67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#include "character_layer.h"
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#define CHARACTER_H 80
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#define CHARACTER_STEP 4
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static Layer *s_character_layer;
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static GBitmap *s_character_even;
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static GBitmap *s_character_odd;
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static int s_character_ticks;
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static void character_layer_update_proc(Layer *layer, GContext *ctx) {
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// Get the character bitmap.
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GBitmap *bitmap;
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if (s_character_ticks % 2 == 0) {
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bitmap = s_character_even;
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} else {
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bitmap = s_character_odd;
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}
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// Get the position of character bitmap and align it to bottom.
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GRect frame = gbitmap_get_bounds(bitmap);
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GRect frame_inside = layer_get_unobstructed_bounds(layer);
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grect_align(&frame, &frame_inside, GAlignBottom, true);
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// Move the character.
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switch (s_character_ticks) {
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case 1:
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frame.origin.x += CHARACTER_STEP; // to right
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break;
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case 3:
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frame.origin.x -= CHARACTER_STEP; // to left
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break;
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}
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// Draw the character.
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graphics_context_set_compositing_mode(ctx, GCompOpSet);
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graphics_draw_bitmap_in_rect(ctx, bitmap, frame);
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}
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void character_layer_init(Window *window) {
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s_character_ticks = 0;
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s_character_even = gbitmap_create_with_resource(RESOURCE_ID_CHARACTER_EVEN);
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s_character_odd = gbitmap_create_with_resource(RESOURCE_ID_CHARACTER_ODD);
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Layer *window_root_layer = window_get_root_layer(window);
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GRect window_bounds = layer_get_unobstructed_bounds(window_root_layer);
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s_character_layer =
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layer_create(GRect(0, window_bounds.size.h - CHARACTER_H, window_bounds.size.w, CHARACTER_H));
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layer_set_update_proc(s_character_layer, character_layer_update_proc);
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layer_add_child(window_root_layer, s_character_layer);
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}
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void character_layer_tick(void) {
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if (++s_character_ticks == 4) {
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s_character_ticks = 0;
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}
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layer_mark_dirty(s_character_layer);
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}
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void character_layer_deinit(void) {
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layer_destroy(s_character_layer);
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gbitmap_destroy(s_character_even);
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gbitmap_destroy(s_character_odd);
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}
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