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|
module ttf
/**********************************************************************
*
* BMP render module utility functions
*
* Copyright (c) 2021 Dario Deledda. All rights reserved.
* Use of this source code is governed by an MIT license
* that can be found in the LICENSE file.
*
* Note:
*
* TODO:
**********************************************************************/
pub struct Text_block {
x int // x postion of the left high corner
y int // y postion of the left high corner
w int // width of the text block
h int // heigth of the text block
cut_lines bool = true // force to cut the line if the length is over the text block width
}
fn (mut dev BitMap) get_justify_space_cw(txt string, w int, block_w int, space_cw int) f32 {
num_spaces := txt.count(' ')
if num_spaces < 1 {
return 0
}
delta := block_w - w
// println("num spc: $num_spaces")
// println("delta: ${txt} w:$w bw:$block_w space_cw:$space_cw")
res := f32(delta) / f32(num_spaces) / f32(space_cw)
// println("res: $res")
return res
}
// write out a text
pub fn (mut bmp BitMap) draw_text_block(text string, block Text_block) {
mut x := block.x
mut y := block.y
mut y_base := int((bmp.tf.y_max - bmp.tf.y_min) * bmp.scale)
// bmp.box(x, y, x + block.w, y + block.h, u32(0xFF00_0000))
// spaces data
mut space_cw, _ := bmp.tf.get_horizontal_metrics(u16(` `))
space_cw = int(space_cw * bmp.scale)
old_space_cw := bmp.space_cw
mut offset_flag := f32(0) // default .left align
if bmp.align == .right {
offset_flag = 1
} else if bmp.align == .center {
offset_flag = 0.5
}
for txt in text.split_into_lines() {
bmp.space_cw = old_space_cw
mut w, _ := bmp.get_bbox(txt)
if w <= block.w || block.cut_lines == false {
// println("Solid block!")
left_offset := int((block.w - w) * offset_flag)
if bmp.justify && (f32(w) / f32(block.w)) >= bmp.justify_fill_ratio {
bmp.space_cw = old_space_cw + bmp.get_justify_space_cw(txt, w, block.w, space_cw)
}
bmp.set_pos(x + left_offset, y + y_base)
bmp.draw_text(txt)
//---- DEBUG ----
// mut txt_w , mut txt_h := bmp.draw_text(txt)
// bmp.box(x + left_offset,y+y_base - int((bmp.tf.y_min)*bmp.scale), x + txt_w + left_offset, y + y_base - int((bmp.tf.y_max) * bmp.scale), u32(0x00ff_0000) )
//---------------
y += y_base
} else {
// println("to cut: ${txt}")
mut txt1 := txt.split(' ')
mut c := txt1.len
// mut done := false
for c > 0 {
tmp_str := txt1[0..c].join(' ')
// println("tmp_str: ${tmp_str}")
if tmp_str.len < 1 {
break
}
bmp.space_cw = old_space_cw
w, _ = bmp.get_bbox(tmp_str)
if w <= block.w {
mut left_offset := int((block.w - w) * offset_flag)
if bmp.justify && (f32(w) / f32(block.w)) >= bmp.justify_fill_ratio {
// println("cut phase!")
bmp.space_cw = 0.0
w, _ = bmp.get_bbox(tmp_str)
left_offset = int((block.w - w) * offset_flag)
bmp.space_cw = bmp.get_justify_space_cw(tmp_str, w, block.w, space_cw)
} else {
bmp.space_cw = old_space_cw
}
bmp.set_pos(x + left_offset, y + y_base)
bmp.draw_text(tmp_str)
//---- DEBUG ----
// txt_w , txt_h := bmp.draw_text(tmp_str)
// println("printing [${x},${y}] => '${tmp_str}' space_cw: $bmp.space_cw")
// bmp.box(x + left_offset,y + y_base - int((bmp.tf.y_min)*bmp.scale), x + txt_w + left_offset, y + y_base - int((bmp.tf.y_max) * bmp.scale), u32(0x00ff_0000) )
//---------------
y += y_base
txt1 = txt1[c..]
c = txt1.len
//---- DEBUG ----
// txt2 := txt1.join(' ')
// println("new string: ${txt2} len: ${c}")
//---------------
} else {
c--
}
}
}
}
bmp.space_cw = old_space_cw
}
|
