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81 lines
3.0 KiB
JavaScript
81 lines
3.0 KiB
JavaScript
/**
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* @provide pskl.drawingtools.Stroke
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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.Stroke = function() {
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this.toolId = "tool-stroke";
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this.helpText = "Stroke tool";
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// Stroke'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.Stroke, ns.BaseTool);
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/**
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* @override
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*/
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ns.Stroke.prototype.applyToolAt = function(col, row, color, frame, overlay, event) {
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this.startCol = col;
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this.startRow = row;
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// When drawing a stroke we don't change the model instantly, since the
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// user can move his cursor to change the stroke direction and length
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// dynamically. Instead we draw the (preview) stroke in a fake canvas that
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// overlay the drawing canvas.
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// We wait for the releaseToolAt callback to impact both the
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// frame model and canvas rendering.
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// The fake canvas where we will draw the preview of the stroke:
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// Drawing the first point of the stroke in the fake overlay canvas:
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overlay.setPixel(col, row, color);
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};
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ns.Stroke.prototype.moveToolAt = function(col, row, color, frame, overlay, event) {
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overlay.clear();
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// When the user moussemove (before releasing), we dynamically compute the
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// pixel to draw the line and draw this line in the overlay canvas:
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var strokePoints = this.getLinePixels_(this.startCol, col, this.startRow, row);
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// Drawing current stroke:
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for(var i = 0; i< strokePoints.length; i++) {
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if(color == Constants.TRANSPARENT_COLOR) {
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// When mousemoving the stroke tool, we draw in the canvas overlay above the drawing canvas.
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// If the stroke color is transparent, we won't be
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// able to see it during the movement.
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// We set it to a semi-opaque white during the tool mousemove allowing to see colors below the stroke.
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// When the stroke tool will be released, It will draw a transparent stroke,
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// eg deleting the equivalent of a stroke.
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color = Constants.SELECTION_TRANSPARENT_COLOR;
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}
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overlay.setPixel(strokePoints[i].col, strokePoints[i].row, color);
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}
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};
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/**
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* @override
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*/
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ns.Stroke.prototype.releaseToolAt = function(col, row, color, frame, overlay, event) {
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// If the stroke tool is released outside of the canvas, we cancel the stroke:
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// TODO: Mutualize this check in common method
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if(frame.containsPixel(col, row)) {
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// The user released the tool to draw a line. We will compute the pixel coordinate, impact
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// the model and draw them in the drawing canvas (not the fake overlay anymore)
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var strokePoints = this.getLinePixels_(this.startCol, col, this.startRow, row);
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for(var i = 0; i< strokePoints.length; i++) {
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// Change model:
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frame.setPixel(strokePoints[i].col, strokePoints[i].row, color);
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}
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}
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// For now, we are done with the stroke tool and don't need an overlay anymore:
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overlay.clear();
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};
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})();
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