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65 lines
1.8 KiB
65 lines
1.8 KiB
5 years ago
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using UnityEngine;
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namespace Unity.UIWidgets.ui {
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static class XformUtils {
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public static float getAverageScale(Matrix3 matrix) {
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return (getScaleX(matrix) + getScaleY(matrix)) * 0.5f;
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}
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public static float getMaxScale(Matrix3 matrix) {
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return Mathf.Max(getScaleX(matrix), getScaleY(matrix));
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}
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public static float getScaleX(Matrix3 matrix) {
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// ignore perspective parameters for now.
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if (matrix.isIdentity()) {
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return 1.0f;
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}
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if (matrix.getSkewY() == 0) {
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return matrix.getScaleX();
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}
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var x = matrix.getScaleX();
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var y = matrix.getSkewY();
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return Mathf.Sqrt(x * x + y * y);
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}
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public static float getScaleY(Matrix3 matrix) {
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// ignore perspective parameters for now.
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if (matrix.isIdentity()) {
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return 1.0f;
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}
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if (matrix.getSkewX() == 0) {
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return matrix.getScaleY();
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}
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var x = matrix.getSkewX();
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var y = matrix.getScaleY();
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return Mathf.Sqrt(x * x + y * y);
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}
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public static float getScale(Matrix3 matrix) {
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var scaleX = getScaleX(matrix);
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var scaleY = getScaleY(matrix);
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if (scaleX == 1.0) {
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return scaleY;
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}
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if (scaleY == 1.0) {
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return scaleX;
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}
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// geometric mean of len0 and len1.
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return Mathf.Sqrt(scaleX * scaleY);
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}
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public static float mapRadius(Matrix3 matrix, float radius) {
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return getScale(matrix) * radius;
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}
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}
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}
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