[rshapes] Review DrawGradient color parameter names (#4270)

void DrawCircleGradient(int centerX, int centerY, float radius, Color color1, Color color2);
void DrawRectangleGradientV(int posX, int posY, int width, int height, Color color1, Color color2);
void DrawRectangleGradientH(int posX, int posY, int width, int height, Color color1, Color color2);
void DrawRectangleGradientEx(Rectangle rec, Color col1, Color col2, Color col3, Color col4);

Have been changed to:

void DrawCircleGradient(int centerX, int centerY, float radius, Color inner, Color outer);
void DrawRectangleGradientV(int posX, int posY, int width, int height, Color top, Color bottom);
void DrawRectangleGradientH(int posX, int posY, int width, int height, Color left, Color right);
void DrawRectangleGradientEx(Rectangle rec, Color topLeft, Color bottomLeft, Color topRight, Color bottomRight);

src/raylib.h

@@ -1238,7 +1238,7 @@ RLAPI void DrawLineBezier(Vector2 startPos, Vector2 endPos, float thick, Color c
 RLAPI void DrawCircle(int centerX, int centerY, float radius, Color color);                              // Draw a color-filled circle
 RLAPI void DrawCircleSector(Vector2 center, float radius, float startAngle, float endAngle, int segments, Color color);      // Draw a piece of a circle
 RLAPI void DrawCircleSectorLines(Vector2 center, float radius, float startAngle, float endAngle, int segments, Color color); // Draw circle sector outline
-RLAPI void DrawCircleGradient(int centerX, int centerY, float radius, Color color1, Color color2);       // Draw a gradient-filled circle
+RLAPI void DrawCircleGradient(int centerX, int centerY, float radius, Color inner, Color outer);         // Draw a gradient-filled circle
 RLAPI void DrawCircleV(Vector2 center, float radius, Color color);                                       // Draw a color-filled circle (Vector version)
 RLAPI void DrawCircleLines(int centerX, int centerY, float radius, Color color);                         // Draw circle outline
 RLAPI void DrawCircleLinesV(Vector2 center, float radius, Color color);                                  // Draw circle outline (Vector version)
@@ -1250,9 +1250,9 @@ RLAPI void DrawRectangle(int posX, int posY, int width, int height, Color color)
 RLAPI void DrawRectangleV(Vector2 position, Vector2 size, Color color);                                  // Draw a color-filled rectangle (Vector version)
 RLAPI void DrawRectangleRec(Rectangle rec, Color color);                                                 // Draw a color-filled rectangle
 RLAPI void DrawRectanglePro(Rectangle rec, Vector2 origin, float rotation, Color color);                 // Draw a color-filled rectangle with pro parameters
-RLAPI void DrawRectangleGradientV(int posX, int posY, int width, int height, Color color1, Color color2);// Draw a vertical-gradient-filled rectangle
-RLAPI void DrawRectangleGradientH(int posX, int posY, int width, int height, Color color1, Color color2);// Draw a horizontal-gradient-filled rectangle
-RLAPI void DrawRectangleGradientEx(Rectangle rec, Color col1, Color col2, Color col3, Color col4);       // Draw a gradient-filled rectangle with custom vertex colors
+RLAPI void DrawRectangleGradientV(int posX, int posY, int width, int height, Color top, Color bottom);   // Draw a vertical-gradient-filled rectangle
+RLAPI void DrawRectangleGradientH(int posX, int posY, int width, int height, Color left, Color right);   // Draw a horizontal-gradient-filled rectangle
+RLAPI void DrawRectangleGradientEx(Rectangle rec, Color topLeft, Color bottomLeft, Color topRight, Color bottomRight); // Draw a gradient-filled rectangle with custom vertex colors
 RLAPI void DrawRectangleLines(int posX, int posY, int width, int height, Color color);                   // Draw rectangle outline
 RLAPI void DrawRectangleLinesEx(Rectangle rec, float lineThick, Color color);                            // Draw rectangle outline with extended parameters
 RLAPI void DrawRectangleRounded(Rectangle rec, float roundness, int segments, Color color);              // Draw rectangle with rounded edges

src/rshapes.c

@@ -430,17 +430,16 @@ void DrawCircleSectorLines(Vector2 center, float radius, float startAngle, float
 }
 
 // Draw a gradient-filled circle
-// NOTE: Gradient goes from center (color1) to border (color2)
-void DrawCircleGradient(int centerX, int centerY, float radius, Color color1, Color color2)
+void DrawCircleGradient(int centerX, int centerY, float radius, Color inner, Color outer)
 {
     rlBegin(RL_TRIANGLES);
         for (int i = 0; i < 360; i += 10)
         {
-            rlColor4ub(color1.r, color1.g, color1.b, color1.a);
+            rlColor4ub(inner.r, inner.g, inner.b, inner.a);
             rlVertex2f((float)centerX, (float)centerY);
-            rlColor4ub(color2.r, color2.g, color2.b, color2.a);
+            rlColor4ub(outer.r, outer.g, outer.b, outer.a);
             rlVertex2f((float)centerX + cosf(DEG2RAD*(i + 10))*radius, (float)centerY + sinf(DEG2RAD*(i + 10))*radius);
-            rlColor4ub(color2.r, color2.g, color2.b, color2.a);
+            rlColor4ub(outer.r, outer.g, outer.b, outer.a);
             rlVertex2f((float)centerX + cosf(DEG2RAD*i)*radius, (float)centerY + sinf(DEG2RAD*i)*radius);
         }
     rlEnd();
@@ -761,22 +760,19 @@ void DrawRectanglePro(Rectangle rec, Vector2 origin, float rotation, Color color
 }
 
 // Draw a vertical-gradient-filled rectangle
-// NOTE: Gradient goes from bottom (color1) to top (color2)
-void DrawRectangleGradientV(int posX, int posY, int width, int height, Color color1, Color color2)
+void DrawRectangleGradientV(int posX, int posY, int width, int height, Color top, Color bottom)
 {
-    DrawRectangleGradientEx((Rectangle){ (float)posX, (float)posY, (float)width, (float)height }, color1, color2, color2, color1);
+    DrawRectangleGradientEx((Rectangle){ (float)posX, (float)posY, (float)width, (float)height }, top, bottom, bottom, top);
 }
 
 // Draw a horizontal-gradient-filled rectangle
-// NOTE: Gradient goes from bottom (color1) to top (color2)
-void DrawRectangleGradientH(int posX, int posY, int width, int height, Color color1, Color color2)
+void DrawRectangleGradientH(int posX, int posY, int width, int height, Color left, Color right)
 {
-    DrawRectangleGradientEx((Rectangle){ (float)posX, (float)posY, (float)width, (float)height }, color1, color1, color2, color2);
+    DrawRectangleGradientEx((Rectangle){ (float)posX, (float)posY, (float)width, (float)height }, left, left, right, right);
 }
 
 // Draw a gradient-filled rectangle
-// NOTE: Colors refer to corners, starting at top-lef corner and counter-clockwise
-void DrawRectangleGradientEx(Rectangle rec, Color col1, Color col2, Color col3, Color col4)
+void DrawRectangleGradientEx(Rectangle rec, Color topLeft, Color bottomLeft, Color topRight, Color bottomRight)
 {
     rlSetTexture(GetShapesTexture().id);
     Rectangle shapeRect = GetShapesTextureRectangle();
@@ -785,19 +781,19 @@ void DrawRectangleGradientEx(Rectangle rec, Color col1, Color col2, Color col3,
         rlNormal3f(0.0f, 0.0f, 1.0f);
 
         // NOTE: Default raylib font character 95 is a white square
-        rlColor4ub(col1.r, col1.g, col1.b, col1.a);
+        rlColor4ub(topLeft.r, topLeft.g, topLeft.b, topLeft.a);
         rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
         rlVertex2f(rec.x, rec.y);
 
-        rlColor4ub(col2.r, col2.g, col2.b, col2.a);
+        rlColor4ub(bottomLeft.r, bottomLeft.g, bottomLeft.b, bottomLeft.a);
         rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
         rlVertex2f(rec.x, rec.y + rec.height);
 
-        rlColor4ub(col3.r, col3.g, col3.b, col3.a);
+        rlColor4ub(topRight.r, topRight.g, topRight.b, topRight.a);
         rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
         rlVertex2f(rec.x + rec.width, rec.y + rec.height);
 
-        rlColor4ub(col4.r, col4.g, col4.b, col4.a);
+        rlColor4ub(bottomRight.r, bottomRight.g, bottomRight.b, bottomRight.a);
         rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
         rlVertex2f(rec.x + rec.width, rec.y);
     rlEnd();