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Improve mouse logic

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This commit is contained in:
Josh Colclough 2023-10-25 21:26:22 +01:00
parent 8881e597f0
commit 067b52a159
1 changed files with 16 additions and 19 deletions
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33
examples/shaders/shaders_julia_set.c
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@ -9,12 +9,12 @@
*
* Example originally created with raylib 2.5, last time updated with raylib 4.0
*
* Example contributed by eggmund (@eggmund) and reviewed by Ramon Santamaria (@raysan5)
* Example contributed by Josh Colclough (@joshcol9232) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2019-2023 eggmund (@eggmund) and Ramon Santamaria (@raysan5)
* Copyright (c) 2019-2023 Josh Colclough (@joshcol9232) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
@ -46,8 +46,8 @@ int main(void)
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
const float zoomSpeed = 1.005f;
//SetConfigFlags(FLAG_WINDOW_HIGHDPI);
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - julia sets");
// Load julia set shader
@ -64,8 +64,6 @@ int main(void)
float offset[2] = { -(float)GetScreenWidth()/2, -(float)GetScreenHeight()/2 };
float zoom = 1.0f;
Vector2 offsetSpeed = { 0.0f, 0.0f };
// Get variable (uniform) locations on the shader to connect with the program
// NOTE: If uniform variable could not be found in the shader, function returns -1
int cLoc = GetShaderLocation(shader, "c");
@ -97,6 +95,7 @@ int main(void)
{
if (IsKeyPressed(k))
{
// If this key is pressed, set the point of interest of the corresponding key.
c[0] = pointsOfInterest[k - KEY_ONE][0];
c[1] = pointsOfInterest[k - KEY_ONE][1];
SetShaderValue(shader, cLoc, c, SHADER_UNIFORM_VEC2);
@ -112,24 +111,22 @@ int main(void)
if (IsKeyPressed(KEY_RIGHT)) incrementSpeed++;
else if (IsKeyPressed(KEY_LEFT)) incrementSpeed--;
// TODO: The idea is to zoom and move around with the mouse
if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) || IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
// If either left or right button is pressed, zoom in/out.
const bool leftMouseButtonDown = IsMouseButtonDown(MOUSE_BUTTON_LEFT);
if (leftMouseButtonDown ^ IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
{
if (IsMouseButtonDown(MOUSE_BUTTON_LEFT)) zoom += zoom * 0.003f;
if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) zoom -= zoom * 0.003f;
// Change zoom. If Mouse left -> zoom in. Mouse right -> zoom out.
zoom *= leftMouseButtonDown ? zoomSpeed : 1.0f / zoomSpeed;
const Vector2 mousePos = GetMousePosition();
Vector2 offsetVelocity;
offsetVelocity.x = zoom * (mousePos.x - (float)screenWidth / 2.0);
offsetVelocity.y = zoom * (mousePos.y - (float)screenHeight / 2.0);
offsetSpeed.x = zoom * (mousePos.x - (float)screenWidth / 2.0);
offsetSpeed.y = zoom * (mousePos.y - (float)screenHeight / 2.0);
// Slowly move camera to targetOffset
offset[0] += GetFrameTime() * offsetSpeed.x;
offset[1] += GetFrameTime() * offsetSpeed.y;
// Apply move velocity to camera
offset[0] += GetFrameTime() * offsetVelocity.x;
offset[1] += GetFrameTime() * offsetVelocity.y;
}
else offsetSpeed = (Vector2){ 0.0f, 0.0f };
SetShaderValue(shader, zoomLoc, &zoom, SHADER_UNIFORM_FLOAT);
SetShaderValue(shader, offsetLoc, offset, SHADER_UNIFORM_VEC2);