pixel-editor/js/_move.js

var imageDataToMove;
var canMoveSelection = false;

// TODO: move with arrows
function updateMovePreview(mouseEvent) {
	lastMousePos = getCursorPosition(mouseEvent);
	// clear the entire tmp layer
	TMPLayer.context.clearRect(0, 0, TMPLayer.canvas.width, TMPLayer.canvas.height);
	// put the image data with offset
	TMPLayer.context.putImageData(
		imageDataToMove, 
		Math.round(lastMousePos[0] / zoom - imageDataToMove.width / 2), 
		Math.round(lastMousePos[1] / zoom - imageDataToMove.height / 2));

	moveSelection(lastMousePos[0] / zoom, lastMousePos[1] / zoom, imageDataToMove.width, imageDataToMove.height) 
}

function endSelection() {
	TMPLayer.context.clearRect(0, 0, TMPLayer.canvas.width, TMPLayer.canvas.height);
	VFXLayer.context.clearRect(0, 0, VFXLayer.canvas.width, VFXLayer.canvas.height);

	currentLayer.context.putImageData(
		imageDataToMove, 
		Math.round(lastMousePos[0] / zoom - imageDataToMove.width / 2), 
		Math.round(lastMousePos[1] / zoom - imageDataToMove.height / 2));
}