Working on line tool

js/_line.js

@@ -0,0 +1,21 @@
+function diagLine(lastMouseClickPos, zoom, cursorLocation) {
+
+    let x0 = Math.floor(lastMouseClickPos[0]/zoom);
+    let y0 = Math.floor(lastMouseClickPos[1]/zoom);
+    let x1 = Math.floor(cursorLocation[0]/zoom);
+    let y1 = Math.floor(cursorLocation[1]/zoom);
+
+	let dx = Math.abs(x1-x0);
+	let dy = Math.abs(y1-y0);
+	let sx = (x0 < x1 ? 1 : -1);
+	let sy = (y0 < y1 ? 1 : -1);
+    let err = dx-dy;
+
+    const brushSize = 1;
+
+	
+    if (currentTool.name !== 'line') return;
+
+    currentLayer.context.fillRect(x0-Math.floor(brushSize/2), y0-Math.floor(brushSize/2), brushSize, brushSize);
+	
+}