIZE) {
svg_width -= GRID_SIZE;
}
} else if (key === "ArrowRight") {
svg_width += GRID_SIZE;
} else {
alert("Error: bad resize - " + key);
}
drawing.setAttribute("width", "" + svg_width);
drawing.setAttribute("height", "" + svg_height);
refresh_grid_lines();
}
function subdivide_grid(subdivisions) {
const drawing = document.getElementById("drawing");
grid_size = GRID_SIZE / subdivisions;
refresh_grid_lines();
}
// General functions for manipulating the svg drawing:
// (Selecting, adding, removing)
function default_parent(parent = null) {
if (parent) return parent;
return document.getElementById("drawing");
}
function get_elements(query_selector, parent = null) {
parent = default_parent(parent);
return parent.querySelectorAll(query_selector);
}
function no_elements(query_selector, parent = null) {
return get_elements(query_selector, parent).length === 0;
}
function remove_elements(query_selector, parent = null) {
const elements = get_elements(query_selector, parent);
elements.forEach(e => {
e.remove();
});
}
function create_element(element) {
element.classList.add("to_place");
element.classList.remove("to_edit");
const drawing = document.getElementById("drawing");
if (element.tagName === "circle") {
// Circles and dots are appended at the end:
drawing.appendChild(element);
} else {
// Others are inserted before the circles / dots:
const firstCircle = drawing.getElementsByTagName("circle")[0];
drawing.insertBefore(element, firstCircle);
}
}
function remove_class(class_name, parent = null) {
const elements = get_elements("." + class_name, parent);
for (const element of elements) {
element.classList.remove(class_name);
}
}
function place_elements() {
remove_class("to_place");
}
// Copy and delete tools select elements inside svg using classes (coloring them)
// This function removes those classes, for example when switching tool
function unselect_elements() {
remove_class("to_edit");
remove_class("to_delete");
}
function hovered_elements(event, tag = null) {
// Returns a list of 0-1 elements that mouse is currently hovering over
// Can be expanded to add elements below the top element later
const elements = [];
const element = event.target;
if (element) {
if (tag) {
if (element.tagName === tag) {
// Only add if it's correct tag (For example add only <text>)
elements.push(element);
}
} else if (
element.tagName === "circle" ||
element.tagName === "polyline" ||
element.tagName === "polygon" ||
element.tagName === "text"
) {
elements.push(element);
} // Skip other tags; "line" is used for grid lines
}
return elements;
}
function set_class_for_hovered(event, class_name, tag = null) {
const hovered = hovered_elements(event, tag);
const drawing = document.getElementById("drawing");
for (const element of drawing.children) {
if (hovered.includes(element)) {
element.classList.add(class_name);
} else {
element.classList.remove(class_name);
}
}
}
// Mouse events:
function update_mouse(event) {
mouse = {
target: null,
offsetX: event.offsetX,
offsetY: event.offsetY,
preventDefault: () => {}
};
}
function fake_mouse_move() {
if (mouse != null) {
drawing_mouse_move(mouse);
}
}
function drawingGetXY(event) {
if (event.target === null || event.target.id === "drawing") {
// Either a fake event, or an event on the <svg id="drawing"> element
// In both cases, offsetX and offsetY should be correct:
return { x: event.offsetX, y: event.offsetY };
}
// Some events happen on the lines, circles and polygons inside the svg
// This causes problems, especially in Firefox
// since event offsets are relative to the element
// Thus, we use absolute numbers to calculate the offsets relative to
// drawing
let svg = document.getElementById("drawing").getBoundingClientRect();
let x = event.x - svg.x;
let y = event.y - svg.y;
return { x: x, y: y };
}
function drawing_mouse_down(event) {
event.preventDefault();
update_mouse(event);
let pos = drawingGetXY(event);
let x = "" + round_to_grid(pos.x);
let y = "" + round_to_grid(pos.y);
if (active_tool === "dot") {
remove_dot(x, y); // (If it exists)
place_elements();
// Create temporary element immediately, don't wait for mouse movement:
fake_mouse_move();
} else if (active_tool === "wire") {
drawing_wire_mouse_down(x, y);
} else if (active_tool === "delete") {
drawing_delete_mouse_down(event);
} else if (active_tool === "move") {
drawing_move_mouse_down(event);
} else if (active_tool === "copy") {
drawing_copy_mouse_down(event);
} else if (active_tool === "move") {
drawing_move_mouse_down(event);
} else if (active_tool === "text") {
drawing_text_mouse_down(event);
}
}
function drawing_mouse_up(event) {
event.preventDefault();
update_mouse(event);
let pos = drawingGetXY(event);
let x = "" + round_to_grid(pos.x);
let y = "" + round_to_grid(pos.y);
if (active_tool === "circle") {
place_elements();
// Create temporary circle immediately, don't wait for mouse movement:
fake_mouse_move();
}
}
function drawing_mouse_move(event) {
event.preventDefault();
update_mouse(event);
const mouse_pressed = event.buttons > 0;
let pos = drawingGetXY(event);
let x = "" + round_to_grid(pos.x);
let y = "" + round_to_grid(pos.y);
if (active_tool === "wire") {
drawing_wire_hover(x, y);
} else if (active_tool === "delete") {
drawing_delete_hover(event);
} else if (active_tool === "move") {
drawing_move_hover(event);
} else if (active_tool === "copy") {
drawing_copy_hover(event);
} else if (active_tool === "text") {
drawing_text_hover(event);
} else if (active_tool === "dot") {
drawing_dot_hover(x, y);
} else if (active_tool === "circle" && !mouse_pressed) {
drawing_circle_hover(x, y);
} else if (active_tool === "circle" && mouse_pressed) {
drawing_circle_drag(x, y);
}
}
// Keyboard events:
function text_add(key) {
const elements = get_elements(".to_place");
for (const element of elements) {
if (element.innerHTML === "SAMPLE TEXT") {
// TODO, get rid of this hack:
element.innerHTML = "";
}
element.innerHTML += key;
}
}
function text_backspace() {
const elements = get_elements(".to_place");
for (const element of elements) {
if (element.innerHTML === "SAMPLE TEXT") {
// TODO, get rid of this hack:
element.innerHTML = "";
} else {
const length = element.innerHTML.length;
if (length > 0) {
element.innerHTML = element.innerHTML.slice(0, length - 1);
}
}
}
}
function text_key_down(event) {
const key = event.key;
switch (key) {
case "Shift":
case "Control":
case "Meta":
case "Alt":
break; // Do nothing
case "Escape":
case "Enter":
place_elements();
break;
case "Backspace":
text_backspace();
break;
default:
text_add(key);
break;
}
}
function key_down(event) {
if (active_tool === "text" && get_elements(".to_place").length > 0) {
text_key_down(event);
return;
}
if (event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) {
return;
}
const key = event.key;
switch (key) {
case "ArrowUp":
case "ArrowDown":
case "ArrowLeft":
case "ArrowRight":
case "+":
case "-":
resize(key);
break;
case "1":
case "2":
case "3":
case "4":
subdivide_grid(key);
break;
case "Escape":
remove_elements(".to_place");
unselect_elements();
break;
case "s":
save();
break;
case "w":
case "p":
activate_tool("wire");
break;
case "c":
activate_tool("circle");
break;
case "d":
activate_tool("dot");
break;
case "e":
activate_tool("delete");
break;
case "m":
activate_tool("move");
break;
}
fake_mouse_move();
}
// Functionality related to the left toolbar:
function toolbar(icon_name) {
remove_elements(".to_place");
if (icon_name === "save") {
save();
} else if (icon_name == "load") {
load();
} else {
activate_tool(icon_name);
}
}
function save() {
remove_elements(".to_place");
const copy = document.getElementById("drawing").cloneNode(true);
remove_elements(".grid_line", copy);
for (const element of copy.children) {
element.removeAttribute("id");
element.removeAttribute("class");
}
copy.removeAttribute("class");
const svg_text = copy.outerHTML;
download("schematic.svg", svg_text);
}
function load_svg(content) {
const drawing = document.getElementById("drawing");
drawing.outerHTML = content;
init_ohm();
}
// https://stackoverflow.com/questions/16215771/
function open_file_dialog(on_complete) {
const input = document.createElement("input");
input.type = "file";
input.onchange = e => {
const file = e.target.files[0];
const reader = new FileReader();
reader.readAsText(file, "UTF-8");
reader.onload = readerEvent => {
const content = readerEvent.target.result;
on_complete(content);
};
};
input.click();
}
function load() {
open_file_dialog(load_svg);
}
// Save to file (using browser download):
// From: https://gist.github.com/liabru/11263260#gistcomment-2894088
function download(filename, text) {
const element = document.createElement("a");
element.setAttribute("href", "data:text/plain;charset=utf-8," + encodeURIComponent(text));
element.setAttribute("download", filename);
element.style.display = "none";
document.body.appendChild(element);
element.click();
document.body.removeChild(element);
}
// Dot tool functions:
function create_dot(x, y) {
const drawing = document.getElementById("drawing");
const dot = document.createElementNS("http://www.w3.org/2000/svg", "circle");
dot.classList.add("fill");
dot.setAttribute("cx", x);
dot.setAttribute("cy", y);
dot.setAttribute("r", "10");
dot.setAttribute("stroke-width", "3");
create_element(dot);
}
function update_dot(x, y) {
const elements_to_place = get_elements(".to_place");
console.assert(elements_to_place.length == 1, elements_to_place);
const dot = elements_to_place[0];
dot.setAttribute("cx", x);
dot.setAttribute("cy", y);
}
function drawing_dot_hover(x, y) {
if (no_elements(".to_place")) {
create_dot(x, y);
} else {
update_dot(x, y);
}
}
// Circle & pin tool functions:
function find_dot(x, y) {
const drawing = document.getElementById("drawing");
for (const element of drawing.getElementsByTagName("circle")) {
const cx = element.getAttribute("cx");
const cy = element.getAttribute("cy");
const r = element.getAttribute("r");
const classes = element.classList;
if (!classes.contains("to_place") && cx === x && cy === y && r === "10") {
return element;
}
}
return null;
}
function dot_exists(x, y) {
return find_dot(x, y) != null;
}
function remove_dot(x, y) {
if (dot_exists(x, y)) {
find_dot(x, y).remove();
}
}
function set_circle_small(circle) {
circle.setAttribute("r", "10");
circle.setAttribute("stroke-width", "3");
circle.setAttribute("fill", "white");
circle.setAttribute("stroke", "black");
}
function set_circle_radius(circle, radius) {
circle.setAttribute("r", "" + radius);
circle.setAttribute("stroke-width", "8");
circle.setAttribute("fill", "none");
circle.setAttribute("stroke", "black");
}
function create_circle(x, y) {
const drawing = document.getElementById("drawing");
const circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
circle.setAttribute("cx", x);
circle.setAttribute("cy", y);
set_circle_small(circle);
create_element(circle);
}
function move_circle(x, y) {
const elements_to_place = get_elements(".to_place");
console.assert(elements_to_place.length == 1, elements_to_place);
const circle = elements_to_place[0];
circle.setAttribute("cx", x);
circle.setAttribute("cy", y);
}
function scale_circle(x, y) {
const elements_to_place = get_elements(".to_place");
console.assert(elements_to_place.length == 1, elements_to_place);
const circle = elements_to_place[0];
const cx = circle.getAttribute("cx");
const cy = circle.getAttribute("cy");
const distance_squared = Math.pow(x - cx, 2) + Math.pow(y - cy, 2);
const distance = Math.sqrt(distance_squared);
if (distance < grid_size) {
set_circle_small(circle);
return;
}
set_circle_radius(circle, distance);
}
function drawing_circle_hover(x, y) {
if (no_elements(".to_place")) {
create_circle(x, y);
} else {
move_circle(x, y);
}
}
function drawing_circle_drag(x, y) {
if (no_elements(".to_place")) {
return; // Mouse down event should create element, do nothing
}
scale_circle(x, y);
}
// Delete tool functions:
function drawing_delete_mouse_down(event) {
remove_elements(".to_delete");
}
function drawing_delete_hover(event) {
set_class_for_hovered(event, "to_delete");
}
// Copy/Move tool functions:
function move_element(element, x, y) {
// Move an SVG element to an x,y coordinate
// Doesn't care about grid or previous position
// Only used for text, see translate_element for other elements
x = Number(x);
y = Number(y);
if (element.tagName === "text") {
element.setAttribute("x", x);
element.setAttribute("y", y);
} else {
alert("Cannot move this: " + element.tagName);
}
}
function translate_element(element, x, y) {
x = Number(x);
y = Number(y);
if (element.tagName === "circle") {
const old_x = Number(element.getAttribute("cx"));
const old_y = Number(element.getAttribute("cy"));
element.setAttribute("cx", old_x + x);
element.setAttribute("cy", old_y + y);
} else if (element.tagName === "polygon" || element.tagName === "polyline") {
const points = get_points(element);
for (let i = 0; i < points.length; ++i) {
points[i].x = Number(points[i].x) + x;
points[i].y = Number(points[i].y) + y;
}
element.setAttribute("points", create_points_str(points));
} else {
alert("Cannot move this: " + element.tagName);
}
}
function move_elements(event, elements_to_place) {
for (const element of elements_to_place) {
if (element.tagName === "text") {
move_element(element, event.offsetX, event.offsetY);
} else {
const mouse_x = round_to_grid(event.offsetX);
const mouse_y = round_to_grid(event.offsetY);
const translate_x = mouse_x - translation.past.x;
const translate_y = mouse_y - translation.past.y;
translate_element(element, translate_x, translate_y);
translation.past.x = mouse_x;
translation.past.y = mouse_y;
}
}
}
function create_duplicates(event) {
const elements = hovered_elements(event);
for (const element of elements) {
create_element(element.cloneNode(true));
}
const mouse_x = round_to_grid(event.offsetX);
const mouse_y = round_to_grid(event.offsetY);
translation = {};
translation.past = {};
translation.past.x = mouse_x;
translation.past.y = mouse_y;
}
function drawing_copy_hover(event) {
if (no_elements(".to_place")) {
// No click yet - Make hovered elements green:
set_class_for_hovered(event, "to_edit");
} else {
// Selected elements exist - translate them:
move_elements(event, get_elements(".to_place"));
}
}
function drawing_copy_mouse_down(event) {
if (no_elements(".to_place")) {
// First click - create copies:
create_duplicates(event);
} else {
// Second click - Place copies:
place_elements();
translation = null;
drawing_copy_hover(event);
}
}
function drawing_move_hover(event) {
if (no_elements(".to_place")) {
// No click yet - Make hovered elements green:
set_class_for_hovered(event, "to_edit");
} else {
// Selected elements exist - translate them:
move_elements(event, get_elements(".to_place"));
}
}
function drawing_move_mouse_down(event) {
if (no_elements(".to_place")) {
// First click - create copies:
create_duplicates(event);
} else {
// Second click - Remove originals and place temporary copies:
remove_elements(".to_edit");
place_elements();
translation = null;
drawing_move_hover(event);
}
}
// Text tool functions:
function create_text(x, y) {
const drawing = document.getElementById("drawing");
const text = document.createElementNS("http://www.w3.org/2000/svg", "text");
text.setAttribute("x", x);
text.setAttribute("y", y);
text.setAttribute("text-anchor", "middle");
text.innerHTML = "SAMPLE TEXT";
create_element(text);
}
function drawing_text_mouse_down(event) {
if (no_elements(".to_place")) {
// First click
const originals = get_elements("to_edit");
if (originals.length == 0) {
create_text(event.offsetX, event.offsetY);
} else {
for (const original of originals) {
original.classList.add("to_place");
original.classList.remove("to_edit");
}
}
} else {
place_elements();
}
}
function drawing_text_hover(event) {
if (no_elements(".to_place")) {
// No click yet - Make hovered elements green:
set_class_for_hovered(event, "to_edit", "text");
} else {
// Temporary elements exist - translate them:
move_elements(event, get_elements(".to_place"));
}
}
// Wire tool functions:
function get_points(polyline) {
const points = polyline.getAttribute("points").split(" ");
const results = [];
for (const point of points) {
const coordinates = point.split(",");
const x = coordinates[0];
const y = coordinates[1];
results.push({
x: x,
y: y
});
}
return results;
}
function create_points_str(points) {
let string = "";
for (const point of points) {
string += "" + point.x + "," + point.y + " ";
}
return string.trim();
}
function drawing_wire_mouse_down(x, y) {
if (get_elements(".to_place").length === 0) {
wire_start(x, y);
} else {
const elements_to_place = get_elements(".to_place");
console.assert(elements_to_place.length == 1, elements_to_place);
const wire = get_elements(".to_place")[0];
const points = get_points(wire);
// Get the first point and last point we clicked:
const first = points[0];
const last = points[points.length - 2]; // - 2 because - 1 is the hovering point
// End the wire if you connected with the first, or clicked the same point twice:
if ((first.x === x && first.y === y) || (last.x === x && last.y === y)) {
wire_end();
} else {
wire_continue(x, y);
}
}
}
function drawing_wire_hover(x, y) {
if (get_elements(".to_place").length === 0) {
return;
}
const wire = get_elements(".to_place")[0];
const points = get_points(wire);
points[points.length - 1] = {
x: x,
y: y
};
wire.setAttribute("points", create_points_str(points));
let replace_tag = null;
if (points[0].x === x && points[0].y === y) {
if (wire.tagName === "polyline") {
replace_tag = "polygon";
}
} else {
if (wire.tagName === "polygon") {
replace_tag = "polyline";
}
}
if (replace_tag) {
const new_wire = create_wire(points, "", replace_tag);
create_element(new_wire);
wire.remove();
}
}