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obsidian-excalidraw-plugin/ea-scripts/Lighten background color.md
2022-09-13 10:47:21 +02:00

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/*
![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/scripts-download-raw.jpg)
Download this file and save to your Obsidian Vault including the first line, or open it in "Raw" and copy the entire contents to Obsidian.
![](https://raw.githubusercontent.com/zsviczian/obsidian-excalidraw-plugin/master/images/darken-lighten-background-color.png)
This script lightens the background color of the selected element by 2% at a time.
You can use this script several times until you are satisfied. It is recommended to set a shortcut key for this script so that you can quickly try to DARKEN and LIGHTEN the color effect.
In contrast to the `Modify background color opacity` script, the advantage is that the background color of the element is not affected by the canvas color, and the color value does not appear in a strange rgba() form.
The color conversion method was copied from [color-convert](https://github.com/Qix-/color-convert).
```javascript
*/
if(!ea.verifyMinimumPluginVersion || !ea.verifyMinimumPluginVersion("1.7.19")) {
new Notice("This script requires a newer version of Excalidraw. Please install the latest version.");
return;
}
let settings = ea.getScriptSettings();
//set default values on first run
if(!settings["Step size"]) {
settings = {
"Step size" : {
value: 2,
description: "Step size in percentage for making the color lighter"
}
};
ea.setScriptSettings(settings);
}
const step = settings["Step size"].value;
const elements = ea
.getViewSelectedElements()
.filter((el) =>
["rectangle", "ellipse", "diamond", "image", "line", "freedraw"].includes(el.type)
);
ea.copyViewElementsToEAforEditing(elements);
for (const el of ea.getElements()) {
const color = ea.colorNameToHex(el.backgroundColor);
const cm = ea.getCM(color);
if (cm) {
const lighter = cm.lighterBy(step);
if(Math.ceil(lighter.lightness)<100) el.backgroundColor = lighter.stringHSL();
}
}
await ea.addElementsToView(false, false);