TheGrandVisualizerShow/camera.c

//Standard lib

//Third party
#include "raylib.h"

//Our own files
#include "constants.h"
#include "programstate.h"
#include "camera.h"

extern ProgramState programState;


// https://www.raylib.com/examples/web/core/loader.html?name=core_2d_camera
//Camera controls, such as zoom and reset, are in gui.c

static int screenWidth;
static int screenHeight;

void cameraMoveUpdate() {
    programState.camera.offset = (Vector2){ screenWidth/2+programState.cameraCenterOnX, screenHeight/2+programState.cameraCenterOnY };
}

void cameraLeft() {
    programState.cameraCenterOnX -= 10;
    cameraMoveUpdate();
}
void cameraRight() {
    programState.cameraCenterOnX += 10;
    cameraMoveUpdate();
}
void cameraUp() {
    programState.cameraCenterOnY -= 10;
    cameraMoveUpdate();
}
void cameraDown() {
    programState.cameraCenterOnY += 10;
    cameraMoveUpdate();
}

void cameraMaybeZoom() {
    //float rememberZoom = programState.camera.zoom;
    if (!programState.lockInput) {
        programState.camera.zoom += ((float)GetMouseWheelMove()*0.05f);
        if (programState.camera.zoom < 0)
            programState.camera.zoom =  0.0f;
        //if (rememberZoom != programState.camera.zoom) {}
    }
}

void cameraReset() {
    //Only called through user action. Camera startup values are either loaded from file or set in programstate.c
    programState.camera.zoom = 1.0f;
    programState.camera.rotation = 0.0f;
    programState.cameraCenterOnX = 0;
    programState.cameraCenterOnY = 0;
    cameraMoveUpdate();
}

void cameraNormalizeRotation() {
    if (programState.camera.rotation > 359) programState.camera.rotation -= 360;
    else if (programState.camera.rotation < 0) programState.camera.rotation += 360;
}

void cameraRotateLeft() {
    programState.camera.rotation--;
    cameraNormalizeRotation();
}

void cameraRotateRight() {
    programState.camera.rotation++;
    cameraNormalizeRotation();
}

void cameraRotate180() {
    programState.camera.rotation += 180.0f;
    cameraNormalizeRotation();
}

void cameraFlip() {
    programState.camera.zoom *= -1.0f; //this is the same as rotation by 180, and not mirror
    //programState.camera.rotation += 180.0f;
}

void mainLoop_cameraReposition() {
    if (programState.guiRedrawNeeded) {
        screenWidth = GetScreenWidth(); //Changes on resize
        screenHeight = GetScreenHeight(); //Changes on resize
        programState.camera.target = (Vector2){ screenWidth/2, screenHeight/2 };
        programState.camera.offset = (Vector2){ screenWidth/2+programState.cameraCenterOnX, screenHeight/2+programState.cameraCenterOnY };
    }
}