viseq/src/canvas.h

#pragma once

#include "draggable.h"
#include "raylib.h"
#include "raymath.h"
#include "state.h"
namespace VISEQ::APP::CANVAS {
	class Canvas : public BASE::Draggable {
		public:
			Canvas() {}

			Camera2D camera;
			Vec2Df camera_delta;
			Vec2Df select_start;

			virtual bool hovering() override {	
				return true;
			}

			virtual void drag() override {
				if(state->mouse_right.down) {
					camera.target = Vector2Add(camera.target, camera_delta);
				}
			}
			
			virtual void drawStart(){
				BeginMode2D(camera);
				/*state->hovering = false;*/
				/*if(hovering()) state->istate = InteractionState::HOVER_CANVAS;*/
			}

			virtual void drawEnd(){
				EndMode2D();
			}
			
			void selectNodes(){
				if(state->mouse_left.clicked){
					state->selection = (Rectangle){0,0,0,0};
					select_start = state->screen_mouse;
					state->istate = InteractionState::DRAW_SELECTION;
				}
			
				if(state->mouse_left.down){
					Vec2Df select1 = {state->screen_mouse.x > select_start.x ? select_start.x : state->screen_mouse.x, state->screen_mouse.y > select_start.y ? select_start.y : state->screen_mouse.y};
					Vec2Df select2 = {state->screen_mouse.x > select_start.x ? state->screen_mouse.x - select_start.x : select_start.x - state->screen_mouse.x, state->screen_mouse.y > select_start.y ? state->screen_mouse.y - select_start.y : select_start.y - state->screen_mouse.y};
					state->selection = (Rectangle){select1.x, select1.y, select2.x, select2.y};
				}

				if(state->mouse_left.released){
					state->istate = InteractionState::HOVER_CANVAS;	
				}
			}

			virtual void update() override {
				camera_delta = state->mouse_delta * (-1.0f/camera.zoom);
				if(hovering()) drag();
				if(state->istate == InteractionState::HOVER_CANVAS || state->istate == InteractionState::DRAW_SELECTION) selectNodes();

				float wheel = GetMouseWheelMove();
				if(wheel != 0){
					if(!IsKeyDown(KEY_LEFT_SHIFT) && !IsKeyDown(KEY_LEFT_CONTROL) && !IsKeyDown(KEY_LEFT_ALT)){
						camera.offset = state->raw_mouse;
						camera.target = state->screen_mouse;
						float scaleFactor = 1.0f + (0.25f*fabsf(wheel));
						if (wheel < 0) scaleFactor = 1.0f/scaleFactor;
						camera.zoom = Clamp(camera.zoom*scaleFactor, 0.125f, 64.0f);
					}
				}
			}

			virtual void draw(){
				if(state->istate == InteractionState::DRAW_SELECTION) DrawRectangleLines(state->selection.x, state->selection.y, state->selection.width, state->selection.height, (Color){150,150,150,150});

				for(int x = -state->settings.grid*100; x < state->settings.grid*100; x+=state->settings.grid){
					for(int y = -state->settings.grid*100; y < state->settings.grid*100; y+=state->settings.grid){
						DrawPixel(x, y, (Color){130,130,130,200});
					}
				}
			}
	};
}