pixel-editor/js/tools/SelectionTool.js

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class SelectionTool extends Tool {
switchFunc = undefined;
moveTool = undefined;
boundingBox = {minX: 9999999, maxX: -1, minY: 9999999, maxY: -1};
currSelection = {};
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outlineData = undefined;
previewData = undefined;
selectedPixel = undefined;
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moveOffset = [0, 0];
boundingBoxCenter = [0,0];
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reconstruct = {left:false, right:false, top:false, bottom:false};
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constructor(name, options, switchFunc, moveTool) {
super(name, options);
this.moveTool = moveTool;
this.switchFunc = switchFunc;
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}
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onStart(mousePos, mouseTarget) {
super.onStart(mousePos);
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if (mouseTarget == undefined || Util.isChildOfByClass(mouseTarget, "editor-top-menu") ||
!Util.cursorInCanvas(currFile.canvasSize, [mousePos[0]/currFile.zoom, mousePos[1]/currFile.zoom]))
return;
// Putting the vfx layer on top of everything
currFile.VFXLayer.canvas.style.zIndex = MAX_Z_INDEX;
currFile.VFXLayer.context.fillStyle = "rgba(0,0,0,1)";
this.startMousePos = [Math.floor(mousePos[0] / currFile.zoom),
Math.floor(mousePos[1] / currFile.zoom)];
this.endMousePos = [this.startMousePos[0], this.startMousePos[1]];
let mouseX = mousePos[0] / currFile.zoom;
let mouseY = mousePos[1] / currFile.zoom;
this.boundingBox = {minX: 9999999, maxX: -1, minY: 9999999, maxY: -1};
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this.reconstruct = {left:false, right:false, top:false, bottom:false};
this.currSelection = {};
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this.moveOffset = [0, 0];
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this.updateBoundingBox(Math.min(Math.max(mouseX, 0), currFile.canvasSize[0]-1),
Math.min(Math.max(mouseY, 0), currFile.canvasSize[1]-1));
}
onDrag(mousePos) {
super.onDrag(mousePos);
let mouseX = mousePos[0] / currFile.zoom;
let mouseY = mousePos[1] / currFile.zoom;
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if (mouseX > currFile.canvasSize[0])
this.reconstruct.right = true;
else if (mouseX < 0)
this.reconstruct.left = true;
if (mouseY > currFile.canvasSize[1])
this.reconstruct.bottom = true;
else if (mouseY < 0)
this.reconstruct.top = true;
if (Util.cursorInCanvas(currFile.canvasSize, [mousePos[0]/currFile.zoom, mousePos[1]/currFile.zoom])) {
this.updateBoundingBox(Math.min(Math.max(mouseX, 0), currFile.canvasSize[0]-1),
Math.min(Math.max(mouseY, 0), currFile.canvasSize[1]-1));
}
}
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onEnd(mousePos, mouseTarget) {
super.onEnd(mousePos);
if (mouseTarget == undefined || Util.isChildOfByClass(mouseTarget, "editor-top-menu"))
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return;
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let mouseX = mousePos[0] / currFile.zoom;
let mouseY = mousePos[1] / currFile.zoom;
if (Util.cursorInCanvas(currFile.canvasSize, [mousePos[0]/currFile.zoom, mousePos[1]/currFile.zoom])) {
this.updateBoundingBox(Math.min(Math.max(mouseX, 0), currFile.canvasSize[0]-1),
Math.min(Math.max(mouseY, 0), currFile.canvasSize[1]-1));
}
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this.boundingBoxCenter = [this.boundingBox.minX + (this.boundingBox.maxX - this.boundingBox.minX) / 2,
this.boundingBox.minY + (this.boundingBox.maxY - this.boundingBox.minY) / 2];
}
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cutSelection() {
let currLayerData = currFile.currentLayer.context.getImageData(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]).data;
// Save the selected pixels so that they can be moved and pasted back in the right place
for (const key in this.currSelection) {
let x = parseInt(key.split(",")[0]);
let y = parseInt(key.split(",")[1]);
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let index = (y * currFile.canvasSize[0] + x) * 4;
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for (let i=0; i<4; i++) {
// Save the pixel
this.previewData.data[index + i] = currLayerData[index + i];
// Delete the data below
currLayerData[index + i] = 0;
}
}
currFile.currentLayer.context.putImageData(new ImageData(currLayerData, currFile.canvasSize[0]), 0, 0);
}
pasteSelection(){
if (this.currSelection == undefined)
return;
// I have to save the underlying data, so that the transparent pixels in the clipboard
// don't override the coloured pixels in the canvas
let underlyingImageData = currFile.currentLayer.context.getImageData(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]);
let pasteData = currFile.TMPLayer.context.getImageData(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]);
// Clearing the tmp (move preview) and vfx (ants) layers
currFile.TMPLayer.context.clearRect(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]);
currFile.VFXLayer.context.clearRect(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]);
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Util.pasteData(underlyingImageData, pasteData, currFile.currentLayer.context);
currFile.currentLayer.updateLayerPreview();
currFile.VFXLayer.canvas.style.zIndex = MIN_Z_INDEX;
}
cursorInSelectedArea(mousePos) {
let floored = [Math.floor(mousePos[0] / currFile.zoom) - this.moveOffset[0],
Math.floor(mousePos[1] / currFile.zoom) - this.moveOffset[1]];
if (this.currSelection[floored] != undefined)
return true;
return false;
}
visit(pixel, visited, data) {
let toVisit = [pixel];
let selected = [];
let currVisited = {};
currFile.TMPLayer.context.clearRect(0, 0, 512, 512);
while (toVisit.length > 0) {
pixel = toVisit.pop();
selected.push(pixel);
visited[pixel] = true;
currVisited[pixel] = true;
let col = Util.getPixelColor(data, pixel[0], pixel[1], currFile.canvasSize[0]);
if (col[3] == 255)
continue;
if (this.isBorderOfBox(pixel))
return [];
let top, bottom, left, right;
if (pixel[1] > 0)
top = [pixel[0], pixel[1] - 1];
else
top = undefined;
if (pixel[0] > 0)
left = [pixel[0] - 1, pixel[1]];
else
left = undefined;
if (pixel[1] < currFile.canvasSize[1])
bottom = [pixel[0], pixel[1] + 1];
else
bottom = undefined;
if (pixel[0] < currFile.canvasSize[0])
right = [pixel[0] + 1, pixel[1]];
else
right = undefined;
if (right != undefined && currVisited[right] == undefined)
toVisit.push(right);
if (left != undefined && currVisited[left] == undefined)
toVisit.push(left);
if (top != undefined && currVisited[top] == undefined)
toVisit.push(top);
if (bottom != undefined && currVisited[bottom] == undefined)
toVisit.push(bottom);
}
return selected;
}
getSelection() {
let selected = [];
let visited = {};
let data = currFile.VFXLayer.context.getImageData(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]).data;
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// BFS: a pixel that causes the algorithm to visit a pixel of the bounding box is outside the
// selection. Otherwise, since the algorithm stops visiting when it reaches the outline,
// the pixel is inside the selection (and so are all the ones that have been visited)
for (let x=this.boundingBox.minX-1; x<=this.boundingBox.maxX+1; x++) {
for (let y=this.boundingBox.minY-1; y<=this.boundingBox.maxY+1; y++) {
if (visited[[x, y]] == undefined) {
let insidePixels = this.visit([x,y], visited, data);
for (let i=0; i<insidePixels.length; i++) {
selected.push(insidePixels[i]);
this.currSelection[insidePixels[i]] = true;
}
}
}
}
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// Save the selection outline
this.outlineData = currFile.VFXLayer.context.getImageData(this.boundingBox.minX,
this.boundingBox.minY, this.boundingBox.maxX - this.boundingBox.minX,
this.boundingBox.maxY - this.boundingBox.minY);
// Create the image data containing the selected pixels
this.previewData = new ImageData(currFile.canvasSize[0], currFile.canvasSize[1]);
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// Cut the selection
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this.cutSelection();
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// Put it on the TMP layer
currFile.TMPLayer.context.putImageData(this.previewData, 0, 0);
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// Draw the selected area and the bounding box
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this.drawSelectedArea();
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this.drawBoundingBox();
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return this.previewData;
}
drawSelectedArea() {
for (const key in this.currSelection) {
let x = parseInt(key.split(",")[0]);
let y = parseInt(key.split(",")[1]);
currFile.VFXLayer.context.fillStyle = "rgba(10, 0, 40, 0.3)";
currFile.VFXLayer.context.fillRect(x + this.moveOffset[0], y + this.moveOffset[1], 1, 1);
}
}
drawOutline() {
currFile.VFXLayer.context.clearRect(0, 0, currFile.canvasSize[0], currFile.canvasSize[1]);
currFile.VFXLayer.context.putImageData(this.outlineData, this.boundingBox.minX + this.moveOffset[0],
this.boundingBox.minY + this.moveOffset[1]);
}
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drawBoundingBox() {
currFile.VFXLayer.context.fillStyle = "red";
currFile.VFXLayer.context.fillRect(this.boundingBox.minX + this.moveOffset[0],
this.boundingBox.minY + this.moveOffset[1], 1, 1);
currFile.VFXLayer.context.fillRect(this.boundingBox.minX+ this.moveOffset[0],
this.boundingBox.maxY + this.moveOffset[1], 1, 1);
currFile.VFXLayer.context.fillRect(this.boundingBox.maxX+ this.moveOffset[0],
this.boundingBox.minY + this.moveOffset[1], 1, 1);
currFile.VFXLayer.context.fillRect(this.boundingBox.maxX+ this.moveOffset[0],
this.boundingBox.maxY + this.moveOffset[1], 1, 1);
}
isBorderOfBox(pixel) {
return pixel[0] == this.boundingBox.minX || pixel[0] == this.boundingBox.maxX ||
pixel[1] == this.boundingBox.minY || pixel[1] == this.boundingBox.maxY;
}
updateBoundingBox(mouseX, mouseY) {
if (mouseX > this.boundingBox.maxX)
this.boundingBox.maxX = Math.floor(mouseX);
if (mouseX < this.boundingBox.minX)
this.boundingBox.minX = Math.floor(mouseX);
if (mouseY < this.boundingBox.minY)
this.boundingBox.minY = Math.floor(mouseY);
if (mouseY > this.boundingBox.maxY)
this.boundingBox.maxY = Math.floor(mouseY);
}
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}