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For radar chart background colors, don't recalculate center offset multiple times. Verify that background color count is same as axes count.
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@ -2005,16 +2005,17 @@
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ctx.strokeStyle = this.angleLineColor;
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for (var i = this.valuesCount - 1; i >= 0; i--) {
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if (this.angleLineWidth > 0){
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var outerPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max));
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var centerOffset = this.calculateCenterOffset(this.max);
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var outerPosition = this.getPointPosition(i, centerOffset);
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ctx.beginPath();
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ctx.moveTo(this.xCenter, this.yCenter);
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ctx.lineTo(outerPosition.x, outerPosition.y);
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ctx.stroke();
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ctx.closePath();
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if (this.backgroundColors) {
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var previousOuterPosition = this.getPointPosition(i === 0 ? this.valuesCount - 1 : i - 1, this.calculateCenterOffset(this.max));
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var nextOuterPosition = this.getPointPosition(i === this.valuesCount - 1 ? 0 : i + 1, this.calculateCenterOffset(this.max));
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if (this.backgroundColors && this.backgroundColors.length == this.valuesCount) {
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var previousOuterPosition = this.getPointPosition(i === 0 ? this.valuesCount - 1 : i - 1, centerOffset);
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var nextOuterPosition = this.getPointPosition(i === this.valuesCount - 1 ? 0 : i + 1, centerOffset);
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var previousOuterHalfway = { x: (previousOuterPosition.x + outerPosition.x) / 2, y: (previousOuterPosition.y + outerPosition.y) / 2 };
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var nextOuterHalfway = { x: (outerPosition.x + nextOuterPosition.x) / 2, y: (outerPosition.y + nextOuterPosition.y) / 2 };
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