85 lines
2.3 KiB
JavaScript
85 lines
2.3 KiB
JavaScript
/*
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* @provide pskl.drawingtools.Circle
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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.Circle = function() {
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this.toolId = "tool-circle";
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this.helpText = "Circle tool";
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// Circle's first point coordinates (set in applyToolAt)
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this.startCol = null;
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this.startRow = null;
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};
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pskl.utils.inherit(ns.Circle, ns.BaseTool);
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/**
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* @override
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*/
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ns.Circle.prototype.applyToolAt = function(col, row, color, frame, overlay) {
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this.startCol = col;
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this.startRow = row;
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// Drawing the first point of the rectangle in the fake overlay canvas:
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overlay.setPixel(col, row, color);
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};
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ns.Circle.prototype.moveToolAt = function(col, row, color, frame, overlay) {
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overlay.clear();
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if(color == Constants.TRANSPARENT_COLOR) {
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color = Constants.SELECTION_TRANSPARENT_COLOR;
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}
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// draw in overlay
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this.drawCircle_(col, row, color, overlay);
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};
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/**
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* @override
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*/
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ns.Circle.prototype.releaseToolAt = function(col, row, color, frame, overlay) {
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overlay.clear();
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if(frame.containsPixel(col, row)) { // cancel if outside of canvas
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// draw in frame to finalize
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this.drawCircle_(col, row, color, frame);
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}
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};
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ns.Circle.prototype.drawCircle_ = function (col, row, color, targetFrame) {
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var circlePoints = this.getCirclePixels_(this.startCol, this.startRow, col, row);
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for(var i = 0; i< circlePoints.length; i++) {
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// Change model:
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targetFrame.setPixel(circlePoints[i].col, circlePoints[i].row, color);
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}
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};
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ns.Circle.prototype.getCirclePixels_ = function (x0, y0, x1, y1) {
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var coords = pskl.PixelUtils.getOrderedRectangleCoordinates(x0, y0, x1, y1);
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var xC = (coords.x0 + coords.x1)/2;
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var yC = (coords.y0 + coords.y1)/2;
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var rX = coords.x1 - xC;
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var rY = coords.y1 - yC;
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var pixels = [];
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var x, y, angle;
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for (x = coords.x0 ; x < coords.x1 ; x++) {
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angle = Math.acos((x - xC)/rX);
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y = Math.round(rY * Math.sin(angle) + yC);
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pixels.push({"col": x, "row": y});
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pixels.push({"col": 2*xC - x, "row": 2*yC - y});
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}
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for (y = coords.y0 ; y < coords.y1 ; y++) {
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angle = Math.asin((y - yC)/rY);
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x = Math.round(rX * Math.cos(angle) + xC);
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pixels.push({"col": x, "row": y});
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pixels.push({"col": 2*xC - x, "row": 2*yC - y});
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}
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return pixels;
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};
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})();
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