import scrawl from '../source/scrawl.js'import scrawl from '../source/scrawl.js'let canvas = scrawl.library.artefact.mycanvas;
canvas.set({
backgroundColor: 'blanchedalmond',
css: {
border: '1px solid black',
overflow: 'hidden',
resize: 'both',
},
fit: 'cover',
checkForResize: true,
});Create the radial gradient
let graddy = scrawl.makeRadialGradient({
name: 'mygradient',
startX: '50%',
startY: '50%',
endX: '50%',
endY: '50%',
endRadius: 300,
});Create a block entity which will use the gradient
scrawl.makeBlock({
name: 'myblock',
width: '90%',
height: '90%',
startX: '5%',
startY: '5%',
fillStyle: graddy,
strokeStyle: 'coral',
lineWidth: 2,
method: 'fillAndDraw',
});Function to display frames-per-second data, and other information relevant to the demo
let report = function () {
let testTicker = Date.now(),
testTime, testNow,
testMessage = document.querySelector('#reportmessage');
return function () {
testNow = Date.now();
testTime = testNow - testTicker;
testTicker = testNow;
testMessage.textContent = `Screen refresh: ${Math.ceil(testTime)}ms; fps: ${Math.floor(1000 / testTime)}
Palette - start: ${graddy.get('paletteStart')}; end: ${graddy.get('paletteEnd')}
Start - x: ${graddy.get('startX')}; y: ${graddy.get('startY')}; radius: ${graddy.get('startRadius')}
End - x: ${graddy.get('endX')}; y: ${graddy.get('endY')}; radius: ${graddy.get('endRadius')}`;
};
}();Create the Display cycle animation
scrawl.makeRender({
name: 'demo-animation',
target: canvas,
afterShow: report,
});scrawl.observeAndUpdate({
event: ['input', 'change'],
origin: '.controlItem',
target: graddy,
useNativeListener: true,
preventDefault: true,
updates: {
paletteStart: ['paletteStart', 'int'],
paletteEnd: ['paletteEnd', 'int'],
startX: ['startX', '%'],
startY: ['startY', '%'],
startRadius: ['startRadius', 'int'],
endX: ['endX', '%'],
endY: ['endY', '%'],
endRadius: ['endRadius', 'int'],
},
});
let events = (e) => {
e.preventDefault();
e.returnValue = false;
let val = parseInt(e.target.value, 10);
switch (e.target.id) {
case 'red':
if (val) graddy.updateColor(350, 'red');
else graddy.removeColor(350);
break;
case 'blue':
if (val) graddy.updateColor(650, 'blue');
else graddy.removeColor(650);
break;
}
};
scrawl.addNativeListener(['input', 'change'], events, '.controlItem');Test to make sure Canvas is listening for external changes in its dimensions
checkForResize flag set to true, enabling the checksdocument.querySelector('#width').addEventListener('input', (e) => {
canvas.domElement.width = `${e.target.value}`;
}, false);
document.querySelector('#height').addEventListener('input', (e) => {
canvas.domElement.height = `${e.target.value}`;
}, false);Set the DOM input values
document.querySelector('#paletteStart').value = 0;
document.querySelector('#paletteEnd').value = 999;
document.querySelector('#startX').value = 50;
document.querySelector('#startY').value = 50;
document.querySelector('#startRadius').value = 0;
document.querySelector('#endX').value = 50;
document.querySelector('#endY').value = 50;
document.querySelector('#endRadius').value = 300;
document.querySelector('#red').value = 0;
document.querySelector('#blue').value = 0;
document.querySelector('#width').value = 600;
document.querySelector('#height').value = 400;console.log(scrawl.library);