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comparison oscilloscope.c @ 2275:e27ab5f4bfe3

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Fix off by one in oscilloscope rendering
author Michael Pavone <pavone@retrodev.com>
date Mon, 02 Jan 2023 11:36:16 -0800
parents d220305e81b9
children d30ea441b92e
comparison
equal deleted inserted replaced
2274:bf1bb893f104 2275:e27ab5f4bfe3
82 { 82 {
83 //TODO: bresenham 83 //TODO: bresenham
84 //TODO: at least linear filtering 84 //TODO: at least linear filtering
85 int16_t sample = scope->channels[i].samples[(int)(cur_sample + 0.5f)]; 85 int16_t sample = scope->channels[i].samples[(int)(cur_sample + 0.5f)];
86 int y = (float)sample * value_scale + 0.5f; 86 int y = (float)sample * value_scale + 0.5f;
87 if (y > row_height / 2) { 87 if (y > row_height / 2 - 1) {
88 y = row_height / 2; 88 y = row_height / 2 - 1;
89 } else if (y < -(row_height / 2)) { 89 } else if (y < -(row_height / 2)) {
90 y = -(row_height / 2); 90 y = -(row_height / 2);
91 } 91 }
92 y += row_height / 2; 92 y += row_height / 2;
93 if (last_y >= 0) { 93 if (last_y >= 0) {
104 cur_sample += samples_per_pixel; 104 cur_sample += samples_per_pixel;
105 if (cur_sample + 0.5f >= scope->channels[i].period) { 105 if (cur_sample + 0.5f >= scope->channels[i].period) {
106 cur_sample -= scope->channels[i].period; 106 cur_sample -= scope->channels[i].period;
107 } 107 }
108 } 108 }
109 109
110 offset += column_width; 110 offset += column_width;
111 if (offset >= width) { 111 if (offset >= width) {
112 offset = 0; 112 offset = 0;
113 cur_line += pitch * row_height; 113 cur_line += pitch * row_height;
114 } 114 }
115 } 115 }
116 116
117 117
118 render_framebuffer_updated(scope->window, WIDTH); 118 render_framebuffer_updated(scope->window, WIDTH);
119 } 119 }
120 120
121 void scope_close(oscilloscope *scope) 121 void scope_close(oscilloscope *scope)
122 { 122 {