Draw SOIC pads

node_board/main.cpp

@@ -2,26 +2,55 @@
 #include <iostream>
 
 //--------------------------------------------------------------------------------------------------
+// All length measurements are in mm.
 int main() {
-    // All length measurements are in mm.
-    double width = 6;
-    double height = 14;
-
     double ppmm = 50;
     auto const to_px = [ppmm](double x) {
         return static_cast<uint32_t>(ppmm * x);
     };
 
-    uint32_t width_px = to_px(width);
-    uint32_t height_px = to_px(height);
+    // overall board dims
+    double const width = 6;
+    double const height = 14;
+    uint32_t const width_px = to_px(width);
+    uint32_t const height_px = to_px(height);
 
     PngWriter png_writer;
     png_writer.allocate(width_px, height_px);
     png_writer.set_all_pixels_black();
 
-    for (uint32_t y = 0; y < 10; ++y) {
-        for (uint32_t x = 0; x < 10; ++x) {
-            png_writer.set_pixel(x, y, 255);
+    auto const set_pixel = [&png_writer, height_px](uint32_t x, uint32_t y) {
+        png_writer.set_pixel(x, height_px - y - 1, 255);
+    };
+
+    // SOIC dims
+    double const pad_width = 0.5;
+    double const pad_height = 2.4;
+    //double const soic_width = 5;
+    double const soic_height = 7;
+    double const soic_pitch = 1.27;
+
+    // Draw the SOIC pads
+    double const soic_pos_x = 0.5 * (width - 3 * soic_pitch - pad_width);
+    double const soic_pos_y = 0.5 * (height - soic_height);
+    for (uint32_t i = 0; i < 4; ++i) {
+        double const pad_x_min = soic_pos_x + i * soic_pitch;
+        double const pad_x_max = pad_x_min + pad_width;
+
+        double pad_y_min = soic_pos_y;
+        double pad_y_max = pad_y_min + pad_height;
+        for (uint32_t x = to_px(pad_x_min); x < to_px(pad_x_max); ++x) {
+            for (uint32_t y = to_px(pad_y_min); y < to_px(pad_y_max); ++y) {
+                set_pixel(x, y);
+            }
+        }
+
+        pad_y_min = height - pad_y_max;
+        pad_y_max = pad_y_min + pad_height;
+        for (uint32_t x = to_px(pad_x_min); x < to_px(pad_x_max); ++x) {
+            for (uint32_t y = to_px(pad_y_min); y < to_px(pad_y_max); ++y) {
+                set_pixel(x, y);
+            }
         }
     }