53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
/*
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* @provide pskl.drawingtools.BaseTool
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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.BaseTool = function() {};
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ns.BaseTool.prototype.applyToolAt = function(col, row, frame) {};
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ns.BaseTool.prototype.moveToolAt = function(col, row, frame) {};
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ns.BaseTool.prototype.releaseToolAt = function(col, row, frame) {};
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/**
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* Bresenham line algorihtm: Get an array of pixels from
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* start and end coordinates.
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*
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* http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
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* http://stackoverflow.com/questions/4672279/bresenham-algorithm-in-javascript
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*
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* @private
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*/
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ns.BaseTool.prototype.getLinePixels_ = function(x0, x1, y0, y1) {
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var pixels = [];
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var dx = Math.abs(x1-x0);
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var dy = Math.abs(y1-y0);
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var sx = (x0 < x1) ? 1 : -1;
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var sy = (y0 < y1) ? 1 : -1;
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var err = dx-dy;
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while(true){
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// Do what you need to for this
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pixels.push({"col": x0, "row": y0});
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if ((x0==x1) && (y0==y1)) break;
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var e2 = 2*err;
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if (e2>-dy){
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err -= dy;
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x0 += sx;
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}
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if (e2 < dx) {
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err += dx;
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y0 += sy;
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}
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}
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return pixels;
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};
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})();
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