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Extract scene functions to their respective modules (#208)

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- Also, extract utilities into utils module -- capitalizeString, getDateTime, isInputLike
pull/212/head
Gasim Gasimzada 5 years ago committed by GitHub
parent 01805f734d
commit 86a1c29eec
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12 changed files with 695 additions and 530 deletions
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603
src/index.tsx
Unescape Escape View File

@ -1,35 +1,40 @@
import React from "react";
import ReactDOM from "react-dom";
import rough from "roughjs/bin/wrappers/rough";
import { RoughCanvas } from "roughjs/bin/canvas";
import { TwitterPicker } from "react-color";
import { moveOneLeft, moveAllLeft, moveOneRight, moveAllRight } from "./zindex";
import { randomSeed } from "./random";
import { roundRect } from "./roundRect";
import { newElement, resizeTest, generateDraw, isTextElement } from "./element";
import {
newElement,
resizeTest,
generateDraw,
getElementAbsoluteX1,
getElementAbsoluteX2,
getElementAbsoluteY1,
getElementAbsoluteY2,
handlerRectangles,
hitTest,
isTextElement
} from "./element";
import { SceneState } from "./scene/types";
renderScene,
clearSelection,
getSelectedIndices,
deleteSelectedElements,
setSelection,
isOverScrollBars,
someElementIsSelected,
getSelectedAttribute,
loadFromJSON,
saveAsJSON,
exportAsPNG,
restoreFromLocalStorage,
saveToLocalStorage,
hasBackground,
hasStroke,
getElementAtPosition,
createScene
} from "./scene";
import { AppState } from "./types";
import { ExcalidrawElement, ExcalidrawTextElement } from "./element/types";
import { getDateTime, capitalizeString, isInputLike } from "./utils";
import EditableText from "./components/EditableText";
import "./styles.scss";
const LOCAL_STORAGE_KEY = "excalidraw";
const LOCAL_STORAGE_KEY_STATE = "excalidraw-state";
const elements = Array.of<ExcalidrawElement>();
const { elements } = createScene();
const DEFAULT_PROJECT_NAME = `excalidraw-${getDateTime()}`;
@ -63,429 +68,9 @@ function restoreHistoryEntry(entry: string) {
skipHistory = true;
}
const SCROLLBAR_WIDTH = 6;
const SCROLLBAR_MIN_SIZE = 15;
const SCROLLBAR_MARGIN = 4;
const SCROLLBAR_COLOR = "rgba(0,0,0,0.3)";
const CANVAS_WINDOW_OFFSET_LEFT = 250;
const CANVAS_WINDOW_OFFSET_TOP = 0;
function getScrollBars(
canvasWidth: number,
canvasHeight: number,
scrollX: number,
scrollY: number
) {
let minX = Infinity;
let maxX = 0;
let minY = Infinity;
let maxY = 0;
elements.forEach(element => {
minX = Math.min(minX, getElementAbsoluteX1(element));
maxX = Math.max(maxX, getElementAbsoluteX2(element));
minY = Math.min(minY, getElementAbsoluteY1(element));
maxY = Math.max(maxY, getElementAbsoluteY2(element));
});
minX += scrollX;
maxX += scrollX;
minY += scrollY;
maxY += scrollY;
const leftOverflow = Math.max(-minX, 0);
const rightOverflow = Math.max(-(canvasWidth - maxX), 0);
const topOverflow = Math.max(-minY, 0);
const bottomOverflow = Math.max(-(canvasHeight - maxY), 0);
// horizontal scrollbar
let horizontalScrollBar = null;
if (leftOverflow || rightOverflow) {
horizontalScrollBar = {
x: Math.min(
leftOverflow + SCROLLBAR_MARGIN,
canvasWidth - SCROLLBAR_MIN_SIZE - SCROLLBAR_MARGIN
),
y: canvasHeight - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
width: Math.max(
canvasWidth - rightOverflow - leftOverflow - SCROLLBAR_MARGIN * 2,
SCROLLBAR_MIN_SIZE
),
height: SCROLLBAR_WIDTH
};
}
// vertical scrollbar
let verticalScrollBar = null;
if (topOverflow || bottomOverflow) {
verticalScrollBar = {
x: canvasWidth - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
y: Math.min(
topOverflow + SCROLLBAR_MARGIN,
canvasHeight - SCROLLBAR_MIN_SIZE - SCROLLBAR_MARGIN
),
width: SCROLLBAR_WIDTH,
height: Math.max(
canvasHeight - bottomOverflow - topOverflow - SCROLLBAR_WIDTH * 2,
SCROLLBAR_MIN_SIZE
)
};
}
return {
horizontal: horizontalScrollBar,
vertical: verticalScrollBar
};
}
function isOverScrollBars(
x: number,
y: number,
canvasWidth: number,
canvasHeight: number,
scrollX: number,
scrollY: number
) {
const scrollBars = getScrollBars(canvasWidth, canvasHeight, scrollX, scrollY);
const [isOverHorizontalScrollBar, isOverVerticalScrollBar] = [
scrollBars.horizontal,
scrollBars.vertical
].map(
scrollBar =>
scrollBar &&
scrollBar.x <= x &&
x <= scrollBar.x + scrollBar.width &&
scrollBar.y <= y &&
y <= scrollBar.y + scrollBar.height
);
return {
isOverHorizontalScrollBar,
isOverVerticalScrollBar
};
}
function renderScene(
rc: RoughCanvas,
canvas: HTMLCanvasElement,
sceneState: SceneState,
// extra options, currently passed by export helper
{
offsetX,
offsetY,
renderScrollbars = true,
renderSelection = true
}: {
offsetX?: number;
offsetY?: number;
renderScrollbars?: boolean;
renderSelection?: boolean;
} = {}
) {
if (!canvas) return;
const context = canvas.getContext("2d")!;
const fillStyle = context.fillStyle;
if (typeof sceneState.viewBackgroundColor === "string") {
context.fillStyle = sceneState.viewBackgroundColor;
context.fillRect(0, 0, canvas.width, canvas.height);
} else {
context.clearRect(0, 0, canvas.width, canvas.height);
}
context.fillStyle = fillStyle;
const selectedIndices = getSelectedIndices();
sceneState = {
...sceneState,
scrollX: typeof offsetX === "number" ? offsetX : sceneState.scrollX,
scrollY: typeof offsetY === "number" ? offsetY : sceneState.scrollY
};
elements.forEach(element => {
element.draw(rc, context, sceneState);
if (renderSelection && element.isSelected) {
const margin = 4;
const elementX1 = getElementAbsoluteX1(element);
const elementX2 = getElementAbsoluteX2(element);
const elementY1 = getElementAbsoluteY1(element);
const elementY2 = getElementAbsoluteY2(element);
const lineDash = context.getLineDash();
context.setLineDash([8, 4]);
context.strokeRect(
elementX1 - margin + sceneState.scrollX,
elementY1 - margin + sceneState.scrollY,
elementX2 - elementX1 + margin * 2,
elementY2 - elementY1 + margin * 2
);
context.setLineDash(lineDash);
if (element.type !== "text" && selectedIndices.length === 1) {
const handlers = handlerRectangles(element, sceneState);
Object.values(handlers).forEach(handler => {
context.strokeRect(handler[0], handler[1], handler[2], handler[3]);
});
}
}
});
if (renderScrollbars) {
const scrollBars = getScrollBars(
context.canvas.width / window.devicePixelRatio,
context.canvas.height / window.devicePixelRatio,
sceneState.scrollX,
sceneState.scrollY
);
const strokeStyle = context.strokeStyle;
context.fillStyle = SCROLLBAR_COLOR;
context.strokeStyle = "rgba(255,255,255,0.8)";
[scrollBars.horizontal, scrollBars.vertical].forEach(scrollBar => {
if (scrollBar)
roundRect(
context,
scrollBar.x,
scrollBar.y,
scrollBar.width,
scrollBar.height,
SCROLLBAR_WIDTH / 2
);
});
context.strokeStyle = strokeStyle;
context.fillStyle = fillStyle;
}
}
function saveAsJSON(name: string) {
const serialized = JSON.stringify({
version: 1,
source: window.location.origin,
elements
});
saveFile(
`${name}.json`,
"data:text/plain;charset=utf-8," + encodeURIComponent(serialized)
);
}
function loadFromJSON() {
const input = document.createElement("input");
const reader = new FileReader();
input.type = "file";
input.accept = ".json";
input.onchange = () => {
if (!input.files!.length) {
alert("A file was not selected.");
return;
}
reader.readAsText(input.files![0], "utf8");
};
input.click();
return new Promise(resolve => {
reader.onloadend = () => {
if (reader.readyState === FileReader.DONE) {
const data = JSON.parse(reader.result as string);
restore(data.elements, null);
resolve();
}
};
});
}
function exportAsPNG({
exportBackground,
exportPadding = 10,
viewBackgroundColor,
name
}: {
exportBackground: boolean;
exportPadding?: number;
viewBackgroundColor: string;
scrollX: number;
scrollY: number;
name: string;
}) {
if (!elements.length) return window.alert("Cannot export empty canvas.");
// calculate smallest area to fit the contents in
let subCanvasX1 = Infinity;
let subCanvasX2 = 0;
let subCanvasY1 = Infinity;
let subCanvasY2 = 0;
elements.forEach(element => {
subCanvasX1 = Math.min(subCanvasX1, getElementAbsoluteX1(element));
subCanvasX2 = Math.max(subCanvasX2, getElementAbsoluteX2(element));
subCanvasY1 = Math.min(subCanvasY1, getElementAbsoluteY1(element));
subCanvasY2 = Math.max(subCanvasY2, getElementAbsoluteY2(element));
});
function distance(x: number, y: number) {
return Math.abs(x > y ? x - y : y - x);
}
const tempCanvas = document.createElement("canvas");
tempCanvas.style.display = "none";
document.body.appendChild(tempCanvas);
tempCanvas.width = distance(subCanvasX1, subCanvasX2) + exportPadding * 2;
tempCanvas.height = distance(subCanvasY1, subCanvasY2) + exportPadding * 2;
renderScene(
rough.canvas(tempCanvas),
tempCanvas,
{
viewBackgroundColor: exportBackground ? viewBackgroundColor : null,
scrollX: 0,
scrollY: 0
},
{
offsetX: -subCanvasX1 + exportPadding,
offsetY: -subCanvasY1 + exportPadding,
renderScrollbars: false,
renderSelection: false
}
);
saveFile(`${name}.png`, tempCanvas.toDataURL("image/png"));
// clean up the DOM
if (tempCanvas !== canvas) tempCanvas.remove();
}
function saveFile(name: string, data: string) {
// create a temporary <a> elem which we'll use to download the image
const link = document.createElement("a");
link.setAttribute("download", name);
link.setAttribute("href", data);
link.click();
// clean up
link.remove();
}
function getDateTime() {
const date = new Date();
const year = date.getFullYear();
const month = date.getMonth() + 1;
const day = date.getDate();
const hr = date.getHours();
const min = date.getMinutes();
const secs = date.getSeconds();
return `${year}${month}${day}${hr}${min}${secs}`;
}
function isInputLike(
target: Element | EventTarget | null
): target is HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement {
return (
target instanceof HTMLInputElement ||
target instanceof HTMLTextAreaElement ||
target instanceof HTMLSelectElement
);
}
function setSelection(selection: ExcalidrawElement) {
const selectionX1 = getElementAbsoluteX1(selection);
const selectionX2 = getElementAbsoluteX2(selection);
const selectionY1 = getElementAbsoluteY1(selection);
const selectionY2 = getElementAbsoluteY2(selection);
elements.forEach(element => {
const elementX1 = getElementAbsoluteX1(element);
const elementX2 = getElementAbsoluteX2(element);
const elementY1 = getElementAbsoluteY1(element);
const elementY2 = getElementAbsoluteY2(element);
element.isSelected =
element.type !== "selection" &&
selectionX1 <= elementX1 &&
selectionY1 <= elementY1 &&
selectionX2 >= elementX2 &&
selectionY2 >= elementY2;
});
}
function clearSelection() {
elements.forEach(element => {
element.isSelected = false;
});
}
function resetCursor() {
document.documentElement.style.cursor = "";
}
function deleteSelectedElements() {
for (let i = elements.length - 1; i >= 0; --i) {
if (elements[i].isSelected) {
elements.splice(i, 1);
}
}
}
function save(state: AppState) {
localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(elements));
localStorage.setItem(LOCAL_STORAGE_KEY_STATE, JSON.stringify(state));
}
function restoreFromLocalStorage() {
const savedElements = localStorage.getItem(LOCAL_STORAGE_KEY);
const savedState = localStorage.getItem(LOCAL_STORAGE_KEY_STATE);
return restore(savedElements, savedState);
}
function restore(
savedElements: string | ExcalidrawElement[] | null,
savedState: string | null
) {
try {
if (savedElements) {
elements.splice(
0,
elements.length,
...(typeof savedElements === "string"
? JSON.parse(savedElements)
: savedElements)
);
elements.forEach((element: ExcalidrawElement) => {
element.fillStyle = element.fillStyle || "hachure";
element.strokeWidth = element.strokeWidth || 1;
element.roughness = element.roughness || 1;
element.opacity =
element.opacity === null || element.opacity === undefined
? 100
: element.opacity;
generateDraw(element);
});
}
return savedState ? JSON.parse(savedState) : null;
} catch (e) {
elements.splice(0, elements.length);
return null;
}
}
type AppState = {
draggingElement: ExcalidrawElement | null;
resizingElement: ExcalidrawElement | null;
elementType: string;
exportBackground: boolean;
currentItemStrokeColor: string;
currentItemBackgroundColor: string;
viewBackgroundColor: string;
scrollX: number;
scrollY: number;
name: string;
};
const KEYS = {
ARROW_LEFT: "ArrowLeft",
ARROW_RIGHT: "ArrowRight",
@ -556,10 +141,6 @@ const SHAPES = [
const shapesShortcutKeys = SHAPES.map(shape => shape.value[0]);
function capitalize(str: string) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
function findElementByKey(key: string) {
const defaultElement = "selection";
return SHAPES.reduce((element, shape) => {
@ -578,49 +159,8 @@ function isArrowKey(keyCode: string) {
);
}
function getSelectedIndices() {
const selectedIndices: number[] = [];
elements.forEach((element, index) => {
if (element.isSelected) {
selectedIndices.push(index);
}
});
return selectedIndices;
}
const someElementIsSelected = () =>
elements.some(element => element.isSelected);
const hasBackground = () =>
elements.some(
element =>
element.isSelected &&
(element.type === "rectangle" ||
element.type === "ellipse" ||
element.type === "diamond")
);
const hasStroke = () =>
elements.some(
element =>
element.isSelected &&
(element.type === "rectangle" ||
element.type === "ellipse" ||
element.type === "diamond" ||
element.type === "arrow")
);
function getSelectedAttribute<T>(
getAttribute: (element: ExcalidrawElement) => T
): T | null {
const attributes = Array.from(
new Set(
elements
.filter(element => element.isSelected)
.map(element => getAttribute(element))
)
);
return attributes.length === 1 ? attributes[0] : null;
function resetCursor() {
document.documentElement.style.cursor = "";
}
function addTextElement(element: ExcalidrawTextElement) {
@ -651,19 +191,6 @@ function addTextElement(element: ExcalidrawTextElement) {
return true;
}
function getElementAtPosition(x: number, y: number) {
let hitElement = null;
// We need to to hit testing from front (end of the array) to back (beginning of the array)
for (let i = elements.length - 1; i >= 0; --i) {
if (hitTest(elements[i], x, y)) {
hitElement = elements[i];
break;
}
}
return hitElement;
}
function ButtonSelect<T>({
options,
value,
@ -751,7 +278,7 @@ class App extends React.Component<{}, AppState> {
document.addEventListener("keydown", this.onKeyDown, false);
window.addEventListener("resize", this.onResize, false);
const savedState = restoreFromLocalStorage();
const savedState = restoreFromLocalStorage(elements);
if (savedState) {
this.setState(savedState);
}
@ -783,11 +310,11 @@ class App extends React.Component<{}, AppState> {
if (isInputLike(event.target)) return;
if (event.key === KEYS.ESCAPE) {
clearSelection();
clearSelection(elements);
this.forceUpdate();
event.preventDefault();
} else if (event.key === KEYS.BACKSPACE || event.key === KEYS.DELETE) {
deleteSelectedElements();
deleteSelectedElements(elements);
this.forceUpdate();
event.preventDefault();
} else if (isArrowKey(event.key)) {
@ -871,7 +398,7 @@ class App extends React.Component<{}, AppState> {
};
private deleteSelectedElements = () => {
deleteSelectedElements();
deleteSelectedElements(elements);
this.forceUpdate();
};
@ -888,22 +415,22 @@ class App extends React.Component<{}, AppState> {
};
private moveAllLeft = () => {
moveAllLeft(elements, getSelectedIndices());
moveAllLeft(elements, getSelectedIndices(elements));
this.forceUpdate();
};
private moveOneLeft = () => {
moveOneLeft(elements, getSelectedIndices());
moveOneLeft(elements, getSelectedIndices(elements));
this.forceUpdate();
};
private moveAllRight = () => {
moveAllRight(elements, getSelectedIndices());
moveAllRight(elements, getSelectedIndices(elements));
this.forceUpdate();
};
private moveOneRight = () => {
moveOneRight(elements, getSelectedIndices());
moveOneRight(elements, getSelectedIndices(elements));
this.forceUpdate();
};
@ -950,7 +477,7 @@ class App extends React.Component<{}, AppState> {
"text/plain",
JSON.stringify(elements.filter(element => element.isSelected))
);
deleteSelectedElements();
deleteSelectedElements(elements);
this.forceUpdate();
e.preventDefault();
}}
@ -972,7 +499,7 @@ class App extends React.Component<{}, AppState> {
parsedElements.length > 0 &&
parsedElements[0].type // need to implement a better check here...
) {
clearSelection();
clearSelection(elements);
parsedElements.forEach(parsedElement => {
parsedElement.x += 10;
parsedElement.y += 10;
@ -992,14 +519,16 @@ class App extends React.Component<{}, AppState> {
<label
key={value}
className="tool"
title={`${capitalize(value)} - ${capitalize(value)[0]}`}
title={`${capitalizeString(value)} - ${
capitalizeString(value)[0]
}`}
>
<input
type="radio"
checked={this.state.elementType === value}
onChange={() => {
this.setState({ elementType: value });
clearSelection();
clearSelection(elements);
document.documentElement.style.cursor =
value === "text" ? "text" : "crosshair";
this.forceUpdate();
@ -1009,7 +538,7 @@ class App extends React.Component<{}, AppState> {
</label>
))}
</div>
{someElementIsSelected() && (
{someElementIsSelected(elements) && (
<div className="panelColumn">
<h4>Selection</h4>
<div className="buttonList">
@ -1020,15 +549,19 @@ class App extends React.Component<{}, AppState> {
</div>
<h5>Stroke Color</h5>
<ColorPicker
color={getSelectedAttribute(element => element.strokeColor)}
color={getSelectedAttribute(
elements,
element => element.strokeColor
)}
onChange={color => this.changeStrokeColor(color)}
/>
{hasBackground() && (
{hasBackground(elements) && (
<>
<h5>Background Color</h5>
<ColorPicker
color={getSelectedAttribute(
elements,
element => element.backgroundColor
)}
onChange={color => this.changeBackgroundColor(color)}
@ -1040,7 +573,10 @@ class App extends React.Component<{}, AppState> {
{ value: "hachure", text: "Hachure" },
{ value: "cross-hatch", text: "Cross-hatch" }
]}
value={getSelectedAttribute(element => element.fillStyle)}
value={getSelectedAttribute(
elements,
element => element.fillStyle
)}
onChange={value => {
this.changeProperty(element => {
element.fillStyle = value;
@ -1050,7 +586,7 @@ class App extends React.Component<{}, AppState> {
</>
)}
{hasStroke() && (
{hasStroke(elements) && (
<>
<h5>Stroke Width</h5>
<ButtonSelect
@ -1059,7 +595,10 @@ class App extends React.Component<{}, AppState> {
{ value: 2, text: "Bold" },
{ value: 4, text: "Extra Bold" }
]}
value={getSelectedAttribute(element => element.strokeWidth)}
value={getSelectedAttribute(
elements,
element => element.strokeWidth
)}
onChange={value => {
this.changeProperty(element => {
element.strokeWidth = value;
@ -1074,7 +613,10 @@ class App extends React.Component<{}, AppState> {
{ value: 1, text: "Artist" },
{ value: 3, text: "Cartoonist" }
]}
value={getSelectedAttribute(element => element.roughness)}
value={getSelectedAttribute(
elements,
element => element.roughness
)}
onChange={value =>
this.changeProperty(element => {
element.roughness = value;
@ -1091,7 +633,7 @@ class App extends React.Component<{}, AppState> {
max="100"
onChange={this.changeOpacity}
value={
getSelectedAttribute(element => element.opacity) ||
getSelectedAttribute(elements, element => element.opacity) ||
0 /* Put the opacity at 0 if there are two conflicting ones */
}
/>
@ -1127,7 +669,7 @@ class App extends React.Component<{}, AppState> {
<h5>Image</h5>
<button
onClick={() => {
exportAsPNG(this.state);
exportAsPNG(elements, canvas, this.state);
}}
>
Export to png
@ -1145,14 +687,14 @@ class App extends React.Component<{}, AppState> {
<h5>Scene</h5>
<button
onClick={() => {
saveAsJSON(this.state.name);
saveAsJSON(elements, this.state.name);
}}
>
Save as...
</button>
<button
onClick={() => {
loadFromJSON().then(() => this.forceUpdate());
loadFromJSON(elements).then(() => this.forceUpdate());
}}
>
Load file...
@ -1216,6 +758,7 @@ class App extends React.Component<{}, AppState> {
isOverHorizontalScrollBar,
isOverVerticalScrollBar
} = isOverScrollBars(
elements,
e.clientX - CANVAS_WINDOW_OFFSET_LEFT,
e.clientY - CANVAS_WINDOW_OFFSET_TOP,
canvasWidth,
@ -1263,7 +806,7 @@ class App extends React.Component<{}, AppState> {
document.documentElement.style.cursor = `${resizeHandle}-resize`;
isResizingElements = true;
} else {
const hitElement = getElementAtPosition(x, y);
const hitElement = getElementAtPosition(elements, x, y);
// If we click on something
if (hitElement) {
@ -1273,17 +816,17 @@ class App extends React.Component<{}, AppState> {
} else {
// We unselect every other elements unless shift is pressed
if (!e.shiftKey) {
clearSelection();
clearSelection(elements);
}
// No matter what, we select it
hitElement.isSelected = true;
}
} else {
// If we don't click on anything, let's remove all the selected elements
clearSelection();
clearSelection(elements);
}
isDraggingElements = someElementIsSelected();
isDraggingElements = someElementIsSelected(elements);
if (isDraggingElements) {
document.documentElement.style.cursor = "move";
@ -1445,7 +988,7 @@ class App extends React.Component<{}, AppState> {
generateDraw(draggingElement);
if (this.state.elementType === "selection") {
setSelection(draggingElement);
setSelection(elements, draggingElement);
}
// We don't want to save history when moving an element
skipHistory = true;
@ -1463,7 +1006,7 @@ class App extends React.Component<{}, AppState> {
// if no element is clicked, clear the selection and redraw
if (draggingElement === null) {
clearSelection();
clearSelection(elements);
this.forceUpdate();
return;
}
@ -1498,7 +1041,7 @@ class App extends React.Component<{}, AppState> {
e.clientX - CANVAS_WINDOW_OFFSET_LEFT - this.state.scrollX;
const y = e.clientY - CANVAS_WINDOW_OFFSET_TOP - this.state.scrollY;
if (getElementAtPosition(x, y)) {
if (getElementAtPosition(elements, x, y)) {
return;
}
@ -1544,12 +1087,12 @@ class App extends React.Component<{}, AppState> {
};
componentDidUpdate() {
renderScene(rc, canvas, {
renderScene(elements, rc, canvas, {
scrollX: this.state.scrollX,
scrollY: this.state.scrollY,
viewBackgroundColor: this.state.viewBackgroundColor
});
save(this.state);
saveToLocalStorage(elements, this.state);
if (!skipHistory) {
pushHistoryEntry(generateHistoryCurrentEntry());
redoStack.splice(0, redoStack.length);

38
src/scene/comparisons.ts
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@ -0,0 +1,38 @@
import { ExcalidrawElement } from "../element/types";
import { hitTest } from "../element/collision";
export const hasBackground = (elements: ExcalidrawElement[]) =>
elements.some(
element =>
element.isSelected &&
(element.type === "rectangle" ||
element.type === "ellipse" ||
element.type === "diamond")
);
export const hasStroke = (elements: ExcalidrawElement[]) =>
elements.some(
element =>
element.isSelected &&
(element.type === "rectangle" ||
element.type === "ellipse" ||
element.type === "diamond" ||
element.type === "arrow")
);
export function getElementAtPosition(
elements: ExcalidrawElement[],
x: number,
y: number
) {
let hitElement = null;
// We need to to hit testing from front (end of the array) to back (beginning of the array)
for (let i = elements.length - 1; i >= 0; --i) {
if (hitTest(elements[i], x, y)) {
hitElement = elements[i];
break;
}
}
return hitElement;
}

6
src/scene/createScene.ts
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@ -0,0 +1,6 @@
import { ExcalidrawElement } from "../element/types";
export const createScene = () => {
const elements = Array.of<ExcalidrawElement>();
return { elements };
};

183
src/scene/data.ts
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import rough from "roughjs/bin/wrappers/rough";
import { ExcalidrawElement } from "../element/types";
import {
getElementAbsoluteX1,
getElementAbsoluteX2,
getElementAbsoluteY1,
getElementAbsoluteY2,
generateDraw
} from "../element";
import { renderScene } from "./render";
import { AppState } from "../types";
const LOCAL_STORAGE_KEY = "excalidraw";
const LOCAL_STORAGE_KEY_STATE = "excalidraw-state";
function saveFile(name: string, data: string) {
// create a temporary <a> elem which we'll use to download the image
const link = document.createElement("a");
link.setAttribute("download", name);
link.setAttribute("href", data);
link.click();
// clean up
link.remove();
}
export function saveAsJSON(elements: ExcalidrawElement[], name: string) {
const serialized = JSON.stringify({
version: 1,
source: window.location.origin,
elements
});
saveFile(
`${name}.json`,
"data:text/plain;charset=utf-8," + encodeURIComponent(serialized)
);
}
export function loadFromJSON(elements: ExcalidrawElement[]) {
const input = document.createElement("input");
const reader = new FileReader();
input.type = "file";
input.accept = ".json";
input.onchange = () => {
if (!input.files!.length) {
alert("A file was not selected.");
return;
}
reader.readAsText(input.files![0], "utf8");
};
input.click();
return new Promise(resolve => {
reader.onloadend = () => {
if (reader.readyState === FileReader.DONE) {
const data = JSON.parse(reader.result as string);
restore(elements, data.elements, null);
resolve();
}
};
});
}
export function exportAsPNG(
elements: ExcalidrawElement[],
canvas: HTMLCanvasElement,
{
exportBackground,
exportPadding = 10,
viewBackgroundColor,
name
}: {
exportBackground: boolean;
exportPadding?: number;
viewBackgroundColor: string;
scrollX: number;
scrollY: number;
name: string;
}
) {
if (!elements.length) return window.alert("Cannot export empty canvas.");
// calculate smallest area to fit the contents in
let subCanvasX1 = Infinity;
let subCanvasX2 = 0;
let subCanvasY1 = Infinity;
let subCanvasY2 = 0;
elements.forEach(element => {
subCanvasX1 = Math.min(subCanvasX1, getElementAbsoluteX1(element));
subCanvasX2 = Math.max(subCanvasX2, getElementAbsoluteX2(element));
subCanvasY1 = Math.min(subCanvasY1, getElementAbsoluteY1(element));
subCanvasY2 = Math.max(subCanvasY2, getElementAbsoluteY2(element));
});
function distance(x: number, y: number) {
return Math.abs(x > y ? x - y : y - x);
}
const tempCanvas = document.createElement("canvas");
tempCanvas.style.display = "none";
document.body.appendChild(tempCanvas);
tempCanvas.width = distance(subCanvasX1, subCanvasX2) + exportPadding * 2;
tempCanvas.height = distance(subCanvasY1, subCanvasY2) + exportPadding * 2;
renderScene(
elements,
rough.canvas(tempCanvas),
tempCanvas,
{
viewBackgroundColor: exportBackground ? viewBackgroundColor : null,
scrollX: 0,
scrollY: 0
},
{
offsetX: -subCanvasX1 + exportPadding,
offsetY: -subCanvasY1 + exportPadding,
renderScrollbars: false,
renderSelection: false
}
);
saveFile(`${name}.png`, tempCanvas.toDataURL("image/png"));
// clean up the DOM
if (tempCanvas !== canvas) tempCanvas.remove();
}
function restore(
elements: ExcalidrawElement[],
savedElements: string | ExcalidrawElement[] | null,
savedState: string | null
) {
try {
if (savedElements) {
elements.splice(
0,
elements.length,
...(typeof savedElements === "string"
? JSON.parse(savedElements)
: savedElements)
);
elements.forEach((element: ExcalidrawElement) => {
element.fillStyle = element.fillStyle || "hachure";
element.strokeWidth = element.strokeWidth || 1;
element.roughness = element.roughness || 1;
element.opacity =
element.opacity === null || element.opacity === undefined
? 100
: element.opacity;
generateDraw(element);
});
}
return savedState ? JSON.parse(savedState) : null;
} catch (e) {
elements.splice(0, elements.length);
return null;
}
}
export function restoreFromLocalStorage(elements: ExcalidrawElement[]) {
const savedElements = localStorage.getItem(LOCAL_STORAGE_KEY);
const savedState = localStorage.getItem(LOCAL_STORAGE_KEY_STATE);
return restore(elements, savedElements, savedState);
}
export function saveToLocalStorage(
elements: ExcalidrawElement[],
state: AppState
) {
localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(elements));
localStorage.setItem(LOCAL_STORAGE_KEY_STATE, JSON.stringify(state));
}

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src/scene/index.ts
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export { isOverScrollBars } from "./scrollbars";
export { renderScene } from "./render";
export {
clearSelection,
getSelectedIndices,
deleteSelectedElements,
someElementIsSelected,
setSelection,
getSelectedAttribute
} from "./selection";
export {
exportAsPNG,
loadFromJSON,
saveAsJSON,
restoreFromLocalStorage,
saveToLocalStorage
} from "./data";
export { hasBackground, hasStroke, getElementAtPosition } from "./comparisons";
export { createScene } from "./createScene";

109
src/scene/render.ts
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import { RoughCanvas } from "roughjs/bin/canvas";
import { ExcalidrawElement } from "../element/types";
import {
getElementAbsoluteX1,
getElementAbsoluteX2,
getElementAbsoluteY1,
getElementAbsoluteY2,
handlerRectangles
} from "../element";
import { roundRect } from "./roundRect";
import { SceneState } from "./types";
import { getScrollBars, SCROLLBAR_COLOR, SCROLLBAR_WIDTH } from "./scrollbars";
import { getSelectedIndices } from "./selection";
export function renderScene(
elements: ExcalidrawElement[],
rc: RoughCanvas,
canvas: HTMLCanvasElement,
sceneState: SceneState,
// extra options, currently passed by export helper
{
offsetX,
offsetY,
renderScrollbars = true,
renderSelection = true
}: {
offsetX?: number;
offsetY?: number;
renderScrollbars?: boolean;
renderSelection?: boolean;
} = {}
) {
if (!canvas) return;
const context = canvas.getContext("2d")!;
const fillStyle = context.fillStyle;
if (typeof sceneState.viewBackgroundColor === "string") {
context.fillStyle = sceneState.viewBackgroundColor;
context.fillRect(0, 0, canvas.width, canvas.height);
} else {
context.clearRect(0, 0, canvas.width, canvas.height);
}
context.fillStyle = fillStyle;
const selectedIndices = getSelectedIndices(elements);
sceneState = {
...sceneState,
scrollX: typeof offsetX === "number" ? offsetX : sceneState.scrollX,
scrollY: typeof offsetY === "number" ? offsetY : sceneState.scrollY
};
elements.forEach(element => {
element.draw(rc, context, sceneState);
if (renderSelection && element.isSelected) {
const margin = 4;
const elementX1 = getElementAbsoluteX1(element);
const elementX2 = getElementAbsoluteX2(element);
const elementY1 = getElementAbsoluteY1(element);
const elementY2 = getElementAbsoluteY2(element);
const lineDash = context.getLineDash();
context.setLineDash([8, 4]);
context.strokeRect(
elementX1 - margin + sceneState.scrollX,
elementY1 - margin + sceneState.scrollY,
elementX2 - elementX1 + margin * 2,
elementY2 - elementY1 + margin * 2
);
context.setLineDash(lineDash);
if (element.type !== "text" && selectedIndices.length === 1) {
const handlers = handlerRectangles(element, sceneState);
Object.values(handlers).forEach(handler => {
context.strokeRect(handler[0], handler[1], handler[2], handler[3]);
});
}
}
});
if (renderScrollbars) {
const scrollBars = getScrollBars(
elements,
context.canvas.width / window.devicePixelRatio,
context.canvas.height / window.devicePixelRatio,
sceneState.scrollX,
sceneState.scrollY
);
const strokeStyle = context.strokeStyle;
context.fillStyle = SCROLLBAR_COLOR;
context.strokeStyle = "rgba(255,255,255,0.8)";
[scrollBars.horizontal, scrollBars.vertical].forEach(scrollBar => {
if (scrollBar)
roundRect(
context,
scrollBar.x,
scrollBar.y,
scrollBar.width,
scrollBar.height,
SCROLLBAR_WIDTH / 2
);
});
context.strokeStyle = strokeStyle;
context.fillStyle = fillStyle;
}
}

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src/scene/roundRect.ts
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/**
* https://stackoverflow.com/a/3368118
* Draws a rounded rectangle using the current state of the canvas.
* @param {CanvasRenderingContext2D} context
* @param {Number} x The top left x coordinate
* @param {Number} y The top left y coordinate
* @param {Number} width The width of the rectangle
* @param {Number} height The height of the rectangle
* @param {Number} radius The corner radius
*/
export function roundRect(
context: CanvasRenderingContext2D,
x: number,
y: number,
width: number,
height: number,
radius: number
) {
context.beginPath();
context.moveTo(x + radius, y);
context.lineTo(x + width - radius, y);
context.quadraticCurveTo(x + width, y, x + width, y + radius);
context.lineTo(x + width, y + height - radius);
context.quadraticCurveTo(
x + width,
y + height,
x + width - radius,
y + height
);
context.lineTo(x + radius, y + height);
context.quadraticCurveTo(x, y + height, x, y + height - radius);
context.lineTo(x, y + radius);
context.quadraticCurveTo(x, y, x + radius, y);
context.closePath();
context.fill();
context.stroke();
}

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src/scene/scrollbars.ts
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import { ExcalidrawElement } from "../element/types";
import {
getElementAbsoluteX1,
getElementAbsoluteX2,
getElementAbsoluteY1,
getElementAbsoluteY2
} from "../element";
const SCROLLBAR_MIN_SIZE = 15;
const SCROLLBAR_MARGIN = 4;
export const SCROLLBAR_WIDTH = 6;
export const SCROLLBAR_COLOR = "rgba(0,0,0,0.3)";
export function getScrollBars(
elements: ExcalidrawElement[],
canvasWidth: number,
canvasHeight: number,
scrollX: number,
scrollY: number
) {
let minX = Infinity;
let maxX = 0;
let minY = Infinity;
let maxY = 0;
elements.forEach(element => {
minX = Math.min(minX, getElementAbsoluteX1(element));
maxX = Math.max(maxX, getElementAbsoluteX2(element));
minY = Math.min(minY, getElementAbsoluteY1(element));
maxY = Math.max(maxY, getElementAbsoluteY2(element));
});
minX += scrollX;
maxX += scrollX;
minY += scrollY;
maxY += scrollY;
const leftOverflow = Math.max(-minX, 0);
const rightOverflow = Math.max(-(canvasWidth - maxX), 0);
const topOverflow = Math.max(-minY, 0);
const bottomOverflow = Math.max(-(canvasHeight - maxY), 0);
// horizontal scrollbar
let horizontalScrollBar = null;
if (leftOverflow || rightOverflow) {
horizontalScrollBar = {
x: Math.min(
leftOverflow + SCROLLBAR_MARGIN,
canvasWidth - SCROLLBAR_MIN_SIZE - SCROLLBAR_MARGIN
),
y: canvasHeight - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
width: Math.max(
canvasWidth - rightOverflow - leftOverflow - SCROLLBAR_MARGIN * 2,
SCROLLBAR_MIN_SIZE
),
height: SCROLLBAR_WIDTH
};
}
// vertical scrollbar
let verticalScrollBar = null;
if (topOverflow || bottomOverflow) {
verticalScrollBar = {
x: canvasWidth - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
y: Math.min(
topOverflow + SCROLLBAR_MARGIN,
canvasHeight - SCROLLBAR_MIN_SIZE - SCROLLBAR_MARGIN
),
width: SCROLLBAR_WIDTH,
height: Math.max(
canvasHeight - bottomOverflow - topOverflow - SCROLLBAR_WIDTH * 2,
SCROLLBAR_MIN_SIZE
)
};
}
return {
horizontal: horizontalScrollBar,
vertical: verticalScrollBar
};
}
export function isOverScrollBars(
elements: ExcalidrawElement[],
x: number,
y: number,
canvasWidth: number,
canvasHeight: number,
scrollX: number,
scrollY: number
) {
const scrollBars = getScrollBars(
elements,
canvasWidth,
canvasHeight,
scrollX,
scrollY
);
const [isOverHorizontalScrollBar, isOverVerticalScrollBar] = [
scrollBars.horizontal,
scrollBars.vertical
].map(
scrollBar =>
scrollBar &&
scrollBar.x <= x &&
x <= scrollBar.x + scrollBar.width &&
scrollBar.y <= y &&
y <= scrollBar.y + scrollBar.height
);
return {
isOverHorizontalScrollBar,
isOverVerticalScrollBar
};
}

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src/scene/selection.ts
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import { ExcalidrawElement } from "../element/types";
import {
getElementAbsoluteX1,
getElementAbsoluteX2,
getElementAbsoluteY1,
getElementAbsoluteY2
} from "../element";
export function setSelection(
elements: ExcalidrawElement[],
selection: ExcalidrawElement
) {
const selectionX1 = getElementAbsoluteX1(selection);
const selectionX2 = getElementAbsoluteX2(selection);
const selectionY1 = getElementAbsoluteY1(selection);
const selectionY2 = getElementAbsoluteY2(selection);
elements.forEach(element => {
const elementX1 = getElementAbsoluteX1(element);
const elementX2 = getElementAbsoluteX2(element);
const elementY1 = getElementAbsoluteY1(element);
const elementY2 = getElementAbsoluteY2(element);
element.isSelected =
element.type !== "selection" &&
selectionX1 <= elementX1 &&
selectionY1 <= elementY1 &&
selectionX2 >= elementX2 &&
selectionY2 >= elementY2;
});
}
export function clearSelection(elements: ExcalidrawElement[]) {
elements.forEach(element => {
element.isSelected = false;
});
}
export function deleteSelectedElements(elements: ExcalidrawElement[]) {
for (let i = elements.length - 1; i >= 0; --i) {
if (elements[i].isSelected) {
elements.splice(i, 1);
}
}
}
export function getSelectedIndices(elements: ExcalidrawElement[]) {
const selectedIndices: number[] = [];
elements.forEach((element, index) => {
if (element.isSelected) {
selectedIndices.push(index);
}
});
return selectedIndices;
}
export const someElementIsSelected = (elements: ExcalidrawElement[]) =>
elements.some(element => element.isSelected);
export function getSelectedAttribute<T>(
elements: ExcalidrawElement[],
getAttribute: (element: ExcalidrawElement) => T
): T | null {
const attributes = Array.from(
new Set(
elements
.filter(element => element.isSelected)
.map(element => getAttribute(element))
)
);
return attributes.length === 1 ? attributes[0] : null;
}

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src/scene/types.ts
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import { ExcalidrawTextElement } from "../element/types";
export type SceneState = {
scrollX: number;
scrollY: number;
// null indicates transparent bg
viewBackgroundColor: string | null;
};
export interface Scene {
elements: ExcalidrawTextElement[];
}

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src/types.ts
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import { ExcalidrawElement } from "./element/types";
export type AppState = {
draggingElement: ExcalidrawElement | null;
resizingElement: ExcalidrawElement | null;
elementType: string;
exportBackground: boolean;
currentItemStrokeColor: string;
currentItemBackgroundColor: string;
viewBackgroundColor: string;
scrollX: number;
scrollY: number;
name: string;
};

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src/utils.ts
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export function getDateTime() {
const date = new Date();
const year = date.getFullYear();
const month = date.getMonth() + 1;
const day = date.getDate();
const hr = date.getHours();
const min = date.getMinutes();
const secs = date.getSeconds();
return `${year}${month}${day}${hr}${min}${secs}`;
}
export function capitalizeString(str: string) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
export function isInputLike(
target: Element | EventTarget | null
): target is HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement {
return (
target instanceof HTMLInputElement ||
target instanceof HTMLTextAreaElement ||
target instanceof HTMLSelectElement
);
}
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