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path: root/compiler/saturate.nim
Commit message (Expand)AuthorAgeFilesLines
* compiler: Trim .nim files trailing whitespaceAdam Strzelecki2015-09-041-1/+1
* Nimrod renamed to NimAraq2014-08-281-1/+1
* case consistency part 4Araq2013-12-271-6/+6
* changed integer promotion rules; breaks bootstrapping and lots of codeAraq2012-07-081-0/+79
3' href='#n63'>63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('./sw.js')
    .then(function(registration) {
        console.log('Service Worker registered with scope:', registration.scope);
    })
    .catch(function(err) {
        console.error('Service Worker registration failed:', err);
    });
}

document.getElementById('noteArea').focus(); // ensures that textarea is focused when the page loads

const canvas = document.getElementById('drawingArea');
const ctx = canvas.getContext('2d');

const noteArea = document.getElementById('noteArea');
noteArea.value = localStorage.getItem('noteContent') || '';

noteArea.style.width = '100vw';
noteArea.style.height = '100vh';
noteArea.style.boxSizing = 'border-box';
noteArea.style.position = 'absolute';
noteArea.style.backgroundColor = 'rgba(255, 255, 255, 0.75)';
noteArea.style.zIndex = '1';

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
canvas.style.position = 'absolute';
canvas.style.zIndex = '0';

let drawing = false;
let prevX = 0;
let prevY = 0;

canvas.style.pointerEvents = 'none';

const getCursorPosition = (e) => {
    const rect = canvas.getBoundingClientRect();
    return {
        x: e.clientX - rect.left,
        y: e.clientY - rect.top
    };
};

const startDrawing = (e) => {
    drawing = true;
    const { x, y } = getCursorPosition(e);
    prevX = x;
    prevY = y;
};

const drawLine = (x1, y1, x2, y2) => {
    ctx.beginPath();
    ctx.lineWidth = 5;
    ctx.lineCap = 'round';
    ctx.strokeStyle = '#000';
    ctx.moveTo(x1, y1);
    ctx.lineTo(x2, y2);
    ctx.stroke();
};

const draw = (e) => {
    if (drawing) {
        const { x, y } = getCursorPosition(e);
        drawLine(prevX, prevY, x, y);
        prevX = x;
        prevY = y;
    }
};

const saveCanvasImage = () => {
    const dataUrl = canvas.toDataURL();
    localStorage.setItem('canvasImage', dataUrl);
};

const handleMouseDown = (e) => {
    startDrawing(e);
};

const handleMouseMove = (e) => {
    if (drawing) {
        draw(e);
    }
};

const handleMouseUp = (e) => {
    if (drawing) {
        draw(e);
        drawing = false;
        saveCanvasImage();
    }
};

const handleTouchStart = (e) => {
    e.preventDefault();
    startDrawing(e.touches[0]);
};

const handleTouchMove = (e) => {
    e.preventDefault();
    if (drawing) {
        draw(e.touches[0]);
    }
};

const handleTouchEnd = (e) => {
    e.preventDefault();
    saveCanvasImage();
};

canvas.addEventListener('mousedown', handleMouseDown);
canvas.addEventListener('mousemove', handleMouseMove);
canvas.addEventListener('mouseup', handleMouseUp);

canvas.addEventListener('touchstart', handleTouchStart, false);
canvas.addEventListener('touchmove', handleTouchMove, false);
canvas.addEventListener('touchend', handleTouchEnd, false);

const savedImage = localStorage.getItem('canvasImage');
if (savedImage) {
    const img = new Image();
    img.onload = () => {
        ctx.drawImage(img, 0, 0);
    };
    img.src = savedImage;
}

const saveCanvasAsImage = () => {
    const confirmDownload = confirm('Do you really want to save the canvas as an image?');
    if (confirmDownload) {
        const dataUrl = canvas.toDataURL();
        const a = document.createElement('a');
        a.href = dataUrl;
        a.download = 'canvas.png';
        a.click();
    }
}

const clearCanvas = () => {
    const confirmClear = confirm('Do you really want to clear the canvas?');
    if (confirmClear) {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        localStorage.removeItem('canvasImage');
    }
}

// Toggle between drawing and note mode
const toggle = () => {
    if (canvas.style.pointerEvents === 'none') {
        // Drawing mode
        canvas.style.pointerEvents = 'auto';
        noteArea.style.pointerEvents = 'none';
        noteArea.style.backgroundColor = 'rgba(255, 255, 255, 0.25)';
        noteArea.style.color = '#bbb';
        canvas.style.cursor = 'crosshair';
        canvas.focus();
        noteArea.blur();
    } else {
        // Note mode
        canvas.style.pointerEvents = 'none';
        noteArea.style.pointerEvents = 'auto';
        noteArea.style.backgroundColor = 'rgba(255, 255, 255, 0.75)';
        noteArea.style.color = 'black';
        canvas.blur();
        noteArea.focus();
    }
    localStorage.setItem('noteContents', noteArea.value);
    localStorage.setItem('noteContent', noteArea.value);
    document.getElementById('mode').innerHTML = canvas.style.pointerEvents === 'none' ? 'typing' : 'drawing';
};

const toggleButton = document.getElementById('toggle');
toggleButton.addEventListener('click', toggle);

const helpText = "This is a modal note taking tool. With it, you can type text that'll be saved to the browser, and you can draw pictures that'll also be saved to the browser. You are in typing mode right now. To toggle between modes tap either cmd + d, ctrl + d or cmd + 1, or ctrl + 1. When in drawing mode, tap c to clear the canvas, tap s to save the contents of the canvas to a png."

const handleSelectChange = () => {
    if (selectElement.value === 'clear') {
        clearCanvas();
    } else if (selectElement.value === 'save') {
        saveCanvasAsImage();
    } else if (selectElement.value === 'help') {
        alert(helpText);
    }

    // Reset select element to default option
    selectElement.selectedIndex = 0;
};

const selectElement = document.getElementById('menu');
selectElement.addEventListener('change', handleSelectChange);

const handleKeyDown = (e) => {
    // Cmd or Ctrl and D/Cmd or Ctrl and 1 to toggle modes
    if (((e.metaKey || e.ctrlKey) && e.key === 'd') || ((e.metaKey || e.ctrlKey) && e.key === '1')) {
        e.preventDefault();
        toggle();
    }

    // C key to clear the canvas
    if (e.key === 'c' && canvas.style.pointerEvents === 'auto') {
        clearCanvas();
    }

    // S key to save the canvas as an image
    if (e.key === 's' && canvas.style.pointerEvents === 'auto') {
        saveCanvasAsImage();
    }

    localStorage.setItem('noteContent', noteArea.value);
};

document.addEventListener('keydown', handleKeyDown);