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Improve Cairo demo program

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- remove unused variables
- add comments
- center drawn buttons
- make text slightly smaller to fit into button
- reorder button colors (r, g, b)
This commit is contained in:
Albrecht Schlosser 2019-11-21 15:03:14 +01:00
parent ee9ada9678
commit 61a86d1941
1 changed files with 18 additions and 14 deletions
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28
test/cairo_test.cxx
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@ -30,9 +30,7 @@
// uncomment the following line to enable Cairo context autolink feature: // uncomment the following line to enable Cairo context autolink feature:
// #define AUTOLINK // #define AUTOLINK
// put your drawing stuff here // draw centered text
float drawargs[7] = {90, 90, 100, 100, 0, 360, 0};
const char *name[7] = {"X", "Y", "W", "H", "start", "end", "rotate"};
static void centered_text(cairo_t *cr, double x0, double y0, double w0, double h0, const char *my_text) { static void centered_text(cairo_t *cr, double x0, double y0, double w0, double h0, const char *my_text) {
cairo_select_font_face(cr, "Sans", CAIRO_FONT_SLANT_OBLIQUE, CAIRO_FONT_WEIGHT_BOLD); cairo_select_font_face(cr, "Sans", CAIRO_FONT_SLANT_OBLIQUE, CAIRO_FONT_WEIGHT_BOLD);
@ -50,12 +48,12 @@ static void centered_text(cairo_t *cr, double x0, double y0, double w0, double h
cairo_set_line_width(cr, DEF_WIDTH); cairo_set_line_width(cr, DEF_WIDTH);
} }
// draw a button object with rounded corners and a label
static void round_button(cairo_t *cr, double x0, double y0, static void round_button(cairo_t *cr, double x0, double y0,
double rect_width, double rect_height, double radius, double rect_width, double rect_height, double radius,
double r, double g, double b) { double r, double g, double b) {
double x1, y1; double x1, y1;
x1 = x0 + rect_width; x1 = x0 + rect_width;
y1 = y0 + rect_height; y1 = y0 + rect_height;
if (!rect_width || !rect_height) if (!rect_width || !rect_height)
@ -112,21 +110,27 @@ static void round_button(cairo_t *cr, double x0, double y0,
cairo_set_source_rgba(cr, 0, 0, 0.5, 0.3); cairo_set_source_rgba(cr, 0, 0, 0.5, 0.3);
cairo_stroke(cr); cairo_stroke(cr);
cairo_set_font_size(cr, 0.08); cairo_set_font_size(cr, 0.075);
centered_text(cr, x0, y0, rect_width, rect_height, "FLTK loves Cairo!"); centered_text(cr, x0, y0, rect_width, rect_height, "FLTK loves Cairo!");
} }
// The Cairo rendering cb called during Fl_Cairo_Window::draw() : // draw the entire image (3 buttons), scaled to the given width and height
static void my_cairo_draw_cb(Fl_Cairo_Window *window, cairo_t *cr) {
int w = window->w(), h = window->h(); void draw_image(cairo_t *cr, int w, int h) {
cairo_set_line_width(cr, DEF_WIDTH); cairo_set_line_width(cr, DEF_WIDTH);
cairo_scale(cr, w, h); cairo_scale(cr, w, h);
round_button(cr, 0.1, 0.05, 0.8, 0.2, 0.4, 0, 0, 1); round_button(cr, 0.1, 0.1, 0.8, 0.2, 0.4, 1, 0, 0);
round_button(cr, 0.1, 0.35, 0.8, 0.2, 0.4, 1, 0, 0); round_button(cr, 0.1, 0.4, 0.8, 0.2, 0.4, 0, 1, 0);
round_button(cr, 0.1, 0.65, 0.8, 0.2, 0.4, 0, 1, 0); round_button(cr, 0.1, 0.7, 0.8, 0.2, 0.4, 0, 0, 1);
} // draw_image()
// Cairo rendering cb called during Fl_Cairo_Window::draw()
static void my_cairo_draw_cb(Fl_Cairo_Window *window, cairo_t *cr) {
draw_image(cr, window->w(), window->h());
return; return;
} }