Added Eraser
This commit is contained in:
brausjonas
+71
-23
@@ -10,14 +10,15 @@ let downLink
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let lastPositions = []
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let strokeWidth = 5
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let lastMouse = 0
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let eraserColor = "rgb(255, 255, 255)"
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let lastStrokeWidthPencil = 5, lastStrokeWidthEraser = 5
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export default function App() {
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useLayoutEffect(() => {
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canvas = document.getElementById("canvas")
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context = canvas.getContext("2d")
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context.fillStyle = "rgb(255, 255, 255)"
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context.fillRect(0, 0, window.innerWidth, window.innerHeight)
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clearScreen("rgb(255, 255, 255)")
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downLink = document.createElement("a")
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downLink.className = "no-display"
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@@ -49,6 +50,7 @@ export default function App() {
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const [strokeWidthSliderValue, setStrokeWidthSliderValue] = useState(strokeWidth)
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const [colorValue, setColorValue] = useState("#000000")
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const [menuBarShown, setMenuBarShown] = useState(true)
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const [selectedTool, setSelectedTool] = useState("pencil")
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class Position {
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constructor(x, y) {
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@@ -57,6 +59,24 @@ export default function App() {
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}
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}
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function clearScreen(color) {
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context.fillStyle = color
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context.fillRect(0, 0, window.innerWidth, window.innerHeight)
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eraserColor = color
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}
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function handleMouseDownCanvas(e)
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{
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mouseDownCanvas = true
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context.fillStyle = selectedTool === "pencil" ? colorValue : eraserColor
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context.beginPath()
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context.arc(e.pageX, e.pageY, strokeWidthSliderValue, 0, 2 * Math.PI, false)
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context.fill()
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lastMouse = Date.now()
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lastPositions.push(new Position(e.pageX, e.pageY))
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}
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function handleMouseMove(event) {
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let mouseX = event.pageX
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let mouseY = event.pageY
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@@ -66,7 +86,7 @@ export default function App() {
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setMenuBarLeft(mouseX - mouseMenuBarOffsetX)
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setMenuBarTop(mouseY - mouseMenuBarOffsetY)
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} else if (mouseDownCanvas) {
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context.fillStyle = colorValue
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context.fillStyle = selectedTool === "pencil" ? colorValue : eraserColor
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lastPositions.push(new Position(mouseX, mouseY))
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@@ -83,6 +103,19 @@ export default function App() {
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downLink.click()
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}
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function handleToolChange(e)
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{
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setSelectedTool(e.target.value)
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if(e.target.value === "pencil") {
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setStrokeWidthSliderValue(lastStrokeWidthPencil)
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strokeWidth = lastStrokeWidthPencil
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}
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else if(e.target.value === "eraser") {
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setStrokeWidthSliderValue(lastStrokeWidthEraser)
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strokeWidth = lastStrokeWidthEraser
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}
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}
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return (
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<div onMouseMove={e => handleMouseMove(e)} style={{overflow: "unset"}}>
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@@ -90,14 +123,7 @@ export default function App() {
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width={window.innerWidth}
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height={window.innerHeight}
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onMouseDown={e => {
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mouseDownCanvas = true
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context.fillStyle = colorValue
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context.beginPath()
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context.arc(e.pageX, e.pageY, strokeWidthSliderValue, 0, 2 * Math.PI, false)
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context.fill()
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lastMouse = Date.now()
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lastPositions.push(new Position(e.pageX, e.pageY))
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handleMouseDownCanvas(e)
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}}
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onMouseUp={e => {
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mouseDownCanvas = false
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@@ -157,30 +183,53 @@ export default function App() {
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<div style={{
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display: "flex",
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flexDirection: "column",
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justifyContent: "flex-start",
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justifyContent: "center",
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gap: 5,
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alignItems: "center",
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pointerEvents: "none"
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}}>
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<div style={{
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display: "flex",
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flexDirection: "row",
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justifyContent: "center",
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alignItems: "center",
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gap: 10
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}}>
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor"
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className="bi bi-pencil-fill" viewBox="0 0 16 16">
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<path
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d="M12.854.146a.5.5 0 0 0-.707 0L10.5 1.793 14.207 5.5l1.647-1.646a.5.5 0 0 0 0-.708l-3-3zm.646 6.061L9.793 2.5 3.293 9H3.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.207l6.5-6.5zm-7.468 7.468A.5.5 0 0 1 6 13.5V13h-.5a.5.5 0 0 1-.5-.5V12h-.5a.5.5 0 0 1-.5-.5V11h-.5a.5.5 0 0 1-.5-.5V10h-.5a.499.499 0 0 1-.175-.032l-.179.178a.5.5 0 0 0-.11.168l-2 5a.5.5 0 0 0 .65.65l5-2a.5.5 0 0 0 .168-.11l.178-.178z"/>
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</svg>
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<p style={{userSelect: "none"}}>{strokeWidthSliderValue}</p>
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<div style={{display: "flex", flexDirection: "column", alignItems: "center", justifyContent: "flex-end", gap: 10}}>
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor"
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className="bi bi-pencil-fill" viewBox="0 0 16 16">
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<path
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d="M12.854.146a.5.5 0 0 0-.707 0L10.5 1.793 14.207 5.5l1.647-1.646a.5.5 0 0 0 0-.708l-3-3zm.646 6.061L9.793 2.5 3.293 9H3.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.207l6.5-6.5zm-7.468 7.468A.5.5 0 0 1 6 13.5V13h-.5a.5.5 0 0 1-.5-.5V12h-.5a.5.5 0 0 1-.5-.5V11h-.5a.5.5 0 0 1-.5-.5V10h-.5a.499.499 0 0 1-.175-.032l-.179.178a.5.5 0 0 0-.11.168l-2 5a.5.5 0 0 0 .65.65l5-2a.5.5 0 0 0 .168-.11l.178-.178z"/>
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</svg>
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<input type={"radio"} name={"tool"} value={"pencil"} style={{width: 20, height: 20, pointerEvents: "auto"}}
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checked={selectedTool === "pencil"} onChange={e => {
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handleToolChange(e)
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}}/>
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</div>
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<div style={{display: "flex", flexDirection: "column", alignItems: "center", justifyContent: "flex-end", gap: 10}}>
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor"
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className="bi bi-eraser-fill" viewBox="0 0 16 16">
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<path
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d="M8.086 2.207a2 2 0 0 1 2.828 0l3.879 3.879a2 2 0 0 1 0 2.828l-5.5 5.5A2 2 0 0 1 7.879 15H5.12a2 2 0 0 1-1.414-.586l-2.5-2.5a2 2 0 0 1 0-2.828l6.879-6.879zm.66 11.34L3.453 8.254 1.914 9.793a1 1 0 0 0 0 1.414l2.5 2.5a1 1 0 0 0 .707.293H7.88a1 1 0 0 0 .707-.293l.16-.16z"/>
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</svg>
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<input type={"radio"} value={"eraser"} name={"tool"} style={{width: 20, height: 20, pointerEvents: "auto"}}
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checked={selectedTool === "eraser"} onChange={e => {
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handleToolChange(e)
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}}/>
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</div>
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</div>
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<input type={"range"} min={1} max={20} value={strokeWidthSliderValue} onChange={e => {
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setStrokeWidthSliderValue(e.currentTarget.value)
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strokeWidth = e.currentTarget.value
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if(selectedTool === "pencil") {
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lastStrokeWidthPencil = strokeWidth
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}
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else if(selectedTool === "eraser") {
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lastStrokeWidthEraser = strokeWidth;
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}
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}} style={{pointerEvents: "auto"}}/>
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<p style={{userSelect: "none"}}>{strokeWidthSliderValue}</p>
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</div>
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{/*Color Selector*/}
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@@ -206,8 +255,7 @@ export default function App() {
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borderRadius: 15,
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pointerEvents: "auto"
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}} onClick={() => {
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context.fillStyle = colorValue
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context.fillRect(0, 0, window.innerWidth, window.innerHeight)
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clearScreen(colorValue)
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}}>
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Clear
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</button>
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