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