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Modularise drawing code a little

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This commit is contained in:
a dinosaur
2022-11-15 05:10:26 +11:00
parent 2fa6be7780
commit 160defe951
4 changed files with 157 additions and 111 deletions
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1
CMakeLists.txt
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@ -4,6 +4,7 @@ set(CMAKE_C_STANDARD 99)
set(TARGET padlab)
set(SOURCES
maths.c maths.h
draw.c draw.h
analogue.c)
find_package(SDL2 REQUIRED)

188
analogue.c
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@ -1,4 +1,5 @@
#include "maths.h"
#include "draw.h"
#include <SDL.h>
#include <stdio.h>
#include <stdbool.h>
@ -10,7 +11,6 @@
#define DISPLAY_SCALE 0.8889
SDL_Window* window = NULL;
SDL_Renderer* rend = NULL;
SDL_JoystickID joyid = -1;
SDL_GameController* pad = NULL;
@ -26,26 +26,6 @@ bool UseGamepad(int a_joyid)
return false;
}
void DrawCircle(int x, int y, int r, int steps)
{
double stepsz = (TAU) / steps;
int lastx = r;
int lasty = 0;
for (int i = 0; i <= steps; ++i)
{
const double mag = (double)r;
int ofsx = (int)round(cos(stepsz * i) * mag);
int ofsy = (int)round(sin(stepsz * i) * mag);
SDL_RenderDrawLine(rend,
x + lastx, y + lasty,
x + ofsx, y + ofsy);
lastx = ofsx;
lasty = ofsy;
}
}
vector RadialDeadzone(vector v, double min, double max)
{
double mag = sqrt(v.x * v.x + v.y * v.y);
@ -145,28 +125,28 @@ void DrawAnalogue(const SDL_Rect* win, StickState* p)
p->recalc = false;
}
SDL_Rect rect;
double size = (double)(win->w > win->h ? win->h : win->w) * DISPLAY_SCALE;
// range rect
SDL_SetRenderDrawColor(rend, 0x3F, 0x3F, 0x3F, 0xFF);
rect.w = rect.h = (int)round(size);
rect.x = win->x + (win->w - rect.w) / 2;
rect.y = win->y + (win->h - rect.h) / 2;
SDL_RenderDrawRect(rend, &rect);
SetDrawColour(0x3F3F3FFF);
const int rectSz = (int)round(size);
DrawRect(
win->x + (win->w - rectSz) / 2,
win->y + (win->h - rectSz) / 2,
rectSz, rectSz);
const int ox = win->x + win->w / 2;
const int oy = win->y + win->h / 2;
// acceleration curve
SDL_SetRenderDrawColor(rend, 0x4F, 0x4F, 0x4F, 0xFF);
SetDrawColour(0x4F4F4FFF);
const int accelsamp = (int)(sqrt(size) * 4.20);
const double step = 1.0 / (double)accelsamp;
double y1 = AccelCurve(0.0, p->accelpow);
for (int i = 1; i <= accelsamp; ++i)
{
double y2 = AccelCurve(step * i, p->accelpow);
SDL_RenderDrawLine(rend,
DrawLine(
win->x + (int)(step * (i - 1) * size) + (win->w - (int)round(size)) / 2,
win->y + (int)((1.0 - y1) * size) + (win->h - (int)round(size)) / 2,
win->x + (int)(step * i * size) + (win->w - (int)round(size)) / 2,
@ -175,61 +155,53 @@ void DrawAnalogue(const SDL_Rect* win, StickState* p)
}
const int tickerx = (int)((p->preaccel - 0.5) * size);
const int tickery = (int)((0.5 - p->postacel) * size);
SDL_SetRenderDrawColor(rend, 0x2F, 0x3F, 0x1F, 0xFF);
SDL_RenderDrawLine(rend,
SetDrawColour(0x2F3F1FFF);
DrawLine(
ox + tickerx,
win->y + (win->h - (int)round(size)) / 2,
ox + tickerx,
win->y + (win->h + (int)round(size)) / 2);
SDL_SetRenderDrawColor(rend, 0x2F, 0x5F, 0x2F, 0xFF);
SDL_RenderDrawLine(rend,
SetDrawColour(0x2F5F2FFF);
DrawLine(
win->x + (win->w - (int)round(size)) / 2,
oy + tickery,
win->x + (win->w + (int)round(size)) / 2,
oy + tickery);
// guide circle
SDL_SetRenderDrawColor(rend, 0x4F, 0x4F, 0x4F, 0xFF);
DrawCircle(
ox, oy,
(int)round(size) / 2, (int)(sqrt(size) * 8.0));
SetDrawColour(0x4F4F4FFF);
DrawCircle(ox, oy, (int)round(size) / 2);
SDL_SetRenderDrawColor(rend, 0x3F, 0x3F, 0x3F, 0xFF);
DrawCircle(
ox, oy,
(int)round(p->deadzone * size) / 2, (int)(sqrt(size) * 2.0));
SetDrawColour(0x3F3F3FFF);
DrawCircle(ox, oy, (int)round(p->deadzone * size) / 2);
// 0,0 line axis'
SDL_SetRenderDrawColor(rend, 0x2F, 0x2F, 0x2F, 0xFF);
SDL_RenderDrawLine(rend,
win->x,
oy,
win->x + win->w,
oy);
SDL_RenderDrawLine(rend,
ox,
win->y,
ox,
win->y + win->h);
SetDrawColour(0x2F2F2FFF);
DrawLine(
win->x, oy,
win->x + win->w, oy);
DrawLine(
ox, win->y,
ox, win->y + win->h);
// compensated position
SDL_SetRenderDrawColor(rend, 0x1F, 0xFF, 0x1F, 0xFF);
DrawCircle(
SetDrawColour(0x1FFF1FFF);
DrawCircleSteps(
ox + (int)round(p->compos.x * size / 2.0),
oy + (int)round(p->compos.y * size / 2.0),
8, 16);
SDL_RenderDrawPoint(rend,
DrawPoint(
ox + (int)round(p->compos.x * size / 2.0),
oy + (int)round(p->compos.y * size / 2.0));
// raw position
SDL_SetRenderDrawColor(rend, 0xFF, 0xFF, 0xFF, 0xFF);
SDL_RenderDrawLine(rend,
SetDrawColour(0xFFFFFFFF);
DrawLine(
ox + (int)round(p->rawpos.x * size / 2.0) - 4,
oy + (int)round(p->rawpos.y * size / 2.0),
ox + (int)round(p->rawpos.x * size / 2.0) + 4,
oy + (int)round(p->rawpos.y * size / 2.0));
SDL_RenderDrawLine(rend,
DrawLine(
ox + (int)round(p->rawpos.x * size / 2.0),
oy + (int)round(p->rawpos.y * size / 2.0) - 4,
ox + (int)round(p->rawpos.x * size / 2.0),
@ -244,37 +216,32 @@ void DrawDigital(const SDL_Rect* win, StickState* p)
p->recalc = false;
}
SDL_Rect rect;
const double size = (double)(win->w > win->h ? win->h : win->w) * DISPLAY_SCALE;
// range rect
SDL_SetRenderDrawColor(rend, 0x3F, 0x3F, 0x3F, 0xFF);
rect.w = rect.h = (int)round(size);
rect.x = win->x + (win->w - rect.w) / 2;
rect.y = win->y + (win->h - rect.h) / 2;
SDL_RenderDrawRect(rend, &rect);
SetDrawColour(0x3F3F3FFF);
const int rectSz = (int)round(size);
DrawRect(
win->x + (win->w - rectSz) / 2,
win->y + (win->h - rectSz) / 2,
rectSz, rectSz);
// window centre
const int ox = win->x + win->w / 2;
const int oy = win->y + win->h / 2;
// guide circle
SDL_SetRenderDrawColor(rend, 0x4F, 0x4F, 0x4F, 0xFF);
DrawCircle(ox, oy,
(int)round(size) / 2, (int)(sqrt(size) * 8.0));
SetDrawColour(0x4F4F4FFF);
DrawCircle(ox, oy, (int)round(size) / 2);
// 0,0 line axis'
SDL_SetRenderDrawColor(rend, 0x2F, 0x2F, 0x2F, 0xFF);
SDL_RenderDrawLine(rend,
win->x,
oy,
win->x + win->w,
oy);
SDL_RenderDrawLine(rend,
ox,
win->y,
ox,
win->y + win->h);
SetDrawColour(0x2F2F2FFF);
DrawLine(
win->x, oy,
win->x + win->w, oy);
DrawLine(
ox, win->y,
ox, win->y + win->h);
// calcuate points for the zone previews
const double outerinvmag = 1.0 / sqrt(1.0 + p->digiangle * p->digiangle);
@ -283,47 +250,47 @@ void DrawDigital(const SDL_Rect* win, StickState* p)
const int innh = (int)round(p->digideadzone * size / 2.0);
const int innq = (int)round(p->digideadzone * size / 2.0 * p->digiangle);
SDL_SetRenderDrawColor(rend, 0x3F, 0x3F, 0x3F, 0xFF);
SetDrawColour(0x3F3F3FFF);
// angles preview
SDL_RenderDrawLine(rend, ox - outq, oy - outh, ox - innq, oy - innh);
SDL_RenderDrawLine(rend, ox + outq, oy - outh, ox + innq, oy - innh);
SDL_RenderDrawLine(rend, ox + outh, oy - outq, ox + innh, oy - innq);
SDL_RenderDrawLine(rend, ox + outh, oy + outq, ox + innh, oy + innq);
SDL_RenderDrawLine(rend, ox + outq, oy + outh, ox + innq, oy + innh);
SDL_RenderDrawLine(rend, ox - outq, oy + outh, ox - innq, oy + innh);
SDL_RenderDrawLine(rend, ox - outh, oy + outq, ox - innh, oy + innq);
SDL_RenderDrawLine(rend, ox - outh, oy - outq, ox - innh, oy - innq);
DrawLine(ox - outq, oy - outh, ox - innq, oy - innh);
DrawLine(ox + outq, oy - outh, ox + innq, oy - innh);
DrawLine(ox + outh, oy - outq, ox + innh, oy - innq);
DrawLine(ox + outh, oy + outq, ox + innh, oy + innq);
DrawLine(ox + outq, oy + outh, ox + innq, oy + innh);
DrawLine(ox - outq, oy + outh, ox - innq, oy + innh);
DrawLine(ox - outh, oy + outq, ox - innh, oy + innq);
DrawLine(ox - outh, oy - outq, ox - innh, oy - innq);
// deadzone octagon
SDL_RenderDrawLine(rend, ox - innq, oy - innh, ox + innq, oy - innh);
SDL_RenderDrawLine(rend, ox + innq, oy - innh, ox + innh, oy - innq);
SDL_RenderDrawLine(rend, ox + innh, oy - innq, ox + innh, oy - innq);
SDL_RenderDrawLine(rend, ox + innh, oy - innq, ox + innh, oy + innq);
SDL_RenderDrawLine(rend, ox + innh, oy + innq, ox + innq, oy + innh);
SDL_RenderDrawLine(rend, ox + innq, oy + innh, ox - innq, oy + innh);
SDL_RenderDrawLine(rend, ox - innq, oy + innh, ox - innh, oy + innq);
SDL_RenderDrawLine(rend, ox - innh, oy + innq, ox - innh, oy - innq);
SDL_RenderDrawLine(rend, ox - innh, oy - innq, ox - innq, oy - innh);
DrawLine(ox - innq, oy - innh, ox + innq, oy - innh);
DrawLine(ox + innq, oy - innh, ox + innh, oy - innq);
DrawLine(ox + innh, oy - innq, ox + innh, oy - innq);
DrawLine(ox + innh, oy - innq, ox + innh, oy + innq);
DrawLine(ox + innh, oy + innq, ox + innq, oy + innh);
DrawLine(ox + innq, oy + innh, ox - innq, oy + innh);
DrawLine(ox - innq, oy + innh, ox - innh, oy + innq);
DrawLine(ox - innh, oy + innq, ox - innh, oy - innq);
DrawLine(ox - innh, oy - innq, ox - innq, oy - innh);
// compensated position
SDL_SetRenderDrawColor(rend, 0x1F, 0xFF, 0x1F, 0xFF);
DrawCircle(
SetDrawColour(0x1FFF1FFF);
DrawCircleSteps(
ox + (int)round(p->compos.x * size / 2.0),
oy + (int)round(p->compos.y * size / 2.0),
8, 16);
SDL_RenderDrawPoint(rend,
DrawPoint(
ox + (int)round(p->compos.x * size / 2.0),
oy + (int)round(p->compos.y * size / 2.0));
// raw position
SDL_SetRenderDrawColor(rend, 0xFF, 0xFF, 0xFF, 0xFF);
SDL_RenderDrawLine(rend,
SetDrawColour(0xFFFFFFFF);
DrawLine(
ox + (int)round(p->rawpos.x * size / 2.0) - 4,
oy + (int)round(p->rawpos.y * size / 2.0),
ox + (int)round(p->rawpos.x * size / 2.0) + 4,
oy + (int)round(p->rawpos.y * size / 2.0));
SDL_RenderDrawLine(rend,
DrawLine(
ox + (int)round(p->rawpos.x * size / 2.0),
oy + (int)round(p->rawpos.y * size / 2.0) - 4,
ox + (int)round(p->rawpos.x * size / 2.0),
@ -533,8 +500,8 @@ int main(int argc, char** argv)
if (repaint)
{
// background
SDL_SetRenderDrawColor(rend, 0x1F, 0x1F, 0x1F, 0xFF);
SDL_RenderClear(rend);
SetDrawColour(0x1F1F1FFF);
DrawClear();
const int hrw = rw / 2;
DrawDigital(&(SDL_Rect){ 0, 0, hrw, rh }, &stickl);
@ -543,17 +510,16 @@ int main(int argc, char** argv)
// test player thingo
if (showavatar)
{
SDL_Rect rect;
plrpos = VecAdd(plrpos, VecScale(stickl.compos, framedelta * 0.5));
plrpos.x = pfmod(plrpos.x, rw);
plrpos.y = pfmod(plrpos.y, rh);
SDL_SetRenderDrawColor(rend, 0xFF, 0x00, 0x00, 0xFF);
rect.w = rect.h = 32;
rect.x = (int)plrpos.x - rect.w / 2;
rect.y = (int)plrpos.y - rect.h / 2;
SDL_RenderDrawRect(rend, &rect);
SetDrawColour(0xFF0000FF);
const int plrSz = 32;
DrawRect(
(int)plrpos.x - plrSz / 2,
(int)plrpos.y - plrSz / 2,
plrSz, plrSz);
}
SDL_RenderPresent(rend);

62
draw.c Normal file
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@ -0,0 +1,62 @@
#include "draw.h"
#include "maths.h"
#include <SDL_render.h>
SDL_Renderer* rend = NULL;
void SetDrawColour(uint32_t c)
{
SDL_SetRenderDrawColor(rend,
(c & 0xFF000000) >> 24,
(c & 0x00FF0000) >> 16,
(c & 0x0000FF00) >> 8,
(c & 0x000000FF));
}
void DrawClear(void)
{
SDL_RenderClear(rend);
}
void DrawPoint(int x, int y)
{
SDL_RenderDrawPoint(rend, x, y);
}
void DrawRect(int x, int y, int w, int h)
{
SDL_Rect dst = {
.x = x, .y = y,
.w = w, .h = h };
SDL_RenderDrawRect(rend, &dst);
}
void DrawLine(int x1, int y1, int x2, int y2)
{
SDL_RenderDrawLine(rend, x1, y1, x2, y2);
}
void DrawCircle(int x, int y, int r)
{
DrawCircleSteps(x, y, r, (int)(sqrt((double)r) * 8.0));
}
void DrawCircleSteps(int x, int y, int r, int steps)
{
double stepsz = (double)TAU / steps;
int lastx = r;
int lasty = 0;
for (int i = 0; i <= steps; ++i)
{
const double mag = (double)r;
int ofsx = (int)round(cos(stepsz * i) * mag);
int ofsy = (int)round(sin(stepsz * i) * mag);
SDL_RenderDrawLine(rend,
x + lastx, y + lasty,
x + ofsx, y + ofsy);
lastx = ofsx;
lasty = ofsy;
}
}

17
draw.h Normal file
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@ -0,0 +1,17 @@
#ifndef DRAW_H
#define DRAW_H
#include <stdint.h>
typedef struct SDL_Renderer SDL_Renderer;
extern SDL_Renderer* rend;
void SetDrawColour(uint32_t c);
void DrawClear(void);
void DrawPoint(int x, int y);
void DrawRect(int x, int y, int w, int h);
void DrawLine(int x1, int y1, int x2, int y2);
void DrawCircle(int x, int y, int r);
void DrawCircleSteps(int x, int y, int r, int steps);
#endif//DRAW_H