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70 lines
1.9 KiB
Dart
70 lines
1.9 KiB
Dart
class ViewRect {
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final double left;
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final double top;
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final double right;
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final double bottom;
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const ViewRect(this.left, this.top, this.right, this.bottom);
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double get width => right - left;
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double get height => bottom - top;
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double get centerX => (left + right) / 2;
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double get centerY => (top + bottom) / 2;
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}
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/// 模型归一化坐标 → 预览视图坐标（含传感器旋转与 FIT_COVER 全屏裁剪）。
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class CoordinateMapper {
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static ViewRect mapToView(
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double normLeft,
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double normTop,
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double normRight,
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double normBottom,
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int rotation,
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int imageW,
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int imageH,
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double viewW,
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double viewH,
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) {
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// 1) 旋转校正：图像方向 → 竖屏视图方向（归一化坐标）
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late final double x0, y0, x1, y1;
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switch (rotation) {
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case 90:
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x0 = 1 - normBottom;
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y0 = normLeft;
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x1 = 1 - normTop;
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y1 = normRight;
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case 180:
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x0 = 1 - normRight;
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y0 = 1 - normBottom;
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x1 = 1 - normLeft;
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y1 = 1 - normTop;
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case 270:
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x0 = normTop;
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y0 = 1 - normRight;
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x1 = normBottom;
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y1 = 1 - normLeft;
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default:
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x0 = normLeft;
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y0 = normTop;
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x1 = normRight;
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y1 = normBottom;
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}
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// 2) 旋转后图像在竖屏方向上的尺寸
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final portrait = rotation == 90 || rotation == 270;
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final portW = portrait ? imageH : imageW;
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final portH = portrait ? imageW : imageH;
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// 3) FIT_COVER 缩放与居中裁剪：放大到铺满视图，溢出部分裁掉
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final scale = viewW / portW < viewH / portH
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? viewH / portH
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: viewW / portW;
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final offsetX = (viewW - portW * scale) / 2;
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final offsetY = (viewH - portH * scale) / 2;
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return ViewRect(
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x0 * portW * scale + offsetX,
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y0 * portH * scale + offsetY,
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x1 * portW * scale + offsetX,
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y1 * portH * scale + offsetY,
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);
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}
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}
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