46 lines
No EOL
1.5 KiB
C#
46 lines
No EOL
1.5 KiB
C#
using UnityEngine;
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namespace cylvester
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{
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interface IRectangularSelection
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{
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void Start(Vector2 mousePosition);
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void Update(Vector2 mousePosition, ref Rect paintSpace, ref Rect selectionRect);
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}
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public class RectangularSelection : IRectangularSelection
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{
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private readonly Rect paintSpace_;
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private Rect selectedArea_;
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private readonly int textureWidth_;
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private readonly int textureHeight_;
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public RectangularSelection(int textureWidth, int textureHeight)
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{
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textureWidth_ = textureWidth;
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textureHeight_ = textureHeight;
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}
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public void Start(Vector2 mousePosition)
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{
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selectedArea_.x = mousePosition.x;
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selectedArea_.y = mousePosition.y;
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}
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public void Update(Vector2 mousePosition, ref Rect paintSpace, ref Rect selectionRect)
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{
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selectedArea_.width = mousePosition.x - selectedArea_.x;
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selectedArea_.height = mousePosition.y - selectedArea_.y;
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var xPos = (selectedArea_.x - paintSpace.x) / paintSpace.width;
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var yPos = (selectedArea_.y - paintSpace.y) / paintSpace.height;
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var width = selectedArea_.width / paintSpace.width;
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var height = selectedArea_.height / paintSpace.height;
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selectionRect.x = xPos * textureWidth_;
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selectionRect.y = yPos * textureHeight_;
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selectionRect.width = width * textureWidth_;
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selectionRect.height = height * textureHeight_;
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}
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}
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} |