38 lines
723 B
JavaScript
38 lines
723 B
JavaScript
// vim: set ts=2 sw=2 et tw=80:
|
|
|
|
const history = {
|
|
paths: []
|
|
}
|
|
|
|
history.pop = () => {
|
|
if (history.paths.length == 0) return;
|
|
return history.paths.pop();
|
|
};
|
|
|
|
history.initializeNewPath = () => {
|
|
history.paths.push([]);
|
|
};
|
|
|
|
history.push = (stroke) => {
|
|
if (!stroke || !stroke instanceof Stroke) {
|
|
throw new Error(JSON.stringify(stroke) + ' is not a Stroke instance');
|
|
}
|
|
history.paths[history.paths.length - 1].push(stroke);
|
|
return history.paths[history.paths.length - 1];
|
|
}
|
|
|
|
history.clear = () => {
|
|
history.paths = [];
|
|
};
|
|
|
|
|
|
|
|
class Stroke {
|
|
constructor(brushName, strokeStyle, x, y) {
|
|
this.brushName = brushName;
|
|
this.strokeStyle = strokeStyle;
|
|
this.offsetX = x;
|
|
this.offsetY = y;
|
|
}
|
|
}
|