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Hanno Braun 2025-10-05 10:45:55 +02:00
parent 10a8f84d84
commit 8db2894181
1 changed files with 10 additions and 10 deletions
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20
experiments/2025-03-18/src/viewer/graphics/text.rs
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@ -88,22 +88,22 @@ impl TextRenderer {
transform.inner().transform_point(&label.position); transform.inner().transform_point(&label.position);
// The transform above has transformed the point into normalized // The transform above has transformed the point into normalized
// device coordinates, but we need pixel coordinates. Let's start // device coordinates, but we need pixel coordinates. Let's
// with moving the coordinate system origin to the upper-left // start with moving the coordinate system origin to the upper-
// corner. // left corner.
point += Vector::from([1., -1., 0.]); point += Vector::from([1., -1., 0.]);
// Normalized device coordinates cover the range from -1 to 1. // Normalized device coordinates cover the range from -1 to 1.
// Before we can multiply that with the screen size, we need to get // Before we can multiply that with the screen size, we need to
// a range from 0 to 1. While we're at that, also invert the y-axis, // get a range from 0 to 1. While we're at that, also invert the
// to match the pixel coordinate system that we need. // y-axis, to match the pixel coordinate system that we need.
point.x *= 0.5; point.x *= 0.5;
point.y *= -0.5; point.y *= -0.5;
// At this point, we've transformed the position into a normalized // At this point, we've transformed the position into a
// coordinate system (with range 0 to 1) with the origin in the // normalized coordinate system (with range 0 to 1) with the
// upper- left corner. All that's left is to multiply by the screen // origin in the upper-left corner. All that's left is to
// size, and we have pixel coordinates. // multiply by the screen size, and we have pixel coordinates.
point.x *= surface_config.width as f64; point.x *= surface_config.width as f64;
point.y *= surface_config.height as f64; point.y *= surface_config.height as f64;