1
0
mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00
v/vlib/gg/gg.v

760 lines
19 KiB
V
Raw Normal View History

// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
2020-07-06 21:29:05 +03:00
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
2019-06-22 21:20:28 +03:00
module gg
import gx
import sokol.sapp
import sokol.sgl
import sokol.gfx
2020-10-10 11:37:17 +03:00
import math
2019-06-22 21:20:28 +03:00
pub type FNCb = fn (data voidptr)
pub type FNEvent = fn (e &Event, data voidptr)
pub type FNFail = fn (msg string, data voidptr)
2020-08-02 00:40:25 +03:00
pub type FNKeyDown = fn (c KeyCode, m Modifier, data voidptr)
2020-08-02 00:40:25 +03:00
pub type FNKeyUp = fn (c KeyCode, m Modifier, data voidptr)
2020-08-02 00:40:25 +03:00
pub type FNMove = fn (x f32, y f32, data voidptr)
2020-08-02 00:40:25 +03:00
pub type FNClick = fn (x f32, y f32, button MouseButton, data voidptr)
2020-09-21 03:42:28 +03:00
pub type FNUnClick = fn (x f32, y f32, button MouseButton, data voidptr)
pub type FNChar = fn (c u32, data voidptr)
2019-06-22 21:20:28 +03:00
pub struct Config {
2019-08-23 00:00:31 +03:00
pub:
width int
height int
use_ortho bool // unused, still here just for backwards compatibility
retina bool
resizable bool
user_data voidptr
font_size int
create_window bool
// window_user_ptr voidptr
window_title string
borderless_window bool
always_on_top bool
bg_color gx.Color
init_fn FNCb = voidptr(0)
frame_fn FNCb = voidptr(0)
native_frame_fn FNCb = voidptr(0)
cleanup_fn FNCb = voidptr(0)
fail_fn FNFail = voidptr(0)
//
event_fn FNEvent = voidptr(0)
quit_fn FNEvent = voidptr(0)
//
keydown_fn FNKeyDown = voidptr(0)
keyup_fn FNKeyUp = voidptr(0)
char_fn FNChar = voidptr(0)
//
move_fn FNMove = voidptr(0)
click_fn FNClick = voidptr(0)
unclick_fn FNUnClick = voidptr(0)
leave_fn FNEvent = voidptr(0)
enter_fn FNEvent = voidptr(0)
resized_fn FNEvent = voidptr(0)
scroll_fn FNEvent = voidptr(0)
2020-11-21 02:04:29 +03:00
// wait_events bool // set this to true for UIs, to save power
fullscreen bool
scale f32 = 1.0
sample_count int
swap_interval int = 1 // 1 = 60fps, 2 = 30fps etc. The preferred swap interval (ignored on some platforms)
// ved needs this
2020-08-02 00:40:25 +03:00
// init_text bool
2020-12-01 18:30:22 +03:00
font_path string
custom_bold_font_path string
ui_mode bool // refreshes only on events to save CPU usage
// font bytes for embedding
font_bytes_normal []byte
font_bytes_bold []byte
font_bytes_mono []byte
font_bytes_italic []byte
2021-01-23 12:25:40 +03:00
native_rendering bool // Cocoa on macOS/iOS, GDI+ on Windows
// drag&drop
enable_dragndrop bool // enable file dropping (drag'n'drop), default is false
max_dropped_files int = 1 // max number of dropped files to process (default: 1)
max_dropped_file_path_length int = 2048 // max length in bytes of a dropped UTF-8 file path (default: 2048)
2019-06-22 21:20:28 +03:00
}
pub struct PenConfig {
color gx.Color
line_type PenLineType = .solid
thickness int = 1
}
2020-08-02 00:40:25 +03:00
pub struct Size {
pub:
width int
height int
}
2020-06-04 20:57:13 +03:00
fn gg_frame_fn(user_data voidptr) {
mut ctx := unsafe { &Context(user_data) }
ctx.frame++
if ctx.config.frame_fn == voidptr(0) {
return
}
2021-01-23 12:25:40 +03:00
if ctx.native_rendering {
// return
}
if ctx.ui_mode && !ctx.needs_refresh {
// Draw 3 more frames after the "stop refresh" command
ctx.ticks++
if ctx.ticks > 3 {
return
}
2019-08-23 00:00:31 +03:00
}
ctx.config.frame_fn(ctx.config.user_data)
ctx.needs_refresh = false
}
pub fn (mut ctx Context) refresh_ui() {
ctx.needs_refresh = true
ctx.ticks = 0
2019-08-23 00:00:31 +03:00
}
2020-08-02 00:40:25 +03:00
fn gg_event_fn(ce &C.sapp_event, user_data voidptr) {
// e := unsafe { &sapp.Event(ce) }
mut e := unsafe { &Event(ce) }
mut g := unsafe { &Context(user_data) }
2021-03-27 13:03:15 +03:00
if g.ui_mode {
g.refresh_ui()
}
if e.typ == .mouse_down {
bitplace := int(e.mouse_button)
g.mbtn_mask |= byte(1 << bitplace)
g.mouse_buttons = MouseButtons(g.mbtn_mask)
}
if e.typ == .mouse_up {
bitplace := int(e.mouse_button)
g.mbtn_mask &= ~(byte(1 << bitplace))
g.mouse_buttons = MouseButtons(g.mbtn_mask)
}
if e.typ == .mouse_move && e.mouse_button == .invalid {
if g.mbtn_mask & 0x01 > 0 {
e.mouse_button = .left
}
if g.mbtn_mask & 0x02 > 0 {
e.mouse_button = .right
}
if g.mbtn_mask & 0x04 > 0 {
e.mouse_button = .middle
}
}
g.mouse_pos_x = int(e.mouse_x / g.scale)
g.mouse_pos_y = int(e.mouse_y / g.scale)
g.mouse_dx = int(e.mouse_dx / g.scale)
g.mouse_dy = int(e.mouse_dy / g.scale)
g.scroll_x = int(e.scroll_x / g.scale)
g.scroll_y = int(e.scroll_y / g.scale)
g.key_modifiers = Modifier(e.modifiers)
g.key_repeat = e.key_repeat
if e.typ in [.key_down, .key_up] {
key_idx := int(e.key_code) % key_code_max
prev := g.pressed_keys[key_idx]
next := e.typ == .key_down
g.pressed_keys[key_idx] = next
g.pressed_keys_edge[key_idx] = prev != next
}
if g.config.event_fn != voidptr(0) {
g.config.event_fn(e, g.config.user_data)
2019-08-23 00:00:31 +03:00
}
match e.typ {
.mouse_move {
if g.config.move_fn != voidptr(0) {
g.config.move_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, g.config.user_data)
}
}
.mouse_down {
if g.config.click_fn != voidptr(0) {
g.config.click_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, e.mouse_button,
g.config.user_data)
}
}
.mouse_up {
if g.config.unclick_fn != voidptr(0) {
g.config.unclick_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, e.mouse_button,
g.config.user_data)
}
}
.mouse_leave {
if g.config.leave_fn != voidptr(0) {
g.config.leave_fn(e, g.config.user_data)
}
}
.mouse_enter {
if g.config.enter_fn != voidptr(0) {
g.config.enter_fn(e, g.config.user_data)
}
}
.mouse_scroll {
if g.config.scroll_fn != voidptr(0) {
g.config.scroll_fn(e, g.config.user_data)
}
}
.key_down {
if g.config.keydown_fn != voidptr(0) {
g.config.keydown_fn(e.key_code, Modifier(e.modifiers), g.config.user_data)
}
}
.key_up {
if g.config.keyup_fn != voidptr(0) {
g.config.keyup_fn(e.key_code, Modifier(e.modifiers), g.config.user_data)
}
}
.char {
if g.config.char_fn != voidptr(0) {
g.config.char_fn(e.char_code, g.config.user_data)
}
}
.resized {
if g.config.resized_fn != voidptr(0) {
g.config.resized_fn(e, g.config.user_data)
2020-09-21 03:42:28 +03:00
}
}
.quit_requested {
if g.config.quit_fn != voidptr(0) {
g.config.quit_fn(e, g.config.user_data)
2020-09-21 03:42:28 +03:00
}
}
else {
// dump(e)
}
}
2019-06-22 21:20:28 +03:00
}
2020-08-02 00:40:25 +03:00
fn gg_cleanup_fn(user_data voidptr) {
mut g := unsafe { &Context(user_data) }
if g.config.cleanup_fn != voidptr(0) {
g.config.cleanup_fn(g.config.user_data)
2019-06-22 21:20:28 +03:00
}
}
2021-04-04 18:05:01 +03:00
fn gg_fail_fn(msg &char, user_data voidptr) {
mut g := unsafe { &Context(user_data) }
vmsg := unsafe { tos3(msg) }
if g.config.fail_fn != voidptr(0) {
g.config.fail_fn(vmsg, g.config.user_data)
2020-08-02 00:40:25 +03:00
} else {
eprintln('gg error: $vmsg')
}
2019-06-22 21:20:28 +03:00
}
2020-06-04 21:26:18 +03:00
pub fn (gg &Context) run() {
sapp.run(&gg.window)
2019-06-22 21:20:28 +03:00
}
2021-05-27 17:56:18 +03:00
// quit closes the context window and exits the event loop for it
pub fn (ctx &Context) quit() {
sapp.request_quit() // does not require ctx right now, but sokol multi-window might in the future
}
2020-08-19 08:10:42 +03:00
pub fn (mut ctx Context) set_bg_color(c gx.Color) {
2020-10-10 11:37:17 +03:00
ctx.clear_pass = gfx.create_clear_pass(f32(c.r) / 255.0, f32(c.g) / 255.0, f32(c.b) / 255.0,
f32(c.a) / 255.0)
2020-08-19 08:10:42 +03:00
}
[inline]
pub fn (ctx &Context) draw_square(x f32, y f32, s f32, c gx.Color) {
ctx.draw_rect(x, y, s, s, c)
}
[inline]
pub fn (ctx &Context) set_pixel(x f32, y f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_points()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.end()
}
[direct_array_access; inline]
2021-08-20 01:14:25 +03:00
pub fn (ctx &Context) set_pixels(points []f32, c gx.Color) {
assert points.len % 2 == 0
len := points.len / 2
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_points()
2021-08-20 01:14:25 +03:00
for i in 0 .. len {
x, y := points[i * 2], points[i * 2 + 1]
sgl.v2f(x * ctx.scale, y * ctx.scale)
}
sgl.end()
}
pub fn (ctx &Context) draw_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_triangles()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
sgl.v2f(x3 * ctx.scale, y3 * ctx.scale)
sgl.end()
}
pub fn (ctx &Context) draw_empty_rect(x f32, y f32, w f32, h f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
2020-08-19 08:10:42 +03:00
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
2021-05-28 22:37:02 +03:00
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
2021-08-16 06:36:19 +03:00
sgl.v2f(x * ctx.scale, (y - 1) * ctx.scale)
sgl.end()
}
[inline]
pub fn (ctx &Context) draw_empty_square(x f32, y f32, s f32, c gx.Color) {
ctx.draw_empty_rect(x, y, s, s, c)
}
pub fn (ctx &Context) draw_circle(x f32, y f32, r f32, c gx.Color) {
2021-05-28 22:37:02 +03:00
ctx.draw_circle_with_segments(x, y, r, 10, c)
2020-10-18 22:22:37 +03:00
}
2020-11-15 17:11:43 +03:00
pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, r f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
2021-05-28 22:37:02 +03:00
nx := x * ctx.scale
ny := y * ctx.scale
nr := r * ctx.scale
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_triangle_strip()
2020-10-10 11:37:17 +03:00
for i := 0; i < segments + 1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
2021-05-28 22:37:02 +03:00
xx = nr * math.cosf(theta)
yy = nr * math.sinf(theta)
sgl.v2f(xx + nx, yy + ny)
sgl.v2f(nx, ny)
}
sgl.end()
}
pub fn (ctx &Context) draw_arc_line(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
2021-05-28 22:37:02 +03:00
nx := x * ctx.scale
ny := y * ctx.scale
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_line_strip()
2020-10-10 11:37:17 +03:00
for i := 0; i < segments + 1; i++ {
2021-05-28 22:37:02 +03:00
sgl.v2f(xx + nx, yy + ny)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
}
pub fn (ctx &Context) draw_arc(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
2021-05-28 22:37:02 +03:00
nx := x * ctx.scale
ny := y * ctx.scale
theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_triangle_strip()
2020-10-10 11:37:17 +03:00
for i := 0; i < segments + 1; i++ {
2021-05-28 22:37:02 +03:00
sgl.v2f(xx + nx, yy + ny)
sgl.v2f(nx, ny)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
2020-07-13 02:02:47 +03:00
}
2020-06-04 21:26:18 +03:00
pub fn (gg &Context) begin() {
2020-07-06 20:45:00 +03:00
if gg.render_text && gg.font_inited {
gg.ft.flush()
}
sgl.defaults()
sgl.matrix_mode_projection()
sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
2020-01-27 22:42:32 +03:00
}
2020-06-04 21:26:18 +03:00
pub fn (gg &Context) end() {
gfx.begin_default_pass(gg.clear_pass, sapp.width(), sapp.height())
sgl.draw()
gfx.end_pass()
gfx.commit()
2020-11-21 01:49:52 +03:00
/*
if gg.config.wait_events {
2020-08-02 00:40:25 +03:00
// println('gg: waiting')
wait_events()
}
2020-11-21 01:49:52 +03:00
*/
2019-06-22 21:20:28 +03:00
}
// resize the context's Window
2021-01-25 00:27:27 +03:00
pub fn (mut ctx Context) resize(width int, height int) {
ctx.width = width
ctx.height = height
}
// draw_line draws a line between the points provided
pub fn (ctx &Context) draw_line(x f32, y f32, x2 f32, y2 f32, c gx.Color) {
$if macos {
if ctx.native_rendering {
// Make the line more clear on hi dpi screens: draw a rectangle
mut width := math.abs(x2 - x)
mut height := math.abs(y2 - y)
if width == 0 {
width = 1
} else if height == 0 {
height = 1
}
ctx.draw_rect(x, y, f32(width), f32(height), c)
return
}
}
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
2021-06-21 20:30:03 +03:00
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
sgl.end()
}
// draw_line_with_config draws a line between the points provided with the PenConfig
pub fn (ctx &Context) draw_line_with_config(x f32, y f32, x2 f32, y2 f32, config PenConfig) {
if config.color.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
if config.thickness <= 0 {
return
}
nx := x * ctx.scale
ny := y * ctx.scale
nx2 := x2 * ctx.scale
ny2 := y2 * ctx.scale
dx := nx2 - nx
dy := ny2 - ny
length := math.sqrtf(math.powf(x2 - x, 2) + math.powf(y2 - y, 2))
theta := f32(math.atan2(dy, dx))
sgl.push_matrix()
sgl.translate(nx, ny, 0)
sgl.rotate(theta, 0, 0, 1)
sgl.translate(-nx, -ny, 0)
if config.line_type == .solid {
ctx.draw_rect(x, y, length, config.thickness, config.color)
} else {
size := if config.line_type == .dotted { config.thickness } else { config.thickness * 3 }
space := if size == 1 { 2 } else { size }
mut available := length
mut start_x := x
for i := 0; available > 0; i++ {
if i % 2 == 0 {
ctx.draw_rect(start_x, y, size, config.thickness, config.color)
available -= size
start_x += size
continue
2021-04-26 10:01:55 +03:00
}
available -= space
start_x += space
2020-08-23 05:57:12 +03:00
}
}
sgl.pop_matrix()
2020-08-02 00:40:25 +03:00
}
2020-11-22 22:13:40 +03:00
pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, w f32, h f32, radius f32, color gx.Color) {
sgl.c4b(color.r, color.g, color.b, color.a)
sgl.begin_triangle_strip()
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
2021-05-28 22:37:02 +03:00
r := radius * ctx.scale
nx := x * ctx.scale
ny := y * ctx.scale
width := w * ctx.scale
height := h * ctx.scale
2020-11-22 22:13:40 +03:00
segments := 2 * math.pi * r
segdiv := segments / 4
rb := 0
lb := int(rb + segdiv)
lt := int(lb + segdiv)
rt := int(lt + segdiv)
// left top
lx := nx + r
ly := ny + r
for i in lt .. rt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lx, yy + ly)
sgl.v2f(lx, ly)
}
// right top
mut rx := nx + width - r
2020-11-22 22:13:40 +03:00
mut ry := ny + r
for i in rt .. int(segments) {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rx, yy + ry)
sgl.v2f(rx, ry)
}
// right bottom
mut rbx := rx
mut rby := ny + height - r
2020-11-22 22:13:40 +03:00
for i in rb .. lb {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rbx, yy + rby)
sgl.v2f(rbx, rby)
}
// left bottom
mut lbx := lx
mut lby := ny + height - r
2020-11-22 22:13:40 +03:00
for i in lb .. lt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lbx, yy + lby)
sgl.v2f(lbx, lby)
}
sgl.v2f(lx + xx, ly)
sgl.v2f(lx, ly)
sgl.end()
sgl.begin_quads()
sgl.v2f(lx, ly)
sgl.v2f(rx, ry)
sgl.v2f(rbx, rby)
sgl.v2f(lbx, lby)
sgl.end()
2020-07-06 20:45:00 +03:00
}
pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, w f32, h f32, radius f32, border_color gx.Color) {
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
2021-05-28 22:37:02 +03:00
r := radius * ctx.scale
nx := x * ctx.scale
ny := y * ctx.scale
width := w * ctx.scale
height := h * ctx.scale
segments := 2 * math.pi * r
segdiv := segments / 4
rb := 0
lb := int(rb + segdiv)
lt := int(lb + segdiv)
rt := int(lt + segdiv)
sgl.c4b(border_color.r, border_color.g, border_color.b, border_color.a)
sgl.begin_line_strip()
// left top
lx := nx + r
ly := ny + r
for i in lt .. rt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lx, yy + ly)
}
// right top
mut rx := nx + width - r
mut ry := ny + r
for i in rt .. int(segments) {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rx, yy + ry)
}
// right bottom
mut rbx := rx
mut rby := ny + height - r
for i in rb .. lb {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rbx, yy + rby)
}
// left bottom
mut lbx := lx
mut lby := ny + height - r
for i in lb .. lt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lbx, yy + lby)
}
sgl.v2f(lx + xx, ly)
sgl.end()
}
// draw_convex_poly draws a convex polygon, given an array of points, and a color.
// Note that the points must be given in clockwise order.
pub fn (ctx &Context) draw_convex_poly(points []f32, c gx.Color) {
assert points.len % 2 == 0
len := points.len / 2
assert len >= 3
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_triangle_strip()
x0 := points[0] * ctx.scale
y0 := points[1] * ctx.scale
for i in 1 .. (len / 2 + 1) {
sgl.v2f(x0, y0)
sgl.v2f(points[i * 4 - 2] * ctx.scale, points[i * 4 - 1] * ctx.scale)
sgl.v2f(points[i * 4] * ctx.scale, points[i * 4 + 1] * ctx.scale)
}
if len % 2 == 0 {
sgl.v2f(points[2 * len - 2] * ctx.scale, points[2 * len - 1] * ctx.scale)
}
sgl.end()
}
// draw_empty_poly - draws the borders of a polygon, given an array of points, and a color.
// Note that the points must be given in clockwise order.
pub fn (ctx &Context) draw_empty_poly(points []f32, c gx.Color) {
assert points.len % 2 == 0
len := points.len / 2
assert len >= 3
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
for i in 0 .. len {
sgl.v2f(points[2 * i] * ctx.scale, points[2 * i + 1] * ctx.scale)
}
sgl.v2f(points[0] * ctx.scale, points[1] * ctx.scale)
sgl.end()
}
// draw_cubic_bezier draws a cubic Bézier curve, also known as a spline, from four points.
// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
// Please see `draw_cubic_bezier_in_steps` to control the amount of steps (segments) used to draw the curve.
pub fn (ctx &Context) draw_cubic_bezier(points []f32, c gx.Color) {
ctx.draw_cubic_bezier_in_steps(points, u32(30 * ctx.scale), c)
}
// draw_cubic_bezier_in_steps draws a cubic Bézier curve, also known as a spline, from four points.
// The smoothness of the curve can be controlled with the `steps` parameter. `steps` determines how many iterations is
// taken to draw the curve.
// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
pub fn (ctx &Context) draw_cubic_bezier_in_steps(points []f32, steps u32, c gx.Color) {
assert steps > 0
assert points.len == 8
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
p1_x, p1_y := points[0], points[1]
p2_x, p2_y := points[6], points[7]
ctrl_p1_x, ctrl_p1_y := points[2], points[3]
ctrl_p2_x, ctrl_p2_y := points[4], points[5]
// The constant 3 is actually points.len() - 1;
step := f32(1.0) / steps
sgl.v2f(p1_x * ctx.scale, p1_y * ctx.scale)
for u := f32(0.0); u <= f32(1.0); u += step {
pow_2_u := u * u
pow_3_u := pow_2_u * u
x := pow_3_u * (p2_x + 3 * (ctrl_p1_x - ctrl_p2_x) - p1_x) +
3 * pow_2_u * (p1_x - 2 * ctrl_p1_x + ctrl_p2_x) + 3 * u * (ctrl_p1_x - p1_x) + p1_x
y := pow_3_u * (p2_y + 3 * (ctrl_p1_y - ctrl_p2_y) - p1_y) +
3 * pow_2_u * (p1_y - 2 * ctrl_p1_y + ctrl_p2_y) + 3 * u * (ctrl_p1_y - p1_y) + p1_y
sgl.v2f(x * ctx.scale, y * ctx.scale)
}
sgl.v2f(p2_x * ctx.scale, p2_y * ctx.scale)
sgl.end()
}
2021-01-29 13:11:03 +03:00
// window_size returns the `Size` of the active window
pub fn window_size() Size {
s := dpi_scale()
return Size{int(sapp.width() / s), int(sapp.height() / s)}
2021-01-29 13:11:03 +03:00
}
// window_size_real_pixels returns the `Size` of the active window without scale
pub fn window_size_real_pixels() Size {
return Size{sapp.width(), sapp.height()}
}
pub fn dpi_scale() f32 {
mut s := sapp.dpi_scale()
$if android {
s *= android_dpi_scale()
}
// NB: on older X11, `Xft.dpi` from ~/.Xresources, that sokol uses,
// may not be set which leads to sapp.dpi_scale reporting incorrectly 0.0
if s < 0.1 {
s = 1.0
}
return s
}