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,mut h := 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: ${tmp_str}") if tmp_str.len < 1 { break } bmp.space_cw = old_space_cw w,h = bmp.get_bbox(tmp_str) if w <= block.w { mut left_offset := int((block.w - w) * offset_flag) if bmp.justify && (f32(w) / f32(block.w)) >= bmp.justify_fill_ratio { //println("cut phase!") bmp.space_cw = 0.0 w,h = bmp.get_bbox(tmp_str) left_offset = int((block.w - w) * offset_flag) bmp.space_cw = bmp.get_justify_space_cw(tmp_str, w, block.w, space_cw) } else { bmp.space_cw = old_space_cw } bmp.set_pos(x + left_offset, y + y_base) bmp.draw_text(tmp_str) //---- DEBUG ---- //txt_w , txt_h := bmp.draw_text(tmp_str) //println("printing [${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 }