logo
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
//! A target for embedded-graphics drawing operations.

mod clipped;
mod color_converted;
mod cropped;
mod translated;

use crate::{geometry::Point, pixelcolor::PixelColor, primitives::Rectangle};

pub use clipped::Clipped;
pub use color_converted::ColorConverted;
pub use cropped::Cropped;
pub use translated::Translated;

pub use embedded_graphics_core::draw_target::DrawTarget;

/// Extension trait for `DrawTarget`s.
pub trait DrawTargetExt: DrawTarget + Sized {
    /// Creates a translated draw target based on this draw target.
    ///
    /// All drawing operations are translated by `offset` pixels, before being passed to the parent
    /// draw target.
    ///
    /// # Examples
    ///
    /// ```
    /// use embedded_graphics::{
    ///     mock_display::MockDisplay,
    ///     mono_font::{ascii::FONT_6X9, MonoTextStyle},
    ///     pixelcolor::BinaryColor,
    ///     prelude::*,
    ///     text::Text,
    /// };
    ///
    /// let mut display = MockDisplay::new();
    /// let mut translated_display = display.translated(Point::new(5, 10));
    ///
    /// let style = MonoTextStyle::new(&FONT_6X9, BinaryColor::On);
    ///
    /// // Draws text at position (5, 10) in the display coordinate system
    /// Text::new("Text", Point::zero(), style).draw(&mut translated_display)?;
    /// #
    /// # let mut expected = MockDisplay::new();
    /// #
    /// # Text::new("Text", Point::new(5, 10), style).draw(&mut expected)?;
    /// #
    /// # display.assert_eq(&expected);
    /// #
    /// # Ok::<(), core::convert::Infallible>(())
    /// ```
    fn translated(&mut self, offset: Point) -> Translated<'_, Self>;

    /// Creates a cropped draw target based on this draw target.
    ///
    /// A cropped draw target is a draw target for a rectangular subregion of the parent draw target.
    /// Its coordinate system is shifted so that the origin coincides with `area.top_left` in the
    /// parent draw target's coordinate system.
    ///
    /// The bounding box of the returned target will always be contained inside the bounding box
    /// of the parent target. If any of the requested `area` lies outside the parent target's bounding
    /// box the intersection of the parent target's bounding box and `area` will be used.
    ///
    /// Drawing operations outside the bounding box will not be clipped.
    ///
    /// # Examples
    ///
    /// ```
    /// use embedded_graphics::{
    ///     mock_display::MockDisplay,
    ///     mono_font::{ascii::FONT_6X9, MonoTextStyle},
    ///     pixelcolor::Rgb565,
    ///     prelude::*,
    ///     primitives::Rectangle,
    ///     text::{Text, Alignment, Baseline, TextStyleBuilder},
    /// };
    ///
    /// /// Fills a draw target with a blue background and prints centered yellow text.
    /// fn draw_text<T>(target: &mut T, text: &str) -> Result<(), T::Error>
    /// where
    ///     T: DrawTarget<Color = Rgb565>,
    /// {
    ///     target.clear(Rgb565::BLUE)?;
    ///
    ///     let text_position = target.bounding_box().center();
    ///
    ///     let character_style = MonoTextStyle::new(&FONT_6X9, Rgb565::YELLOW);
    ///     let text_style = TextStyleBuilder::new()
    ///         .alignment(Alignment::Center)
    ///         .baseline(Baseline::Middle)
    ///         .build();
    ///
    ///     Text::with_text_style(text, text_position, character_style, text_style).draw(target)?;
    ///
    ///     Ok(())
    /// }
    ///
    /// let mut display = MockDisplay::new();
    /// display.set_allow_overdraw(true);
    ///
    /// let area = Rectangle::new(Point::new(5, 10), Size::new(40, 15));
    /// let mut cropped_display = display.cropped(&area);
    ///
    /// draw_text(&mut cropped_display, "Text")?;
    /// #
    /// # Ok::<(), core::convert::Infallible>(())
    /// ```
    fn cropped(&mut self, area: &Rectangle) -> Cropped<'_, Self>;

    /// Creates a clipped draw target based on this draw target.
    ///
    /// A clipped draw target is a draw target for a rectangular subregion of the parent draw target.
    /// The coordinate system of the created draw target is equal to the parent target's coordinate
    /// system. All drawing operations outside the bounding box will be clipped.
    ///
    /// The bounding box of the returned target will always be contained inside the bounding box
    /// of the parent target. If any of the requested `area` lies outside the parent target's bounding
    /// box the intersection of the parent target's bounding box and `area` will be used.
    ///
    /// # Examples
    ///
    /// ```
    /// use embedded_graphics::{
    ///     mock_display::MockDisplay,
    ///     mono_font::{ascii::FONT_10X20, MonoTextStyle},
    ///     pixelcolor::BinaryColor,
    ///     prelude::*,
    ///     primitives::Rectangle,
    ///     text::Text,
    /// };
    ///
    /// let mut display = MockDisplay::new();
    ///
    /// let area = Rectangle::new(Point::zero(), Size::new(4 * 10, 20));
    /// let mut clipped_display = display.clipped(&area);
    ///
    /// let style = MonoTextStyle::new(&FONT_10X20, BinaryColor::On);
    ///
    /// // Only the first 4 characters will be drawn, because the others are outside
    /// // the clipping area
    /// Text::new("Clipped", Point::new(0, 15), style).draw(&mut clipped_display)?;
    /// #
    /// # let mut expected = MockDisplay::new();
    /// #
    /// # Text::new("Clip", Point::new(0, 15), style).draw(&mut expected)?;
    /// #
    /// # display.assert_eq(&expected);
    /// #
    /// # Ok::<(), core::convert::Infallible>(())
    /// ```
    fn clipped(&mut self, area: &Rectangle) -> Clipped<'_, Self>;

    /// Creates a color conversion draw target.
    ///
    /// A color conversion draw target is used to draw drawables with a different color type to a
    /// draw target. The drawable color type must implement `Into<C>`, where `C` is the draw
    /// target color type.
    ///
    /// # Performance
    ///
    /// Color conversion can be expensive on embedded hardware and should be avoided if possible.
    /// Using the same color type for drawables and the draw target makes sure that no unnecessary
    /// color conversion is used. But in some cases color conversion will be required, for example,
    /// to draw images with a color format only known at runtime.
    ///
    /// # Examples
    ///
    /// This example draws a `BinaryColor` image to an `Rgb888` display.
    ///
    /// ```
    /// use embedded_graphics::{
    ///     image::{Image, ImageRaw},
    ///     mock_display::MockDisplay,
    ///     pixelcolor::{BinaryColor, Rgb888},
    ///     prelude::*,
    /// };
    ///
    /// /// The image data.
    /// const DATA: &[u8] = &[
    ///     0b11110000, //
    ///     0b10010000, //
    ///     0b10010000, //
    ///     0b11110000, //
    /// ];
    ///
    /// // Create a `BinaryColor` image from the image data.
    /// let raw_image = ImageRaw::<BinaryColor>::new(DATA, 4);
    /// let image = Image::new(&raw_image, Point::zero());
    ///
    /// // Create a `Rgb888` display.
    /// let mut display = MockDisplay::<Rgb888>::new();
    ///
    /// // The image can't directly be drawn to the draw target because they use different
    /// // color type. This will fail to compile:
    /// // image.draw(&mut display)?;
    ///
    /// // To fix this `color_converted` is added to enable color conversion.
    /// image.draw(&mut display.color_converted())?;
    /// #
    /// # let mut expected = MockDisplay::from_pattern(&[
    /// #     "WWWW", //
    /// #     "WKKW", //
    /// #     "WKKW", //
    /// #     "WWWW", //
    /// # ]);
    /// #
    /// # display.assert_eq(&expected);
    /// #
    /// # Ok::<(), core::convert::Infallible>(())
    /// ```
    fn color_converted<C>(&mut self) -> ColorConverted<'_, Self, C>
    where
        C: PixelColor + Into<Self::Color>;
}

impl<T> DrawTargetExt for T
where
    T: DrawTarget,
{
    fn translated(&mut self, offset: Point) -> Translated<'_, Self> {
        Translated::new(self, offset)
    }

    fn cropped(&mut self, area: &Rectangle) -> Cropped<'_, Self> {
        Cropped::new(self, area)
    }

    fn clipped(&mut self, area: &Rectangle) -> Clipped<'_, Self> {
        Clipped::new(self, area)
    }

    fn color_converted<C>(&mut self) -> ColorConverted<'_, Self, C>
    where
        C: PixelColor + Into<Self::Color>,
    {
        ColorConverted::new(self)
    }
}

#[cfg(test)]
mod tests {
    use crate::{
        draw_target::{DrawTarget, DrawTargetExt},
        geometry::{Dimensions, Point, Size},
        mock_display::MockDisplay,
        pixelcolor::BinaryColor,
        primitives::{Primitive, PrimitiveStyle, Rectangle},
        Drawable, Pixel,
    };

    #[test]
    fn draw_iter() {
        let mut display = MockDisplay::new();

        let area = Rectangle::new(Point::new(2, 1), Size::new(2, 4));
        let mut clipped = display.clipped(&area);

        let pixels = [
            Pixel(Point::new(0, 1), BinaryColor::On),
            Pixel(Point::new(1, 1), BinaryColor::On),
            Pixel(Point::new(2, 1), BinaryColor::On),
            Pixel(Point::new(3, 1), BinaryColor::On),
            Pixel(Point::new(4, 1), BinaryColor::On),
            Pixel(Point::new(2, 0), BinaryColor::Off),
            Pixel(Point::new(2, 2), BinaryColor::Off),
            Pixel(Point::new(2, 3), BinaryColor::Off),
            Pixel(Point::new(2, 4), BinaryColor::Off),
            Pixel(Point::new(2, 5), BinaryColor::Off),
        ];
        clipped.draw_iter(pixels.iter().copied()).unwrap();

        display.assert_pattern(&[
            "    ", //
            "  ##", //
            "  . ", //
            "  . ", //
            "  . ", //
        ]);
    }

    #[test]
    fn fill_contiguous() {
        let mut display = MockDisplay::new();

        let area = Rectangle::new(Point::new(3, 2), Size::new(2, 3));
        let mut clipped = display.clipped(&area);

        let colors = [
            1, 1, 1, 1, 1, //
            0, 0, 0, 0, 1, //
            0, 1, 0, 1, 1, //
            1, 0, 1, 0, 1, //
        ];
        let area = Rectangle::new(Point::new(1, 2), Size::new(5, 4));
        clipped
            .fill_contiguous(&area, colors.iter().map(|c| BinaryColor::from(*c != 0)))
            .unwrap();

        display.assert_pattern(&[
            "     ", //
            "     ", //
            "   ##", //
            "   ..", //
            "   .#", //
        ]);
    }

    #[test]
    fn fill_solid() {
        let mut display = MockDisplay::new();

        let area = Rectangle::new(Point::new(3, 2), Size::new(4, 2));
        let mut clipped = display.clipped(&area);

        let area = Rectangle::new(Point::new(2, 1), Size::new(6, 4));
        clipped.fill_solid(&area, BinaryColor::On).unwrap();

        display.assert_pattern(&[
            "       ", //
            "       ", //
            "   ####", //
            "   ####", //
        ]);
    }

    #[test]
    fn clear() {
        let mut display = MockDisplay::new();

        let area = Rectangle::new(Point::new(1, 3), Size::new(3, 4));
        let mut clipped = display.clipped(&area);
        clipped.clear(BinaryColor::On).unwrap();

        let mut expected = MockDisplay::new();
        area.into_styled(PrimitiveStyle::with_fill(BinaryColor::On))
            .draw(&mut expected)
            .unwrap();

        display.assert_eq(&expected);
    }

    #[test]
    fn bounding_box() {
        let mut display: MockDisplay<BinaryColor> = MockDisplay::new();

        let area = Rectangle::new(Point::new(1, 3), Size::new(2, 4));
        let clipped = display.clipped(&area);

        assert_eq!(clipped.bounding_box(), area);
    }

    #[test]
    fn bounding_box_is_clipped() {
        let mut display: MockDisplay<BinaryColor> = MockDisplay::new();
        let display_bb = display.bounding_box();

        let top_left = Point::new(10, 20);
        let size = Size::new(1000, 1000);
        let area = Rectangle::new(top_left, size);
        let clipped = display.clipped(&area);

        let expected_size = display_bb.size - Size::new(top_left.x as u32, top_left.y as u32);

        assert_eq!(
            clipped.bounding_box(),
            Rectangle::new(top_left, expected_size),
        );
    }
}