From: Martin Taibr <taibr.martin@gmail.com>
Date: Thu, 10 Aug 2017 22:02:21 +0000 (+0200)
Subject: map_ranges()
X-Git-Tag: xonotic-v0.8.5~2430^2~35
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=5f964d1c1c47777cf4b703f9b2f4061fbb329423;p=xonotic%2Fxonotic-data.pk3dir.git

map_ranges()
---

diff --git a/qcsrc/common/mutators/mutator/damagetext/cl_damagetext.qc b/qcsrc/common/mutators/mutator/damagetext/cl_damagetext.qc
index fbb6bcb75..53042b8ef 100644
--- a/qcsrc/common/mutators/mutator/damagetext/cl_damagetext.qc
+++ b/qcsrc/common/mutators/mutator/damagetext/cl_damagetext.qc
@@ -158,13 +158,9 @@ CLASS(DamageText, Object)
         if (this.text) strunzone(this.text);
         this.text = strzone(s);
 
-        float size_range = autocvar_cl_damagetext_size_max - autocvar_cl_damagetext_size_min;
-        float damage_range = autocvar_cl_damagetext_size_max_damage - autocvar_cl_damagetext_size_min_damage;
-        float scale_factor = size_range / damage_range;
-        this.m_size = bound(
-            autocvar_cl_damagetext_size_min,
-            (potential - autocvar_cl_damagetext_size_min_damage) * scale_factor + autocvar_cl_damagetext_size_min,
-            autocvar_cl_damagetext_size_max);
+        this.m_size = map_bound_ranges(potential,
+            autocvar_cl_damagetext_size_min_damage, autocvar_cl_damagetext_size_max_damage,
+            autocvar_cl_damagetext_size_min, autocvar_cl_damagetext_size_max);
     }
 
     CONSTRUCTOR(DamageText, int _group, vector _origin, bool _screen_coords, int _health, int _armor, int _potential_damage, int _deathtype, bool _friendlyfire) {
diff --git a/qcsrc/lib/math.qh b/qcsrc/lib/math.qh
index 8ba31516d..85ae496e3 100644
--- a/qcsrc/lib/math.qh
+++ b/qcsrc/lib/math.qh
@@ -322,3 +322,22 @@ vector solve_quadratic(float a, float b, float c)
 	}
 	return v;
 }
+
+/// Maps values between the src and dest range: src_min to dest_min, src_max to dest_max, values between them
+/// to the curresponding values between and extrapolates for values outside the range.
+///
+/// Max can be lower than min if you want to invert the range, values can be negative.
+ERASEABLE
+float map_ranges(float value, float src_min, float src_max, float dest_min, float dest_max) {
+	float velocity_diff = src_max - src_min;
+	float force_diff = dest_max - dest_min;
+	float ratio = (value - src_min) / velocity_diff;
+	return dest_min + force_diff * ratio;
+}
+
+/// Same as `map_ranges` except that values outside the source range are clamped to min or max.
+ERASEABLE
+float map_bound_ranges(float value, float src_min, float src_max, float dest_min, float dest_max) {
+	value = bound(src_min, value, src_max);
+	return map_ranges(value, src_min, src_max, dest_min, dest_max);
+}