1 files changed, 83 insertions, 0 deletions
diff --git a/src/client/views/nodes/Sticky.tsx b/src/client/views/nodes/Sticky.tsx
new file mode 100644
index 000000000..d57dd5c0b
--- /dev/null
+++ b/src/client/views/nodes/Sticky.tsx
@@ -0,0 +1,83 @@
+import 'react-image-lightbox/style.css'; // This only needs to be imported once in your app
+import React = require("react")
+import { observer } from "mobx-react"
+import 'react-pdf/dist/Page/AnnotationLayer.css'
+
+interface IProps {
+    Height: number;
+    Width: number;
+    X: number;
+    Y: number;
+}
+
+/**
+ * Sticky, also known as area highlighting, is used to highlight large selection of the PDF file. 
+ * Improvements that could be made: maybe store line array and store that somewhere for future rerendering. 
+ * 
+ * Written By: Andrew Kim 
+ */
+@observer
+export class Sticky extends React.Component<IProps> {
+
+    private initX: number = 0;
+    private initY: number = 0;
+
+    private _ref = React.createRef<HTMLCanvasElement>();
+    private ctx: any; //context that keeps track of sticky canvas
+
+    /**
+     * drawing. Registers the first point that user clicks when mouse button is pressed down on canvas
+     */
+    drawDown = (e: React.PointerEvent) => {
+        if (this._ref.current) {
+            this.ctx = this._ref.current.getContext("2d");
+            let mouse = e.nativeEvent;
+            this.initX = mouse.offsetX;
+            this.initY = mouse.offsetY;
+            this.ctx.beginPath();
+            this.ctx.lineTo(this.initX, this.initY);
+            this.ctx.strokeStyle = "black";
+            document.addEventListener("pointermove", this.drawMove);
+            document.addEventListener("pointerup", this.drawUp);
+        }
+    }
+
+    //when user drags 
+    drawMove = (e: PointerEvent): void => {
+        //x and y mouse movement
+        let x = this.initX += e.movementX,
+            y = this.initY += e.movementY;
+        //connects the point 
+        this.ctx.lineTo(x, y);
+        this.ctx.stroke();
+
+    }
+
+    /**
+     * when user lifts the mouse, the drawing ends
+     */
+    drawUp = (e: PointerEvent) => {
+        this.ctx.closePath();
+        console.log(this.ctx);
+        document.removeEventListener("pointermove", this.drawMove);
+    }
+
+    render() {
+        return (
+            <div onPointerDown={this.drawDown}>
+                <canvas ref={this._ref} height={this.props.Height} width={this.props.Width}
+                    style={{
+                        position: "absolute",
+                        top: "20px",
+                        left: "0px",
+                        zIndex: 1,
+                        background: "yellow",
+                        transform: `translate(${this.props.X}px, ${this.props.Y}px)`,
+                        opacity: 0.4
+                    }}
+                />
+
+            </div>
+        );
+    }
+}
+\ No newline at end of file