add color.h, create draw_image()

1 files changed, 66 insertions, 32 deletions

diff --git a/src/draw.c b/src/draw.c
index 2489ada..3fc8244 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -3,6 +3,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "color.h"
+
 // struct for storing dimensions used for calculations, movement, etc.
 struct dimensions {
    // Multiplication factors
@@ -22,17 +24,24 @@ struct dimensions {
    double margin;	/* margin */
 };
 
+// struct to hold Month-specific info, like what day of the week the first
+// day lands on, how many days are in the month, etc.
 struct month_info {
    int first_day;
    int num_of_days;
 };
 
+
 struct RGB {
    double r;
    double g;
    double b;
 };
 
+
+// Convert Hex color strings to their RGB counterparts.
+// IMO, hex strings are easier to work with, so this is 
+// a nice helper function.
 struct RGB hex_to_rgb(char *str) {
    double r, g, b;
    unsigned int ri, gi, bi;
@@ -44,8 +53,6 @@ struct RGB hex_to_rgb(char *str) {
    g = gi;
    b = bi;
 
-   printf("%d, %d, %d\n", ri, gi, bi);
-
    color.r = (r / 255.0);
    color.g = (g / 255.0);
    color.b = (b / 255.0);
@@ -53,9 +60,20 @@ struct RGB hex_to_rgb(char *str) {
    return color;
 }
 
+
+
+// Set a context's color using a HEX code. Color macros are defined
+// in color.h
+int set_color(cairo_t *c, char *hex) {
+   struct RGB color = hex_to_rgb(hex);
+   cairo_set_source_rgb (c, color.r, color.g, color.b);
+   return 0;
+}
+
+
 // Get the day of the week for a given day
-// Mostly used for calculating when the start of a month is
-// Relative to "Su Mo ... Sa" frame, not when Su and Sa are together
+// Used for calculating when the start of a month is
+// Relative to "Su Mo Tu ... Sa" frame, not when Su and Sa are together
 // Range is 0 -> 6
 // https://wiki.c2.com/?PerpetualCalendarAlgorithm
 int day_of_week (int d, int m, int y) {
@@ -75,7 +93,6 @@ int fill_bg(cairo_t *c) {
 
 
 
-// Draw text at a certain point.
 // Needn't be a string pointer, can be fixed array of chars
 // Requires Font Family (string) and Size (int)
 // Creates and destroys layout within the scope of the function
@@ -107,6 +124,8 @@ int draw_text (cairo_t *c, double x, double y, char *font_family, int font_size,
 }
 
 
+// Get the dimensions of a string of text
+// Returns a PangoRectangle struct
 PangoRectangle get_logical_extents (cairo_t *c, char *font_family, int font_size, char *text) {
    char font[100];
 
@@ -133,6 +152,7 @@ PangoRectangle get_logical_extents (cairo_t *c, char *font_family, int font_size
 
 
 // Calculate dimenions for one page and stores it in the dimensions struct
+// Used for determining where elements should be drawn on the page
 int calculate_dimensions(double pw, double ph, struct dimensions *d) {
    // Percentage of page that should be margin
    double margin = 0.1 * pw;
@@ -165,6 +185,8 @@ int calculate_dimensions(double pw, double ph, struct dimensions *d) {
 }
 
 
+// Print the contents of a dimensions struct. 
+// Use for debugging
 int print_dimensions(struct dimensions *d) {
    printf("row count:    %d\n", d->row_count);
    printf("column count:   %d\n", d->column_count);
@@ -180,6 +202,8 @@ int print_dimensions(struct dimensions *d) {
    return 0;
 }
 
+
+
 // Calculate minimum amount of rows a month can fit in.
 // Most months can fit within 4 or 5 rows instead of 6.
 // TBD: This can probably done in a more efficient way
@@ -210,8 +234,8 @@ int calculate_minimum_rows(struct month_info *m, struct dimensions *d) {
 }
 
 
-// Draws the lines for a month
-//int draw_month_grid (cairo_t *c, int month, int start_day) {
+
+// Draws the grid lines for a month
 int draw_month_grid (cairo_t *c, struct month_info *m, struct dimensions *d) {
    double cursor_x = d->month_top_corner_x;
 
@@ -221,7 +245,7 @@ int draw_month_grid (cairo_t *c, struct month_info *m, struct dimensions *d) {
    double x = cursor_x;
    double y = cursor_y;
 
-   cairo_set_source_rgb (c, 0.0, 0.0, 0.0);
+   set_color(c, BLACK);
    cairo_set_line_width (c, 1.0);
 
    for (int i = 0; i <= d->column_count; i++) {
@@ -268,38 +292,28 @@ int draw_month (cairo_t *c, cairo_t *cd, cairo_surface_t *s, struct month_info *
          // the function.
          if (increment >= m->num_of_days) return 0;
 
-         cairo_set_source_rgb (cd, 1.0, 1.0, 1.0);
-
-         //if ((k == 0) || (k == 6)) {
-         //cairo_set_source_rgb (cd, 0.76862745098, 0.533333333333, 0.18431372549);
-         //} else {
-         //   cairo_set_source_rgb (cd, 0.5, 0.5, 0.5);
-         //}
-
+         set_color(cd, WHITE);
          fill_bg(cd);
 
          // Change text color
-         cairo_set_source_rgb (cd, 0.0, 0.0, 0.0);
-         //cairo_set_source_rgb (cd, 255.0, 255.0, 255.0);
+         set_color(cd, BLACK);
 
-         // draw_text(), and by extension pango_layout_set_text(), needs a 
+
+         // draw_text(), and therefore pango_layout_set_text(), needs a 
          // string as input, so the current day's date is converted.
          snprintf(str, sizeof(str), "%d", increment + 1);
 
 
-         // Position within cd is arbitrary: (0,0) is too close to edge
+         // Position within cd is arbitrary: (0,0) is too close to edge,
+         // so the text is offset a little bit.
          draw_text(cd, 4.0, 4.0, "Sans", 10, str);
 
-         //if ((k == 0) || (k == 6)) {
-         //draw_text(cd, d->day_width - 40.0, d->day_height - 40.0, "Sans", 10, "▨");
-         //}
-
 
          // Position sub-surface on main surface
          cairo_set_source_surface (c, s, cursor_x, cursor_y);
          cairo_paint(c);
 
-         // Move cursor one box over 
+         // Move cursor one "box" over 
          cursor_x = cursor_x + d->day_width;
          increment++;
       } 
@@ -314,27 +328,47 @@ int draw_month (cairo_t *c, cairo_t *cd, cairo_surface_t *s, struct month_info *
    return 0;
 }
 
+
+
+// Draws the month being drawn at the top of the page
 int draw_month_title(cairo_t *c, struct dimensions *d, char *name) {
    PangoRectangle rect;
 
-   rect = get_logical_extents(c, "Sans", 40, name);
+   char *font = "Serif";
+   int font_size = 40;
 
+   rect = get_logical_extents(c, font, font_size, name);
 
    double cursor_x = (d->paper_width / 2.0) - ((rect.width / 2.0));
-   double cursor_y = 50.0;
-   draw_text(c, cursor_x, cursor_y, "Sans", 40, name);
+   double cursor_y = d->margin;
+   draw_text(c, cursor_x, cursor_y, font, font_size, name);
    return 0;
 }
 
 
-//int draw_weekday_names(cairo_t *c, struct dimensions *d) {
-//
-//}
-
 
+// Draw an image at a specified point
+int draw_image(cairo_t *c, char *path, double x, double y) {
+   cairo_surface_t *image;
+   image = cairo_image_surface_create_from_png(path);
+   cairo_set_source_surface(c, image, x, y);
+   cairo_paint(c);
 
+   cairo_surface_destroy (image);
+   return 0;
+}
 
 
 
+// Draw month art, if specified, above the calendar but below the
+// month's name. Images are cropped if they are too big or don't fit
+// the dimensions
+//int draw_month_art(cairo_t *c, struct dimensions *d) {
+//   
+//   return 0;
+//}
 
 
+//int draw_weekday_names(cairo_t *c, struct dimensions *d) {
+//
+//}