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make negative dim and contrast work (not really useful)

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Matthias Wirth
2020-04-20 17:50:25 +02:00
parent 218f5331ad
commit 114ba4279d
1 changed files with 9 additions and 0 deletions
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9
html/script.js
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@@ -3008,11 +3008,20 @@ function dim(evt) {
evt.context.globalCompositeOperation = 'multiply';
evt.context.fillStyle = 'rgba(0,0,0,'+dim+')';
evt.context.fillRect(0, 0, evt.context.canvas.width, evt.context.canvas.height);
} else if (dim < -0.0001) {
evt.context.globalCompositeOperation = 'screen';
console.log(evt.context.globalCompositeOperation);
evt.context.fillStyle = 'rgba(255, 255, 255,'+(-dim)+')';
evt.context.fillRect(0, 0, evt.context.canvas.width, evt.context.canvas.height);
}
if (contrast > 0.0001) {
evt.context.globalCompositeOperation = 'overlay';
evt.context.fillStyle = 'rgba(0,0,0,'+contrast+')';
evt.context.fillRect(0, 0, evt.context.canvas.width, evt.context.canvas.height);
} else if (contrast < -0.0001) {
evt.context.globalCompositeOperation = 'overlay';
evt.context.fillStyle = 'rgba(255, 255, 255,'+ (-contrast)+')';
evt.context.fillRect(0, 0, evt.context.canvas.width, evt.context.canvas.height);
}
evt.context.globalCompositeOperation = 'source-over';
}