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#include <nds.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
struct vec2d {
float x;
float y;
};
struct player {
struct vec2d pos;
struct vec2d delta;
float max_vel;
float accel;
int w;
int h;
};
void init_player(struct player *p, float x, float y, float max_vel, float accel, int w, int h) {
p->pos.x = x;
p->pos.y = y;
p->delta.x = 0;
p->delta.y = 0;
p->max_vel = max_vel;
p->accel = accel;
p->w = w;
p->h = h;
}
int main() {
touchPosition old_touch;
touchPosition touch;
memset(&old_touch, 0, sizeof(old_touch));
memset(&touch, 0, sizeof(touch));
videoSetMode(MODE_0_2D);
videoSetModeSub(MODE_0_2D);
vramSetBankC(VRAM_C_MAIN_BG);
vramSetBankD(VRAM_D_SUB_SPRITE);
oamInit(&oamSub, SpriteMapping_1D_32, false);
u16 *sub_gfx = oamAllocateGfx(&oamSub, SpriteSize_16x16, SpriteColorFormat_256Color);
videoSetMode(MODE_0_2D);
for (int i = 0; i < (16*16)/2; i++) {
sub_gfx[i] = 1 | BIT(8);
}
SPRITE_PALETTE_SUB[1] = RGB15(0,31,0);
consoleInit(0, 0, BgType_Text4bpp, BgSize_T_256x256, 31, 0, true, true);
struct player ply;
struct vec2d drag_speed = {0, 0};
int max_x = 256;
int min_x = 0;
int max_y = 192;
int min_y = 0;
int frame_step = 0;
int pause = 0;
init_player(&ply, 100, 100, 5.25f, 0.25f, 16, 16);
min_x -= ply.w;
min_y -= ply.h;
for (;;) {
scanKeys();
int pressed = keysDown();
int held = keysHeld();
frame_step = (pressed & KEY_R) ? !frame_step : frame_step;
pause = (pressed & KEY_SELECT) ? !pause : pause;
frame_step = (pressed & KEY_SELECT) ? 0 : frame_step;
pause = (frame_step) ? 1 : pause;
if (!pause || frame_step) {
int up = held & KEY_UP;
int down = held & KEY_DOWN;
int left = held & KEY_LEFT;
int right = held & KEY_RIGHT;
int is_decel_x = (!left && ply.delta.x < 0) || (!right && ply.delta.x > 0);
int is_decel_y = (!up && ply.delta.y < 0) || (!down && ply.delta.y > 0);
if (held & KEY_TOUCH) {
touchRead(&touch);
touch.px = (touch.px >= max_x+ply.w) ? max_x+ply.w : touch.px;
touch.py = (touch.py >= max_y+ply.h) ? max_y+ply.h : touch.py;
drag_speed.x = (touch.px - old_touch.px)/2;
drag_speed.y = (touch.py - old_touch.py)/2;
ply.delta = drag_speed;
ply.pos.x = touch.px;
ply.pos.y = touch.py;
old_touch = touch;
}
if (is_decel_x) {
int opposite_x = (right && ply.delta.x < 0) || (left && ply.delta.x > 0);
float tmp_accel = ply.accel*(opposite_x+1);
ply.delta.x += (ply.delta.x > 0) ? -tmp_accel : tmp_accel;
} else if (left || right) {
ply.delta.x += (right) ? ply.accel : -ply.accel;
}
if (is_decel_y) {
int opposite_y = (down && ply.delta.y < 0) || (up && ply.delta.y > 0);
float tmp_accel = ply.accel*(opposite_y+1);
ply.delta.y += (ply.delta.y > 0) ? -tmp_accel : tmp_accel;
} else if (up || down) {
ply.delta.y += (down) ? ply.accel : -ply.accel;
}
ply.delta.x = (ply.delta.x > ply.max_vel) ? ply.max_vel : ply.delta.x;
ply.delta.y = (ply.delta.y > ply.max_vel) ? ply.max_vel : ply.delta.y;
ply.delta.x = (ply.delta.x < -ply.max_vel) ? -ply.max_vel : ply.delta.x;
ply.delta.y = (ply.delta.y < -ply.max_vel) ? -ply.max_vel : ply.delta.y;
ply.pos.x += ply.delta.x;
ply.pos.y += ply.delta.y;
ply.pos.x = (ply.pos.x > max_x) ? min_x+(ply.delta.x-1) : ply.pos.x;
ply.pos.y = (ply.pos.y > max_y) ? min_y+(ply.delta.y-1) : ply.pos.y;
ply.pos.x = (ply.pos.x < min_x) ? max_x+(ply.delta.x+1) : ply.pos.x;
ply.pos.y = (ply.pos.y < min_y) ? max_y+(ply.delta.y+1) : ply.pos.y;
frame_step = 0;
}
if (held & KEY_START) {
break;
}
oamSet(&oamSub, 0, (int)ply.pos.x, (int)ply.pos.y, 0, 0, SpriteSize_16x16, SpriteColorFormat_256Color, sub_gfx, -1, false, false, false, false, false);
swiWaitForVBlank();
printf("\x1B[5Hx: % 4.5f, y: % 4.5f\n", ply.pos.x, ply.pos.y);
printf("dx: % 3.5f, dy: % 3.5f\n", ply.delta.x, ply.delta.y);
iprintf("pause: %i, frame_step: %i\n", pause, frame_step);
oamUpdate(&oamSub);
}
return 0;
}
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