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Diffstat (limited to 'samplecode/SampleTextOnPath.cpp')
| -rw-r--r-- | samplecode/SampleTextOnPath.cpp | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/samplecode/SampleTextOnPath.cpp b/samplecode/SampleTextOnPath.cpp new file mode 100644 index 0000000..96e8c9a --- /dev/null +++ b/samplecode/SampleTextOnPath.cpp @@ -0,0 +1,284 @@ +#include "SampleCode.h" +#include "SkView.h" +#include "SkCanvas.h" +#include "SkGradientShader.h" +#include "SkGraphics.h" +#include "SkImageDecoder.h" +#include "SkPackBits.h" +#include "SkPath.h" +#include "SkPathMeasure.h" +#include "SkRandom.h" +#include "SkRegion.h" +#include "SkShader.h" +#include "SkUtils.h" +#include "SkColorPriv.h" +#include "SkColorFilter.h" +#include "SkTypeface.h" +#include "SkAvoidXfermode.h" + +#define REPEAT_COUNT 0 + +static const char gText[] = "Hamburgefons"; + +static bool gDevKern; + +static void rand_text(char text[], SkRandom& rand, size_t count) { + for (size_t i = 0; i < count; i++) { + text[i] = rand.nextU() & 0x7F; + } +} + +static SkScalar sum_widths(const SkScalar widths[], int count) { + SkScalar w = 0; + for (int i = 0; i < count; i++) { + w += widths[i]; + } + return w; +} + +static void test_measure(const SkPaint& paint) { + char text[256]; + SkScalar widths[256]; + SkRect rects[256]; + SkRect bounds; + int count = 256; + + SkRandom rand; + + for (int i = 0; i < 100; i++) { + rand_text(text, rand, 256); + paint.getTextWidths(text, count, widths, NULL); + SkDEBUGCODE(SkScalar tw0 = sum_widths(widths, count);) + paint.getTextWidths(text, count, widths, rects); + SkDEBUGCODE(SkScalar tw1 = sum_widths(widths, count);) + SkASSERT(tw0 == tw1); + + SkDEBUGCODE(SkScalar w0 = paint.measureText(text, count, NULL);) + SkDEBUGCODE(SkScalar w1 = paint.measureText(text, count, &bounds);) + SkASSERT(w0 == w1); + SkASSERT(w0 == tw0); + + SkRect r = rects[0]; + SkScalar x = 0; + for (int j = 1; j < count; j++) { + x += widths[j-1]; + rects[j].offset(x, 0); + r.join(rects[j]); + } + SkASSERT(r == bounds); + + if (r != bounds) { + printf("flags=%x i=%d [%g %g %g %g] [%g %g %g %g]\n", + paint.getFlags(), i, + SkScalarToFloat(r.fLeft), + SkScalarToFloat(r.fTop), + SkScalarToFloat(r.fRight), + SkScalarToFloat(r.fBottom), + SkScalarToFloat(bounds.fLeft), + SkScalarToFloat(bounds.fTop), + SkScalarToFloat(bounds.fRight), + SkScalarToFloat(bounds.fBottom)); + } + } +} + +static void test_measure() { + SkPaint paint; + + for (int i = 0; i <= SkPaint::kAllFlags; i++) { + paint.setFlags(i); + test_measure(paint); + } +} + +////////////////////////////////////////////////////////////////////////////// + +static void test_textBounds(SkCanvas* canvas) { +// canvas->scale(SK_Scalar1/2, SK_Scalar1/2); + +// canvas->rotate(SkIntToScalar(30)); + + gDevKern = !gDevKern; + + SkScalar x = SkIntToScalar(50); + SkScalar y = SkIntToScalar(150); + SkScalar w[100]; + SkRect r[100], bounds; + + SkPaint paint; + paint.setTextSize(SkIntToScalar(64)); + paint.setAntiAlias(true); + paint.setDevKernText(gDevKern); + + (void)paint.measureText(gText, strlen(gText), &bounds, NULL); + paint.setColor(SK_ColorGREEN); + bounds.offset(x, y); + canvas->drawRect(bounds, paint); + + int count = paint.getTextWidths(gText, strlen(gText), w, r); + + paint.setColor(SK_ColorRED); + for (int i = 0; i < count; i++) { + r[i].offset(x, y); + canvas->drawRect(r[i], paint); + x += w[i]; + } + x = SkIntToScalar(50); + paint.setColor(gDevKern ? SK_ColorDKGRAY : SK_ColorBLACK); + canvas->drawText(gText, strlen(gText), x, y, paint); +} + +static void create_src(SkBitmap* bitmap, SkBitmap::Config config) { + bitmap->setConfig(config, 100, 100); + bitmap->allocPixels(); + bitmap->eraseColor(0); + + SkCanvas canvas(*bitmap); + SkPaint paint; + + paint.setAntiAlias(true); + canvas.drawCircle(SkIntToScalar(50), SkIntToScalar(50), + SkIntToScalar(50), paint); +} + +static void blur(SkBitmap* dst, const SkBitmap& src, SkScalar radius) { + *dst = src; +} + +static void test_bitmap_blur(SkCanvas* canvas) { + SkBitmap src, dst; + + create_src(&src, SkBitmap::kARGB_8888_Config); + blur(&dst, src, SkIntToScalar(4)); + + SkPaint paint; + + paint.setColor(SK_ColorRED); + + canvas->drawBitmap(dst, SkIntToScalar(30), SkIntToScalar(60), &paint); +} + +static SkScalar getpathlen(const SkPath& path) { + SkPathMeasure meas(path, false); + return meas.getLength(); +} + +static void test_textpathmatrix(SkCanvas* canvas) { + SkPaint paint; + SkPath path; + SkMatrix matrix; + + path.moveTo(SkIntToScalar(200), SkIntToScalar(300)); + path.quadTo(SkIntToScalar(400), SkIntToScalar(100), + SkIntToScalar(600), SkIntToScalar(300)); + + paint.setAntiAlias(true); + + paint.setStyle(SkPaint::kStroke_Style); + // canvas->drawPath(path, paint); + paint.setStyle(SkPaint::kFill_Style); + paint.setTextSize(SkIntToScalar(48)); + paint.setTextAlign(SkPaint::kRight_Align); + + const char* text = "Reflection"; + size_t len = strlen(text); + SkScalar pathLen = getpathlen(path); + + canvas->drawTextOnPath(text, len, path, NULL, paint); + + paint.setColor(SK_ColorRED); + matrix.setScale(-SK_Scalar1, SK_Scalar1); + matrix.postTranslate(pathLen, 0); + canvas->drawTextOnPath(text, len, path, &matrix, paint); + + paint.setColor(SK_ColorBLUE); + matrix.setScale(SK_Scalar1, -SK_Scalar1); + canvas->drawTextOnPath(text, len, path, &matrix, paint); + + paint.setColor(SK_ColorGREEN); + matrix.setScale(-SK_Scalar1, -SK_Scalar1); + matrix.postTranslate(pathLen, 0); + canvas->drawTextOnPath(text, len, path, &matrix, paint); +} + +class TextOnPathView : public SampleView { +public: + SkPath fPath; + SkScalar fHOffset; + + TextOnPathView() { + SkRect r; + r.set(SkIntToScalar(100), SkIntToScalar(100), + SkIntToScalar(300), SkIntToScalar(300)); + fPath.addOval(r); + fPath.offset(SkIntToScalar(200), 0); + + fHOffset = SkIntToScalar(50); + } + +protected: + // overrides from SkEventSink + virtual bool onQuery(SkEvent* evt) { + if (SampleCode::TitleQ(*evt)) { + SampleCode::TitleR(evt, "Text On Path"); + return true; + } + return this->INHERITED::onQuery(evt); + } + + virtual void onDrawContent(SkCanvas* canvas) { + SkPaint paint; + + paint.setAntiAlias(true); + paint.setTextSize(SkIntToScalar(50)); + + for (int j = 0; j < REPEAT_COUNT; j++) { + SkScalar x = fHOffset; + + paint.setColor(SK_ColorBLACK); + canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath, + x, paint.getTextSize()/2, paint); + + paint.setColor(SK_ColorRED); + canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath, + x + SkIntToScalar(50), 0, paint); + + paint.setColor(SK_ColorBLUE); + canvas->drawTextOnPathHV(gText, sizeof(gText)-1, fPath, + x + SkIntToScalar(100), -paint.getTextSize()/2, paint); + } + + paint.setColor(SK_ColorGREEN); + paint.setStyle(SkPaint::kStroke_Style); +// canvas->drawPath(fPath, paint); + + canvas->translate(0, SkIntToScalar(100)); + test_textpathmatrix(canvas); + + if (REPEAT_COUNT > 1) + this->inval(NULL); + } + + virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { + fHints += 1; + this->inval(NULL); + return this->INHERITED::onFindClickHandler(x, y); + } + + virtual bool onClick(Click* click) { + return this->INHERITED::onClick(click); + } + +private: + int fHints; + typedef SampleView INHERITED; +}; + +////////////////////////////////////////////////////////////////////////////// + +static SkView* MyFactory() { + return new TextOnPathView; +} + +static SkViewRegister reg(MyFactory); + |