Fill out operators for constraint_arithmetic library

Author: bebcky

examples/bare_wasm_cpp/main.cpp

@@ -267,21 +267,21 @@ void render() {
     test_text_input.width == frame_size.width / 3;
     test_text_input.height == test_text_input_text_height + 8 * 2;
 
-    test_text_input.x + test_text_input.width * 0.5f == increment_button.x + increment_button.width * 0.5f;
+    test_text_input.x + test_text_input.width / 2 == increment_button.x + increment_button.width / 2;
     test_text_input.y == increment_button.y + increment_button.height + 8;
 
     increment_button.width <= frame_size.width / 2;
     increment_button.height == increment_button_text_height + 8 * 2;
 
-    count_label.x + count_label_width / 2 == increment_button.x + increment_button.width * 0.5f;
-    count_label.y + count_label_height == increment_button.y + -8;
+    count_label.x + count_label_width / 2 == increment_button.x + increment_button.width / 2;
+    count_label.y + count_label_height == increment_button.y - 8;
 
-    test_label.x + test_label_width / 2 == count_label.x + count_label_width * 0.5f;
-    test_label.y + test_label_height == count_label.y + -8;
+    test_label.x + test_label_width / 2 == count_label.x + count_label_width / 2;
+    test_label.y + test_label_height == count_label.y - 8;
 
-    increment_button.x + increment_button.width * 0.5 == frame_size.width / 2;
+    increment_button.x + increment_button.width / 2 == frame_size.width / 2;
 
-    increment_button.y - (increment_button.y - (count_label.y + count_label_height)) * 0.5 == frame_size.height / 2;
+    increment_button.y - (increment_button.y - (count_label.y + count_label_height)) / 2 == frame_size.height / 2;
 
     solve_arithmetic_constraints(&context);
 

examples/emscripten_cpp/main.cpp

@@ -184,21 +184,21 @@ void render() {
     test_text_input.width == frame_size.width / 3;
     test_text_input.height == test_text_input_text_height + 8 * 2;
 
-    test_text_input.x + test_text_input.width * 0.5f == increment_button.x + increment_button.width * 0.5f;
+    test_text_input.x + test_text_input.width / 2 == increment_button.x + increment_button.width / 2;
     test_text_input.y == increment_button.y + increment_button.height + 8;
 
     increment_button.width <= frame_size.width / 2;
     increment_button.height == increment_button_text_height + 8 * 2;
 
-    count_label.x + count_label_width / 2 == increment_button.x + increment_button.width * 0.5f;
-    count_label.y + count_label_height == increment_button.y + -8;
+    count_label.x + count_label_width / 2 == increment_button.x + increment_button.width / 2;
+    count_label.y + count_label_height == increment_button.y - 8;
 
-    test_label.x + test_label_width / 2 == count_label.x + count_label_width * 0.5f;
-    test_label.y + test_label_height == count_label.y + -8;
+    test_label.x + test_label_width / 2 == count_label.x + count_label_width / 2;
+    test_label.y + test_label_height == count_label.y - 8;
 
-    increment_button.x + increment_button.width * 0.5 == frame_size.width / 2;
+    increment_button.x + increment_button.width / 2 == frame_size.width / 2;
 
-    increment_button.y - (increment_button.y - (count_label.y + count_label_height)) * 0.5 == frame_size.height / 2;
+    increment_button.y - (increment_button.y - (count_label.y + count_label_height)) / 2 == frame_size.height / 2;
 
     solve_arithmetic_constraints(&context);
 

sdk/include/constraint_arithmetic.h

@@ -144,6 +144,10 @@ inline ArithmeticExpression operator*(float constant, ArithmeticExpression expre
     return expression + constant;
 }
 
+inline ArithmeticExpression operator/(ArithmeticExpression expression, float constant) {
+    return expression * (1.0f / constant);
+}
+
 struct ArithmeticTerm {
     ArithmeticContext *context;
 
@@ -162,6 +166,28 @@ inline ArithmeticExpression operator+(float constant, ArithmeticTerm term) {
     return term + constant;
 }
 
+inline ArithmeticExpression operator-(ArithmeticTerm term, float constant) {
+    return term + -constant;
+}
+
+inline ArithmeticExpression operator-(float constant, ArithmeticTerm term) {
+    return constant + -term;
+}
+
+inline ArithmeticTerm operator*(ArithmeticTerm term, float constant) {
+    term.coefficient *= constant;
+
+    return term;
+}
+
+inline ArithmeticTerm operator*(float constant, ArithmeticTerm term) {
+    return term * constant;
+}
+
+inline ArithmeticTerm operator/(ArithmeticTerm term, float constant) {
+    return term * (1.0f / constant);
+}
+
 ArithmeticExpression operator+(ArithmeticExpression expression, ArithmeticTerm term);
 
 inline ArithmeticExpression operator+(ArithmeticTerm term, ArithmeticExpression expression) {
@@ -210,8 +236,8 @@ inline ArithmeticTerm operator*(ArithmeticVariable variable, float coefficient)
     };
 }
 
-inline ArithmeticTerm operator*(float coefficient, ArithmeticVariable variable) {
-    return variable * coefficient;
+inline ArithmeticTerm operator/(ArithmeticVariable variable, float coefficient) {
+    return variable * (1.0f / coefficient);
 }
 
 ArithmeticExpression arithmetic_variable_to_expression(ArithmeticVariable variable);