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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,108 +1,143 @@ | ||
| const canvas = document.getElementById("canvas"); | ||
| const sizeElement = document.getElementById("size"); | ||
| const colorElement = document.getElementById("color"); | ||
| const clearElement = document.getElementById("clear"); | ||
| const increaseButton = document.getElementById("increase"); | ||
| const decreaseButton = document.getElementById("decrease"); | ||
| const redoButton = document.getElementById("redo"); | ||
| const undoButton = document.getElementById("undo"); | ||
| const ctx = canvas.getContext("2d"); | ||
| function setUpCanvas() { | ||
| const canvas = document.getElementById("canvas"); | ||
| const ctx = canvas.getContext("2d"); | ||
| ctx.translate(0.5, 0.5); | ||
| var sizeWidth = (100 * window.innerWidth) / 100 - 60, | ||
| sizeHeight = (100 * window.innerHeight) / 100 || 766; | ||
| canvas.width = sizeWidth; | ||
| canvas.height = sizeHeight; | ||
| canvas.style.width = sizeWidth; | ||
| canvas.style.height = sizeHeight; | ||
| } | ||
|
|
||
| window.onload = setUpCanvas(); | ||
| const sizeEl = document.getElementById("size"); | ||
| const colorEl = document.getElementById("color"); | ||
| const clearEl = document.getElementById("clear"); | ||
| const increaseBtn = document.getElementById("increase"); | ||
| const decreaseBtn = document.getElementById("decrease"); | ||
| // Resize the canvas | ||
| function resizeCanvas() { | ||
| canvas.width = window.innerWidth - 170; | ||
| canvas.height = window.innerHeight - 40; | ||
| } | ||
| window.addEventListener("resize", resizeCanvas); | ||
| resizeCanvas(); | ||
|
|
||
| let size = 1; | ||
| let x = undefined; | ||
| let y = undefined; | ||
| let color = "black"; | ||
| let isPressed = false; | ||
|
|
||
| canvas.addEventListener("mousedown", (e) => { | ||
| isPressed = true; | ||
|
|
||
| x = e.offsetX; | ||
| y = e.offsetY; | ||
| // Update the Color of the brush | ||
| colorElement.addEventListener("change", (e) => { | ||
| color = e.target.value; | ||
| }); | ||
|
|
||
| canvas.addEventListener("mouseup", () => { | ||
| isPressed = false; | ||
|
|
||
| x = undefined; | ||
| y = undefined; | ||
| }); | ||
| let size = 1; | ||
|
|
||
| // Update the size of the brush on the screen using input Field | ||
| function updateValue(e) { | ||
| const newSize = parseInt(e.target.value, 10); | ||
|
|
||
| // Check if parsing was successful and newSize is a valid integer | ||
| if (!isNaN(newSize)) { | ||
| size = newSize; | ||
| sizeEl.value = size; | ||
| sizeElement.value = size; | ||
| } else { | ||
| console.log("Invalid input. Please enter a numeric value."); | ||
| } | ||
| } | ||
|
|
||
| canvas.addEventListener("mousemove", (e) => { | ||
| if (isPressed) { | ||
| const x2 = e.offsetX; | ||
| const y2 = e.offsetY; | ||
|
|
||
| drawCircle(x2, y2); | ||
| drawLine(x, y, x2, y2); | ||
| x = x2; | ||
| y = y2; | ||
| } | ||
| }); | ||
|
|
||
| function drawCircle(x, y) { | ||
| ctx.beginPath(); | ||
| ctx.arc(x, y, size, 0, Math.PI * 2); | ||
| ctx.fillStyle = color; | ||
| ctx.fill(); | ||
| } | ||
|
|
||
| function drawLine(x1, y1, x2, y2) { | ||
| ctx.beginPath(); | ||
| ctx.moveTo(x1, y1); | ||
| ctx.lineTo(x2, y2); | ||
| ctx.strokeStyle = color; | ||
| ctx.lineWidth = size * 2; | ||
| ctx.stroke(); | ||
| } | ||
|
|
||
| increaseBtn.addEventListener("click", () => { | ||
| // Increase and decrease the size of the brush using buttons | ||
| increaseButton.addEventListener("click", () => { | ||
| size += 1; | ||
|
|
||
| if (size > 50) { | ||
| size = 50; | ||
| } | ||
| sizeEl.value = size; | ||
| sizeElement.value = size; | ||
| updateSizeOnScreen(); | ||
| }); | ||
|
|
||
| decreaseBtn.addEventListener("click", () => { | ||
| decreaseButton.addEventListener("click", () => { | ||
| size -= 1; | ||
|
|
||
| if (size < 1) { | ||
| size = 1; | ||
| } | ||
| sizeEl.value = size; | ||
| sizeElement.value = size; | ||
| updateSizeOnScreen(); | ||
| }); | ||
|
|
||
| colorEl.addEventListener("change", (e) => { | ||
| color = e.target.value; | ||
| // Drawing Constraints | ||
| let isDrawing = false; | ||
| let lines = []; | ||
| let undoStack = []; | ||
| let points = []; | ||
| var mouse = { x: 0, y: 0 }; | ||
| var previous = { x: 0, y: 0 }; | ||
|
|
||
| // Drawing Functionality | ||
| canvas.addEventListener("mousedown", (e) => { | ||
| isDrawing = true; | ||
| previous = { x: mouse.x, y: mouse.y }; | ||
| mouse = mousePos(canvas, e); | ||
| points = []; | ||
| points.push({ x: mouse.x, y: mouse.y }); | ||
| }); | ||
|
|
||
| canvas.addEventListener("mousemove", (e) => { | ||
| if (isDrawing) { | ||
| previous = { x: mouse.x, y: mouse.y }; | ||
| mouse = mousePos(canvas, e); | ||
| points.push({ x: mouse.x, y: mouse.y }); | ||
| ctx.beginPath(); | ||
| ctx.moveTo(previous.x, previous.y); | ||
| ctx.lineTo(mouse.x, mouse.y); | ||
| ctx.strokeStyle = color; | ||
| ctx.lineWidth = size; | ||
| ctx.lineCap = "round"; | ||
| ctx.stroke(); | ||
| } | ||
| }); | ||
|
|
||
| canvas.addEventListener("mouseup", (e) => { | ||
| isDrawing = false; | ||
| lines.push(points); | ||
| console.log(lines); | ||
| }); | ||
|
|
||
| clearEl.addEventListener("click", () => { | ||
| // Helps to clear everything on the canvas | ||
| clearElement.addEventListener("click", () => { | ||
| ctx.clearRect(0, 0, canvas.width, canvas.height); | ||
| }); | ||
|
|
||
| // Undo Redo Event Listeners | ||
| undoButton.addEventListener("click", Undo); | ||
| redoButton.addEventListener("click", redo); | ||
|
|
||
| // Function to find the mouse position | ||
| function mousePos(canvas, e) { | ||
| var ClientRect = canvas.getBoundingClientRect(); | ||
| return { | ||
| x: Math.round(e.clientX - ClientRect.left), | ||
| y: Math.round(e.clientY - ClientRect.top), | ||
| }; | ||
| } | ||
|
|
||
| // Function to draw the paths again on the canvas | ||
| function drawPaths() { | ||
| ctx.clearRect(0, 0, canvas.width, canvas.height); | ||
| lines.forEach((path) => { | ||
| ctx.beginPath(); | ||
| ctx.moveTo(path[0].x, path[0].y); | ||
| for (let i = 1; i < path.length; i++) { | ||
| ctx.lineTo(path[i].x, path[i].y); | ||
| } | ||
| ctx.strokeStyle = color; | ||
| ctx.lineWidth = size; | ||
| ctx.lineCap = "round"; | ||
| ctx.stroke(); | ||
| }); | ||
| } | ||
|
|
||
| // Undo Redo Functionality | ||
| function Undo() { | ||
| if (lines.length === 0) return; | ||
| undoStack.push(lines.pop()); | ||
| drawPaths(); | ||
| } | ||
| function redo() { | ||
| if (undoStack.length === 0) return; | ||
| lines.push(undoStack.pop()); | ||
| drawPaths(); | ||
| } |
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