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Eye candy for unsolved arcs

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This commit is contained in:
Val Erastov 2015-02-25 01:18:45 -08:00
parent 7c37a0699c
commit f99a788ee7
1 changed files with 14 additions and 3 deletions
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17
web/app/sketcher/shapes/arc.js
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@ -50,14 +50,25 @@ TCAD.TWO.Arc.prototype.drawImpl = function(ctx, scale) {
var r = this.radiusForDrawing();
var startAngle = Math.atan2(this.a.y - this.c.y, this.a.x - this.c.x);
var endAngle;
if (TCAD.utils.areEqual(this.a.x, this.b.x, TCAD.TOLERANCE) &&
if (TCAD.utils.areEqual(this.a.x, this.b.x, TCAD.TOLERANCE) &&
TCAD.utils.areEqual(this.a.y, this.b.y, TCAD.TOLERANCE)) {
endAngle = startAngle + 2 * Math.PI;
} else {
endAngle = Math.atan2(this.b.y - this.c.y, this.b.x - this.c.x);
}
}
ctx.arc(this.c.x, this.c.y, r, startAngle, endAngle);
ctx.stroke();
var distanceB = this.distanceB();
if (Math.abs(r - distanceB) * scale > 1) {
var adj = r / distanceB;
ctx.save();
ctx.setLineDash([7 / scale]);
ctx.lineTo(this.b.x, this.b.y);
ctx.moveTo(this.b.x + (this.b.x - this.c.x) / adj, this.b.y + (this.b.y - this.c.y) / adj);
ctx.stroke();
ctx.restore();
} else {
ctx.stroke();
}
};