Grid - widget for holding multi-layer map data

src/Grid.cpp

@@ -0,0 +1,113 @@
+#include "Grid.h"
+#include <cmath>
+
+GridPoint::GridPoint():
+    color(0, 0, 0, 0), walkable(true), tilesprite(-1), transparent(true), visible(false), discovered(false), color_overlay(0,0,0,255), tile_overlay(-1), uisprite(-1)
+{};
+
+void Grid::setSprite(int ti)
+{
+        int tx = ti % texture_width, ty = ti / texture_width;
+            sprite.setTextureRect(sf::IntRect(tx * grid_size, ty * grid_size, grid_size, grid_size));
+}
+
+Grid::Grid(int gx, int gy, int gs, int _x, int _y, int _w, int _h):
+    grid_size(gs), 
+    grid_x(gx), grid_y(gy), 
+    zoom(1.0f), center_x(gx), center_y(gy),
+    texture_width(12), texture_height(11)
+{
+    //grid_size = gs;
+    //zoom = 1.0f;
+    //grid_x = gx;
+    //grid_y = gy;
+    points.resize(gx*gy);
+    box.setSize(sf::Vector2f(_w, _h));
+    box.setPosition(sf::Vector2f(_x, _y));
+    box.setFillColor(sf::Color(0,0,0,0));
+
+    renderTexture.create(_w, _h);
+
+    texture.loadFromFile("./assets/kenney_tinydungeon.png");
+    texture.setSmooth(false);
+    sprite.setTexture(texture);
+
+    //output.setSize(box.getSize());
+    output.setTextureRect(
+        sf::IntRect(0, 0,
+        box.getSize().x, box.getSize().y));
+    output.setPosition(box.getPosition());
+    // textures are upside-down inside renderTexture
+    output.setTexture(renderTexture.getTexture());
+
+    // Show one texture at a time
+    sprite.setTexture(texture);
+}
+
+void Grid::render(sf::RenderWindow & window)
+{
+    renderTexture.clear();
+    //renderTexture.draw(box);
+
+    // sprites that are visible according to zoom, center_x, center_y, and box width
+    auto box_size = box.getSize();
+    float view_width = box_size.x / (grid_size * zoom);
+    float view_height = box_size.y / (grid_size * zoom);
+
+    float top_offset = (center_y * grid_size) - box_size.y/2.0f;
+    float left_offset = (center_x * grid_size) - box_size.x/2.0f;
+
+    sprite.setScale(sf::Vector2f(zoom, zoom));
+
+    auto box_pos = box.getPosition();
+
+    int x_start = std::floor(center_x - view_width/2.0f);
+    int x_end = std::ceil(center_x + view_width/2.0f);
+    int y_start = std::floor(center_y - view_height/2.0f);
+    int y_end = std::ceil(center_y + view_height/2.0f);
+
+    for (int x = 0; 
+        x < grid_x; //x < view_width; 
+        x++)
+    {
+        for (int y = 0; 
+            y < grid_y; //y < view_height;
+            y++)
+        {
+            // convert grid's coordinate to pixel coords to draw
+            //float window_x = (x_start + x) * grid_size * zoom;
+            //float window_y = (y_start + y) * grid_size * zoom;
+            float natural_x = x * grid_size * zoom;
+            float natural_y = y * grid_size * zoom;
+            sprite.setPosition(
+                sf::Vector2f(natural_x - left_offset, 
+                             natural_y - top_offset));
+            
+            auto gridPoint = at(x, y);
+            // color?
+
+            // tilesprite
+            // if discovered but not visible, set opacity to 90%
+            // if not discovered... just don't draw it?
+            setSprite(at(x, y).tilesprite);
+            renderTexture.draw(sprite);
+
+            // overlay
+
+            // uisprite
+
+        }
+    }
+
+    // grid lines for testing & validation
+
+
+    // render to window
+    renderTexture.display();
+    window.draw(output);
+}
+
+GridPoint& Grid::at(int x, int y)
+{
+    return points[y * grid_x + x];
+}