51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
function Connection(config){
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var self = this;
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// Properties
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self.from = config.from;
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self.to = config.to;
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self.uncuttable = config.uncuttable || false;
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self.sim = config.sim;
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// Update
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self.update = function(){};
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// Draw
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self.draw = function(ctx){
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ctx.strokeStyle = "#444";
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ctx.lineWidth = self.uncuttable ? 6 : 3; // thick=uncuttable
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ctx.beginPath();
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ctx.moveTo(self.from.x, self.from.y);
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ctx.lineTo(self.to.x, self.to.y);
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ctx.stroke();
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};
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// Hit Test with a LINE SEGMENT
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// code adapted from https://gist.github.com/Joncom/e8e8d18ebe7fe55c3894
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self.hitTest = function(line){
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var p0_x, p0_y, p1_x, p1_y, p2_x, p2_y, p3_x, p3_y;
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p0_x = line[0];
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p0_y = line[1];
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p1_x = line[2];
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p1_y = line[3];
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p2_x = self.from.x;
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p2_y = self.from.y;
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p3_x = self.to.x;
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p3_y = self.to.y;
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var s1_x, s1_y, s2_x, s2_y;
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s1_x = p1_x - p0_x;
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s1_y = p1_y - p0_y;
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s2_x = p3_x - p2_x;
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s2_y = p3_y - p2_y;
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var s, t;
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s = (-s1_y * (p0_x - p2_x) + s1_x * (p0_y - p2_y)) / (-s2_x * s1_y + s1_x * s2_y);
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t = ( s2_x * (p0_y - p2_y) - s2_y * (p0_x - p2_x)) / (-s2_x * s1_y + s1_x * s2_y);
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return (s >= 0 && s <= 1 && t >= 0 && t <= 1);
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};
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} |