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Tighten bitmap selection bounds

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This commit is contained in:
adroitwhiz 2020-05-16 03:41:39 -04:00
parent b0164e7783
commit de502d6843
2 changed files with 19 additions and 8 deletions
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19
src/helper/bitmap.js
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@ -320,11 +320,18 @@ const columnBlank_ = function (imageData, width, x, top, bottom) {
return true;
};
// Adapted from Tim Down's https://gist.github.com/timdown/021d9c8f2aabc7092df564996f5afbbf
// Get bounds, trimming transparent pixels from edges.
const getHitBounds = function (raster) {
const width = raster.width;
const imageData = raster.getImageData(raster.bounds);
/**
* Get bounds around the contents of a raster, trimming transparent pixels from edges.
* Adapted from Tim Down's https://gist.github.com/timdown/021d9c8f2aabc7092df564996f5afbbf
* @param {paper.Raster} raster The raster to get the bounds around
* @param {paper.Rectangle} [rect] Optionally, an alternative bounding rectangle to limit the check to.
* @returns {paper.Rectangle} The bounds around the opaque area of the passed raster
* (or opaque within the passed rectangle)
*/
const getHitBounds = function (raster, rect) {
const bounds = rect || raster.bounds;
const width = bounds.width;
const imageData = raster.getImageData(bounds);
let top = 0;
let bottom = imageData.height;
let left = 0;
@ -343,7 +350,7 @@ const getHitBounds = function (raster) {
left = right = imageData.width / 2;
}
return new paper.Rectangle(left, top, right - left, bottom - top);
return new paper.Rectangle(left + bounds.left, top + bounds.top, right - left, bottom - top);
};
const trim_ = function (raster) {

8
src/helper/selection-tools/selection-box-tool.js
View file

@ -3,6 +3,7 @@ import {rectSelect} from '../guides';
import {clearSelection, processRectangularSelection} from '../selection';
import {getRaster} from '../layer';
import {ART_BOARD_WIDTH, ART_BOARD_HEIGHT} from '../view';
import {getHitBounds} from '../../helper/bitmap';
/** Tool to handle drag selection. A dotted line box appears and everything enclosed is selected. */
class SelectionBoxTool {
@ -44,8 +45,8 @@ class SelectionBoxTool {
}
onMouseUpBitmap (event) {
if (event.event.button > 0) return; // only first mouse button
if (this.selectionRect && this.selectionRect.bounds.intersects(getRaster().bounds)) {
const rect = new paper.Rectangle({
if (this.selectionRect) {
let rect = new paper.Rectangle({
from: new paper.Point(
Math.max(0, Math.round(this.selectionRect.bounds.topLeft.x)),
Math.max(0, Math.round(this.selectionRect.bounds.topLeft.y))),
@ -54,6 +55,9 @@ class SelectionBoxTool {
Math.min(ART_BOARD_HEIGHT, Math.round(this.selectionRect.bounds.bottomRight.y)))
});
// Trim/tighten selection bounds inwards to only the opaque region, excluding transparent pixels
rect = getHitBounds(getRaster(), rect);
if (rect.area) {
// Pull selected raster to active layer
const raster = getRaster().getSubRaster(rect);