49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
/*
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* @provide pskl.drawingtools.SimplePen
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*
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* @require pskl.utils
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*/
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(function() {
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var ns = $.namespace("pskl.drawingtools");
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ns.SimplePen = function() {
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this.toolId = "tool-pen";
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this.helpText = "Pen tool";
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this.previousCol = null;
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this.previousRow = null;
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};
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pskl.utils.inherit(ns.SimplePen, ns.BaseTool);
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/**
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* @override
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*/
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ns.SimplePen.prototype.applyToolAt = function(col, row, color, frame, overlay) {
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if (frame.containsPixel(col, row)) {
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frame.setPixel(col, row, color);
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}
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this.previousCol = col;
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this.previousRow = row;
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};
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ns.SimplePen.prototype.moveToolAt = function(col, row, color, frame, overlay) {
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if((Math.abs(col - this.previousCol) > 1) || (Math.abs(row - this.previousRow) > 1)) {
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// The pen movement is too fast for the mousemove frequency, there is a gap between the
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// current point and the previously drawn one.
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// We fill the gap by calculating missing dots (simple linear interpolation) and draw them.
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var interpolatedPixels = this.getLinePixels_(col, this.previousCol, row, this.previousRow);
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for(var i=0, l=interpolatedPixels.length; i<l; i++) {
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var coords = interpolatedPixels[i];
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this.applyToolAt(coords.col, coords.row, color, frame, overlay);
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}
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}
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else {
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this.applyToolAt(col, row, color, frame, overlay);
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}
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this.previousCol = col;
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this.previousRow = row;
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};
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})();
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