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Add worldToDisplayCoordinates method

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This commit is contained in:
schmelczerandras 2020-10-18 15:42:38 +02:00
commit 184d1a1e39
1 changed files with 37 additions and 7 deletions
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19
src/graphics/rendering/uniforms-provider.ts
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@ -71,21 +71,28 @@ export class UniformsProvider {
}
public screenToWorldPosition(screenPosition: vec2): vec2 {
const transform = this.calculateScreenToWorldTransformation();
return vec2.transformMat2d(vec2.create(), screenPosition, transform);
}
public worldToDisplayCoordinates(worldCoordinates: vec2): vec2 {
const transform = this.calculateScreenToWorldTransformation();
mat2d.invert(transform, transform);
return vec2.transformMat2d(vec2.create(), worldCoordinates, transform);
}
private calculateScreenToWorldTransformation(): mat2d {
const { width, height } = (this.gl
.canvas as HTMLCanvasElement).getBoundingClientRect();
const position = vec2.fromValues(screenPosition.x, height - screenPosition.y);
const resolution = vec2.fromValues(width, height);
const transform = mat2d.fromTranslation(mat2d.create(), this.viewAreaBottomLeft);
mat2d.scale(
transform,
transform,
vec2.divide(vec2.create(), this.worldAreaInView, resolution)
);
mat2d.translate(transform, transform, vec2.fromValues(0.5, 0.5));
return vec2.transformMat2d(vec2.create(), position, transform);
mat2d.translate(transform, transform, vec2.fromValues(0.5, height - 0.5));
return mat2d.scale(transform, transform, vec2.fromValues(1, -1));
}
}