diff options
Diffstat (limited to 'v_windows/v/vlib/x/ttf/text_block.v')
| -rw-r--r-- | v_windows/v/vlib/x/ttf/text_block.v | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/v_windows/v/vlib/x/ttf/text_block.v b/v_windows/v/vlib/x/ttf/text_block.v new file mode 100644 index 0000000..58e909d --- /dev/null +++ b/v_windows/v/vlib/x/ttf/text_block.v @@ -0,0 +1,120 @@ +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 +} |